Research Article |
Corresponding author: Werner Conradie ( werner@bayworld.co.za ) Academic editor: Johannes Penner
© 2021 William R. Branch, Andreas Schmitz, Javier Lobón-Rovira, Ninda L. Baptista, Telmo António, Werner Conradie.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Branch WR, Schmitz A, Lobón-Rovira J, Baptista NL, António T, Conradie W (2021) Rock island melody: A revision of the Afroedura bogerti Loveridge, 1944 group, with descriptions of four new endemic species from Angola. Zoosystematics and Evolution 97(1): 55-82. https://doi.org/10.3897/zse.97.57202
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Four new species of flat geckos in the Afroedura bogerti Loveridge, 1944 group are described from south-western and west-central Angola. The description of these new species significantly restricts the distribution range of typical A. bogerti, a morphologically very similar species, from which they differ genetically by 5.9–12% divergence for the mitochondrial 16S ribosomal RNA gene. Morphologically and genetically, Angolan Afroedura are divided into two main groups: a mostly south-western coastal group and a west-central inland/highland group. These two groups are further divisible into three and two subgroups respectively, all geographically isolated, differing by a combination of the following features: colouration, average adult size, number of mid-body scale rows, number of scale rows on dorsal and ventral surface of each tail verticil and if nostril scales are in contact or not. All five Angolan species are morphologically distinguishable and in agreement with the molecular results. An updated dichotomous key to the Afroedura transvaalica group is provided. The new discovery adds to a growing number of endemic Pro-Namib reptiles described from Angola in recent years.
Aqui são descritas quatro novas espécies de osga-achatada, do grupo Afroedura Loveridge, 1944, do sudoeste e centro-oeste de Angola. A descrição destas novas espécies reduziu significativamente a área de distribuição da A. bogerti típica, uma espécie uma espécie morfologicamente muito semelhante às primeiras, da qual estas têm entre 5.9 e 12% de diferença genética para o gene mitocondrial 16S rRNA. Do ponto de vista morfológico e genético, as Afroedura de Angola dividem-se em dois grupos principais: o do sudoeste, maioritariamente das planícies costeiras e do norte, e o do planalto interior. Estes grupos podem ainda ser divididos em dois e três subgrupos, respectivamente, todos isolados geograficamente, e estes diferem entre si na combinação das seguintes características: coloração, tamanho médio dos adultos, número de fileiras de escamas na secção mediana do corpo, número de escamas dorsais e ventrais por cada anel caudal de escamas, escamas nasais em contacto ou não. É possível distinguir morfologicamente as cinco espécies de Angola, de forma concordante com os resultados da genética. Aqui apresentamos uma chave dicotómica actualizada para o grupo Afroedura transvaalica. Esta nova descoberta junta-se ao crescente número de répteis endémicos do Pro-Namibe descritos em Angola nos últimos anos.
Biodiversity hotspot, cryptic species, endemism, Gekkonidae, Reptilia
Еndemismo, espécies crípticas, Gekkonidae, hotspot de biodiversidade, Reptilia
The current reptile diversity in Angola comprises about 300 species (
The Gekkonidae in Angola comprises eight genera, Afroedura (one species), Afrogecko (one species), Chondrodactylus (three species), Hemidactylus (eight species), Kolekanos (one species), Lygodactylus (five species), Pachydactylus (11 species) and Rhoptropus (seven species) (see
Up to now, Afroedura bogerti was the only species of flat gecko known from Angola (
For the last decade (2009–2019), material of Afroedura bogerti was collected from south-western and west-central Angola (Fig.
Digital elevation map showing the predicted distribution of the five newly-recognised species of Afroedura occurring in Angola (data for A. wulfhaackei sp. nov. also contain the morphologically-indistinguishable Afroedura sp. 5–7 clades). Confirmed locality records are indicated by solid circles, with type localities indicated by stars. Coloured polygons indicate potential distribution areas with more than 90% of climatic habitat suitability.
We used molecular methods to support the identified morphological groupings. Recent studies on the genus Afroedura (e.g.
Afroedura specimens (field and museum numbers), generalised localities (see systematic accounts for full details) and GenBank accession numbers of vouchers used in this study.
Species | Locality | Sample Number | Museum Number | GenBank Number |
---|---|---|---|---|
A. donveae sp. nov. | Omauha Lodge | KTH09-196 |
|
LM993776 |
KTH09-197 |
|
LM993777 | ||
P9-284 | NA | MW354008 | ||
P9-285 | NA | MW354009 | ||
A. praedicta sp. nov. | Serra da Neve | NB 853 |
|
MW354010 |
NB 854 | ISCED-NB 854 | MW354011 | ||
NB 855 | ISCED-NB 855 | MW354012 | ||
A. vazpintorum sp. nov. | 50 km east Namibe on main tar road to Leba | ANG 289 |
|
MF565454 |
Meva Beach | “30” |
|
MF565455 | |
10.4 km south of Rio Mucungo on tar road to Bentiaba | samp 57/E260.13 |
|
MF565458 | |
samp 58/E260.14 |
|
MF565457 | ||
samp 39/E260.12 | NA | MF565459 | ||
1 km east of Farm Mucungo | AG 137 |
|
MF565460 | |
AG 138 |
|
MF565463 | ||
AG 141 |
|
MF565462 | ||
20 km south Bentiaba | samp 62/E260.15 |
|
MF565456 | |
52 km north on tar road on road to Lucira | ANG 311 |
|
MF565461 | |
Mariquita | P9-154 | NA | MW354018 | |
approx. 18 km E Lucira | NB 834 | ISCED-NB 834 | MW354019 | |
NB 835 | ISCED-NB 835 | MW354020 | ||
Carivo | P8-20 | NA | MW354016 | |
P8-19 | NA | MW354015 | ||
Bimbe, Estação Zootecnica | NB 743 | ISCED-NB 743 | MW354017 | |
NB 745 | ISCED-NB 745 | MW354013 | ||
NB 746 | ISCED-NB 746 | MW354014 | ||
A. bogerti | Farm Namba | samp 23/E260.1 |
|
MF565467 |
samp 24/E260.2 |
|
MF565468 | ||
samp 25/E260.3 |
|
MF565466 | ||
400 m north of Mission de Namba grounds | samp 27/E260.4 |
|
MF565465 | |
samp 28/E260.5 | NA | MF565464 | ||
Namba | JLRZC0015 | NA | MW354021 | |
JLRZC0016 | NA | MW354022 | ||
A. wulfhaackei sp. nov. | 5 km west of Maka-Mombolo | samp 71/E260.17 |
|
MF565477 |
samp 72/E260.18 |
|
MF565478 | ||
samp 73/E260.19 |
|
MF565479 | ||
Maka-Mombolo, north-east of Balombo | samp 70/E260.16 |
|
MF565476 | |
Morro do Moco, camp near Canjonde | NB 817 | ISCED-NB 817 | MW354024 | |
NB 818 | ISCED-NB 818 | MW354025 | ||
NB 819 | ISCED-NB 819 | MW354026 | ||
A. sp. 5 | Farm Victoria-Verdun, 2 km S of Mt. Sandula | samp 33/E260.8 |
|
MF565471 |
samp 34/E260.9 |
|
MF565469 | ||
samp 31/E260.6 | NA | MF565470 | ||
Sandula | P9-141 | NA | MW354023 | |
A. sp. 6 | 5 km southwest of Lepi | samp 37/E260.11 |
|
MF565472 |
A. sp. 7 | Candumbo Rocks Memorial | samp 35/E260.10 |
|
MF565473 |
WC-4037 |
|
MF565474 | ||
WC-4038 |
|
MF565475 |
DNA sequences were aligned using the original chromatograph data in the programme BioEdit (
Bootstrap analyses (BS) with 1000 pseudoreplicates were used to evaluate relative branch support in the ML analysis. We regarded tree topologies with bootstrap values of 70% or greater as supported (Huelsenbeck and Hillis 1993). Bayesian analyses were run for 10 million generations using four chains, sampling every 1000 generations, with the first 25% of trees discarded as burn-in. Stationarity, convergence and mixing of the parameters (ESS values) for the Bayes runs were checked in Tracer v.1.7.1 (
Summary of intra- and interclade uncorrected pairwise genetic distances for specimens of Afroedura clades compared to A. loveridgei for 16S rRNA. Intraclade/intraspecific distances are marked in bold.
Species/Clade | Intraclade distances | Interclade/interspecific distances | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
A. loveridgei | A. donveae sp. nov. | A. praedicta sp. nov. | A. vazpintorum sp. nov. | A. bogerti sensu stricto | A. sp. 5 | A. sp. 6 | A. sp. 7 | A. wulfhaackei sp. nov. | ||
A. loveridgei | – | – | ||||||||
A. donveae sp. nov. | 0.0015 | 0.1987 | – | |||||||
A. praedicta sp. nov. | 0.0077 | 0.1827 | 0.0654 | – | ||||||
A. vazpintorum sp. nov. | 0.0217 | 0.1890 | 0.0897 | 0.0870 | – | |||||
A. bogerti sensu stricto | 0.0015 | 0.1757 | 0.1083 | 0.0908 | 0.1124 | – | ||||
A. sp. 5 | 0.0000 | 0.1588 | 0.1021 | 0.0988 | 0.1071 | 0.0634 | – | |||
A. sp. 6 | - | 0.1667 | 0.1037 | 0.0976 | 0.1074 | 0.0650 | 0.0353 | – | ||
A. sp. 7 | 0.0017 | 0.1478 | 0.1041 | 0.0953 | 0.1201 | 0.0722 | 0.0422 | 0.0378 | – | |
A. wulfhaackei sp. nov. | 0.0033 | 0.1518 | 0.0957 | 0.0893 | 0.1081 | 0.0592 | 0.0399 | 0.0327 | 0.0376 | – |
We examined material in the collections of the Port Elizabeth Museum (
As with many other gecko genera, Afroedura is morphologically conservative, with few discrete differences. The following characters (detailed in
The following measurements were taken in millimetres (mm) using a digital calliper (accuracy of 0.1 mm) with the aid of a Nikon SMZ1270 dissecting microscope: 1) snout-vent length (SVL – from the tip of the snout to the cloaca with the gecko flattened on its back), 2) tail length (TL, only original tails were measured); 3) head length (HL – tip of snout to retroarticular process of jaw); 4) head width (HW – widest point of head, approximately at the level of eyes); 5) snout length (SL – tip of snout to front of orbit); 6) eye diameter (ED –measured in horizontal orientation); 7) ear to eye length (EE – top edge of earhole to back of eye); 8) ear opening (EO – greatest length); and 9) internostril distance (IN – shortest distance between nostrils). All head measurements were taken on the right side of the head.
Measurements and scale counts were carried out mostly by WRB and WC incorporated newly-collected material to supplement the final dataset. Only adult material was used for additional comparative morphological analysis. Specimens were considered adult (sexually mature) at SVL > 38 mm (following
In order to identify potential distribution areas for Angolan Afroedura, an bioclimatic niche model was conducted using Maxent (
Molecular analyses confirm that all Angolan Afroedura form a monophyletic clade, distinct from other members of the ‘transvaalica’ group (
Two sister clades occur exclusively in the coastal region (except for the first subclade, see below) with a third related clade (Afroedura sp. 2) occurring a little further inland in the Serra da Neve mountain range (Fig.
Five further, strongly supported, monophyletic clades occur above the Angolan escarpment and within the region of the putative type locality. The Namba population (here referred to as A. bogerti sensu stricto) is genetically well-differentiated from four southern highland clades (Afroedura sp. 4–7) and shows negligible internal genetic variation (> 0.15%, Table
Results for the morphological analysis are summarised in Table
Summary boxplots (top whisker – maximum value; lower whisker – minimum value; dark horizontal line – median; box – 1st and 3rd quartile) comparing morphological features amongst the four species of Afroedura separated by sex: Afroedura bogerti (dark green – Ab; n = 9), Afroedura wulfhaackei sp. nov. (including the morphologically-indistinguishable Afroedura sp. 5–7 clades; blue – Aw; n = 40), Afroedura praedicta sp. nov. (light green – Ap; n = 5), Afroedura donveae sp. nov. (red – Ad; n = 17), Afroedura vazpintorum sp. nov. (orange – Av; n = 48).
Summary of morphological data for Afroedura bogerti, A. wulfhaackei sp. nov. (including the members of the morphologically-indistinguishable Afroedura sp. 5–7 clades), A. donveae sp. nov., A. vazpintorum sp. nov. and A. praedicta sp. nov. Values are given as a range with mean values in parenthesis. M = male, F = female, n = sample size.
Character | A. bogerti (n = 9) | A. wulfhaackei sp. nov. (n = 40) | A. donveae sp. nov. (n = 17) | A. vazpintorum sp. nov. (n = 48) | A. praedicta sp. nov. (n = 5) |
---|---|---|---|---|---|
Snout vent length (max) | M 50 mm F 54 mm |
M 58 mm F 59 mm |
M 59 mm F 65 mm |
M 58 mm F 59 mm |
M 52 mm F 51 mm |
Head Length/Head Width | 1.3 ± 0.09 | 1.4 ± 0.14 | 1.3 ± 0.09 | 1.3 ± 0.13 | 1.3 ± 0.14 |
Snout Length/Eye Distance | 1.6 ± 0.34 | 1.9 ± 0.36 | 2.0 ± 0.19 | 1.8 ± 0.29 | 1.7 ± 0.19 |
Snout Length/Eye-Ear Distance | 1.2 ± 0.07 | 1.2 ± 0.16 | 1.3 ± 0.30 | 1.2 ± 0.17 | 1.1 ± 0.09 |
Precloacal pores (males) | 8 | 9–12 (9.7) | 11–12 (11.5) | 9–11 (10.2) | 8 (8.0) |
Ventral rows per tail verticil | 4 (4.0) | 4–5 (4.0) | 5–6 (5.5) | 5–7 (5.0) | 4 (4.0) |
Dorsal rows per tail verticil | 5 (5.0) | 5–6 (5.1) | 6–7 (6.6) | 6–7 (6.1) | 5 (5.0) |
Scales below 4th toe | 6–9 (6.9) | 6–9 (7.4) | 6–8 (7.7) | 6–10 (8.0) | 9–11 (9.6) |
Mid-body scale rows | 69–77 (73.5) | 76–88 (79.3) | 64–78 (72.8) | 73–86 (80.3) | 73–78 (74.8) |
Scales between eyes | 11–14 (12.4) | 11–16 (13.7) | 11–14 (11.0) | 11–15 (13.1) | 12–15 (13.5) |
Scales: nostril to eye | 8–12 (9.9) | 8–11 (8.5) | 8–11 (9.3) | 7–11 (9.1) | 9–10 (10.2) |
Scales: ear to eye | 14–16 (15.4) | 15–18 (16.0) | 11–14 (11.9) | 13–17 (15.6) | 13–16 (14.8) |
Anterior nasals in contact | 33% | 68% | 100% | 100% | 100% |
Suptalabials | 8–10 (8.4) | 8–11 (8.2) | 8–10 (9.0) | 8–10 (8.8) | 8–10 (9.2) |
Infralabials | 8–9 (8.3) | 8–9 (8.4) | 8–11 (9.3) | 8–9 (9.1) | 8–9 (8.5) |
Tukey multiple comparisons of means of the four species combinations of Angolan Afroedura (values for A. wulfhaackei sp. nov. include the members of the morphologically-indistinguishable Afroedura sp. 5–7 clades). Bold values indicate significant pairwise comparisons. SVL – snout-vent length; HL – head length; HW – head width; ED – eye-diameter; EE – ear-eye length; IN – internostril distance; MSR – mid-body scale rows.
Combinations | SVL | HL | HW | ED | EE | IN | Ventral verticil scale rows | Dorsal verticil scale rows | Preanal Pores | MSR |
---|---|---|---|---|---|---|---|---|---|---|
A. bogerti – A. donveae | P = 0.004 | P = 0.273 | P = 0.771 | P = 0.262 | P = 0.298 | P = 0.031 | P < 0.001 | P < 0.001 | P = 0.014 | P = 0.988 |
A. vazpintorum – A. donveae | P < 0.001 | P < 0.001 | P < 0.001 | P = 0.671 | P < 0.001 | P < 0.001 | P = 0.035 | P < 0.001 | P = 0.103 | P < 0.001 |
A. wulfhaackei – A. donveae | P < 0.001 | P = 0.264 | P = 0.004 | P = 0.642 | P < 0.001 | P < 0.001 | P < 0.001 | P < 0.000 | P = 0.012 | P < 0.001 |
A. praedicta – A. donveae | P = 0.015 | P = 0.396 | P = 0840 | P = 0.951 | P = 0.139 | P < 0.001 | P < 0.001 | P < 0.001 | P < 0.001 | P = 0.730 |
A. vazpintorum – A. bogerti | P = 0.932 | P = 0.927 | P = 0.424 | P = 0.026 | P = 0.992 | P = 1.000 | P < 0.001 | P < 0.001 | P = 0.168 | P < 0.001 |
A. wulfhaackei – A. bogerti | P = 0.942 | P = 0.926 | P = 0.767 | P = 0.020 | P = 1.000 | P = 0.868 | P =1.000 | P = 0.983 | P = 0.381 | P < 0.001 |
A. praedicta – A. bogerti | P = 1.000 | P = 1.000 | P = 1.000 | P = 0.187 | P = 1.000 | P = 0.993 | P = 1.000 | P = 1.000 | P = 1.000 | P = 0.956 |
A. wulfhaackei – A. vazpintorum | P = 1.000 | P = 0.066 | P = 0.839 | P = 1.000 | P = 0.769 | P = 0.312 | P < 0.001 | P < 0.001 | P = 0.676 | P = 0.647 |
A. praedicta – A. vazpintorum | P = 0.980 | P = 0.912 | P = 0.462 | P = 1.000 | P = 0.777 | P = 0.868 | P < 0.001 | P < 0.001 | P = 0.007 | P = 0.005 |
A. praedicta – A. wulfhaackei | P = 0.984 | P = 0.967 | P = 0.782 | P = 1.000 | P = 0.987 | P = 0.195 | P = 1.000 | P = 0.972 | P = 0.048 | P = 0.043 |
In summary, both genetics and morphology (particularly diagnostic features, such as the nasal condition [separated or in contact], colouration [ventral pigmentation], snout vent length, number of mid-body scale rows, number of pre-cloacal pores, number of dorsal and ventral scale rows per tail verticil), as well as geographical segregation, suggest that most of the major genetic clades recovered should be considered as separate species. We, therefore, take the opportunity here to provide an updated description for A. bogerti and describe the remaining clades as separate species. We apply the general lineage-based species concept, treating all populations that represent independent historical lineages supported by multiple different lines of evidence as listed above as separate species (
The Namba Flat Gecko, Afroedura bogerti was described using a single male specimen collected by Harry and Alan Chapman in 1925 during the Vernay Expedition to Angola (
Afroedura karroica bogerti –
AMNH 47841, adult male, collected from Namba (Mombolo) (approx. -11.91417, 14.82083, 1827 m a.s.l.), Cuanza-Sul Province, Angola, by Harry and Allan (= Alan) Chapman, between September and November 1925 during the Vernay Expedition to Angola.
Females:
JLRZC0015–6, collected from Namba (-11.88132, 14.76218, 1752 m a.s.l), Cuanza-Sul Province, Angola, by Pedro Vaz Pinto and Javier Lobón-Rovira on 11 February 2020.
(description based on the adult material listed above). Head and body dorsoventrally compressed; SVL 46.4–53.5 (mean 50.0) mm, HL 10.9–12.6 (mean 11.6) mm, HW 7.8–11.2 (mean 10.6) mm, broadest at posterior level of eye and 1.1–1.4 (mean 1.3) times longer than wide. Eyes large (2.1–4.3 [mean 2.8] mm wide), pupil vertical with indented margins; circumorbital scales small and smooth, elongate at upper anterior margins, upper posterior scales with small upward pointing spines. Snout rounded, 4.5–5.0 (mean 4.3) mm long, slightly longer than distance between eye and ear openings (3.6–4.3 [mean 3.6] mm). Scales on top of snout smooth, rounded, scales to the side larger than central ones, with no intervening minute granules. Scales on snout slightly subequal in size to those on back of head or nape. Scales on eyelids larger than those on the crown. Circumorbital scales are separated by a row of smaller scales from the large scales on eyelid. Nostril pierced between rostral, two to three nasal scales and the 1st supralabial; the supranasal being much larger than the subequal postnasals and being separated from each other by one to two smaller scales. Nostrils slightly elevated. Rostral roughly rectangular, but with its upper edges elongated due to extensions into the nostril. Supralabials 8–10 (mean 8.4). Infralabials 8–9 (mean 8.3). A total of 11–14 (mean 12.4) scales across the crown at level of front of eyes. A total of 14–16 (mean 15.4) scales from front of ear to back of eye. Mid-body scale rows 69–77 (mean 73.5). Original tail slightly dorsoventrally flattened and distinctly verticillate, with obvious lateral constrictions that are not that distinct to the tip of tail; each verticil comprising 5 imbricate rows of scales dorsally and 4 imbricate scale rows ventrally and with ventral scales approximately twice the size of those on the dorsal surface. Limbs well developed, hindlimbs slightly longer than forelimbs. All digits with a large pair of distal scansors, separated by a large, curved claw and followed after a large gap by a smaller pair of scansors; infero-median row of digital scales enlarged transversely, particularly towards the scansors, where the terminal scale adjoining the first pair of scansors may be medially constricted, swollen and scansor-like, enlarged subdigital lamellae on 4th toe 6–9 (mean 6.9). Precloacal pores 8.
In life (based on
(Fig.
Typical habitat of Angolan Afroedura. A. Namba area (A. bogerti); B. Mt Sandula (Afroedura sp. 5); C. Serra da Neve (A. praedicta sp. nov.); D. Omauha Lodge (A. donveae sp. nov.); E. Farm Mucungo (A. vazpintorum sp. nov.); F. Bimbe (A. vazpintorum sp. nov.). Photos: A. Javier Lobón-Rovira; B, D, E. William R. Branch; C. Pedro Vaz Pinto; F. Ninda L. Baptista.
This species complex was previously considered to be widespread in granite boulders throughout south-western Angola (
Live photos of Angolan flat geckos: A. Afroedura bogerti (
The phylogenetic analysis identified four well-defined clades (Afroedura sp. 4–7) within the southern inland/highland major clade (see Results). Our data show that this southern major clade clearly represents at least one undescribed species of Afroedura. Despite comparatively-low genetic distances between the four clades recovered (Table
Afroedura bogerti –
(not examined). NB 817–9, collected at Morro do Moco, camp near Canjonde (-12.42611, 15.14778, 1931 m a.s.l), Huambo Province, Angola, by Pedro Vaz Pinto on 13 November 2017 (genetic samples included in this study).
Afroedura sp. 5 (Males):
TM 45381, 45384–5, TM 45398, collected at Candumbo Rocks, about 25 km east of the city of Huambo (-12.73614, 15.97442, 1760 m a.s.l), Huambo Province, Angola, by Wulf Haacke on 11 May 1971 (placed in Afroedura sp. 7, based on same geographical area as genetically-assigned material); FKH 0239, collected at Monte Verde-Sandula (-12.17924, 15.03086, 2055 m a.s.l.), Cuanza-Sul Province, Angola, by Pedro Vaz Pinto on 29 May 2019 (genetic sample included in this study placed it in Afroedura sp. 5).
The new species is named in honour of Wulf Haacke, retired curator of the herpetology collection at the former Transvaal Museum (now Ditsong National Museum of Natural History). His herpetological expeditions to Angola in the early 1970s paved the way for this study and much of the material used in this study resulted from his expeditions. The name is constructed in the masculine singular genitive.
A member of the greater ‘transvaalica’ group in possessing two pairs of enlarged scansors per digit and a strongly verticillate and flattened tail (
Afroedura wulfhaackei sp. nov. differs from other members of the A. bogerti-group by a combination of the following characters (see Tables
Adult male; SVL 51.4 mm; tail 47.1 mm (full original tail), with a small mid-ventral incision for the removal of liver sample. Measurements and meristic characters of holotype presented in Table
Measurements (in mm) and scale counts for the type series of Afroedura wulfhaackei sp. nov.
Catalogue number |
|
|
|
---|---|---|---|
Type Status | Holotype | Paratype | Paratype |
Sex | Male | Female | Female |
Snout vent length | 51.4 | 49.1 | 55.7 |
Tail length | 47.1 | 35.4 | -57.5 |
Tail condition | Original | Regenerated | Regenerated |
Head length | 11.9 | 10.9 | 12.3 |
Head width | 9.0 | 7.5 | 8.5 |
Snout length | 4.9 | 4.5 | 5.1 |
Eye distance | 2.3 | 2.2 | 2.6 |
Eye-Ear distance | 4.0 | 3.5 | 4.3 |
Precloacal pores (males) | 9 | – | – |
Dorsal rows per tail verticil | 5 | – | 5 |
Ventral rows per tail verticil | 4 | – | 4 |
Scales below 4th toe | 9 | 8 | 7 |
Mid-body scale rows | 83 | 82 | 76 |
Scales between eyes | 15 | 13 | 14 |
Scales: nostril to eye | 7 | 7 | 9 |
Scales: ear to eye | 16 | 14 | 17 |
Anterior nasals in contact | No | No | No |
Supralabials | 9 | 7 | 9 |
Infralabials | 8 | 9 | 8 |
(see Table
SVL 36.4–59.6 mm; original tail length 36.4–57.8 mm, 0.94 times SVL; head length 1.19–1.75 times head width; snout 1.91 times diameter of eye. The supranasals in contact in 22 specimens and separated by granules in eight specimens, usually with a single large granule in contact with the rostral between the supranasals, followed by 1–2 smaller granules in lateral contact; the first upper labial and rostral always enters the nostril and the width of the rostral at the lip margin is always wider than that of the mental; 2–4 postmental scales; supralabials 8–9; infralabials 8–9; scales between anterior edge of eye 12–16; scales between nostril and anterior edge of orbit 7–11; scales between anterior edge of ear and rear margin of orbit 15–18; scales around mid-body 75–88; subdigital lamellae on 4th toe 7–9; dorsal scales per tail verticil 5 (TM 45366, TM 46588 and
In life (paratype
(Fig.
This species is currently known from southern Cuanza-Sul, central Huambo and northern Benguela Provinces, Angola (Fig.
NB 854, adult male, collected from Serra da Neve (-13.77354, 13.24825, 1944 m a.s.l.), Namibe Province, Angola, by Pedro Vaz Pinto, Ninda L. Baptista and Telmo António on 30 November 2017.
The specific epithet reflects the earlier prediction by WRB of the potential existence of an isolated population of Afroedura at Serra da Neve. We use the specific epithet “praedicta”, the Latin participle meaning predicted or anticipated, formed in the feminine genitive to match the gender of Afroedura.
A member of the greater ‘transvaalica’ group as it possesses two pairs of enlarged scansors per digit and a strongly verticillate and flattened tail (
Afroedura praedicta sp. nov. differs from other members of the A. bogerti-group by a combination of the following characters (see Tables
Adult male; SVL 51.6 mm; tail 37.0 mm (regenerated tail, except for the first verticil), with a small mid-ventral horizontal incision for the removal of liver sample. Measurements and meristic characters of holotype presented in Table
Measurements (in mm) and scale counts for the type series of Afroedura praedicta sp. nov.
Catalogue number | NB 854 |
|
NB 855 |
|
NB 1054 | NB 1055 |
---|---|---|---|---|---|---|
Type status | Holotype | Paratype | Paratype | Paratype | Paratype | Paratype |
Sex | Male | Male | Male | female | female | Juvenile |
Snout vent length (max) | 51.6 | 51.4 | 49.6 | 51.1 | 46.0 | 28.0 |
Head length | 12.9 | 12.4 | 12.8 | 10.1 | 10.0 | 6.3 |
Tail length | 37.0 | 29.2 | – | 43.4 | – | 22.1 |
Tail condition | Regenerated | Regenerated | Truncated | Regenerated | Truncated | Original |
Head width | 7.9 | 7.3 | 6.8 | 6.7 | 6.3 | 4.7 |
Snout length | 5.0 | 4.8 | 4.8 | 4.2 | 4.3 | 2.5 |
Eye distance | 2.6 | 2.7 | 3.1 | 2.4 | 2.3 | 1.8 |
Eye-ear distance | 4.2 | 3.9 | 4.8 | 3.8 | 3.7 | 2.4 |
Precloacal pores (males) | 8 | 8 | 8 | – | – | – |
Dorsal rows per tail verticil | 4 | 4 | – | 4 | – | 4 |
Ventral rows per tail verticil | 5 | 5 | – | 5 | – | 5 |
Scales below 4th toe | 9 | 11 | 10 | 9 | – | 9 |
Mid-body scale rows | 74 | 75 | 74 | 75 | 73 | 78 |
Scales between eyes | 12 | 13 | 12 | 14 | 15 | 15 |
Scales: nostril to eye | 9 | 11 | 10 | 9 | 11 | 11 |
Scales: ear to eye | 16 | 15 | 15 | 15 | 15 | 13 |
Anterior nasals in contact | Yes | Yes | Yes | Yes | Yes | Yes |
Supralabials | 8 | 10 | 8 | 10 | 9 | 10 |
Infralabials | 9 | 9 | 9 | 8 | 8 | 8 |
(see Table
In life (holotype NB 854, Fig.
(Fig.
This species is known only from the alkaline mountain complex of Serra da Neve (Fig.
Afroedura bogerti –
Males: TM 40508, TM 40512, TM 40516, TM 40518, collected from Tambor (-16.06667, 12.43333, 355 m a.s.l.), Namibe Province, Angola, by Wulf Haacke on 1 April 1971. Females:
(not examined). TM 40519–20, collected from Tambor (-16.06667, 12.43333, 355 m a.s.l.), Namibe Province, Angola, by Wulf Haacke on 1 April 1971; FKH 0341–2, collected from Omauha Lodge (-16.20061, 12.40183, 338 m a.s.l.), Namibe Province, Angola, by Pedro Vaz Pinto on 3 October 2019; CAS:HERP 263012–3, collected from Omauha (-16.19858, 12.40073, 338 m a.s.l.), Namibe Province, Angola, by Luis M.P. Ceriaco, Suzana Bandeira and Isham Agarwal on 25 and 27 November 2017; CAS:HERP 248780–1, collected 0.5 km south of Tambor (-16.07414, 12.43328, 352 m a.s.l.), Namibe Province, Angola, by William R. Branch, Krystal Tolley and John Measey on 23 January 2009.
This gecko is named after Donvé Branch, WRB’s wife, with the following personal quote: “This, the most beautiful of all the Angolan flat geckos, is named for my wife, Donvé Branch (‘Dove’) who bore the long periods I was away on fieldwork, and to whose nest I returned, and surrounded me with love until the end”. The name is constructed in the feminine singular genitive.
A member of the greater ‘transvaalica’ group as it possesses two pairs of enlarged scansors per digit and a strongly verticillate and flattened tail (
Afroedura donveae sp. nov. differs from other members of the A. bogerti-group by a combination of the following characters (see Tables
Adult female: SVL 61.0 mm; tail 59.0 mm (full original tail), with a small mid-ventral incision for the removal of liver sample. Measurements and meristic characters of holotype presented in Table
Measurements (in mm) and scale counts for the type series of Afroedura donveae sp. nov.
Catalogue number |
|
|
---|---|---|
Type Status | Holotype | Paratype |
Sex | Female | Female |
Snout vent length | 61.0 | 64.0 |
Tail length | 59.0 | 38.0 |
Tail condition | Original | Regenerated |
Head length | 16.6 | 13.2 |
Head width | 11.4 | 11.2 |
Snout length | 5.6 | 5.5 |
Eye distance | 3.4 | 3.1 |
Eye-Ear distance | 4.4 | 4.4 |
Dorsal rows per tail verticil | 6 | - |
Ventral rows per tail verticil | 7 | - |
Scales below 4th toe | 8 | 7 |
Mid-body scale rows | 74 | 68 |
Scales between eyes | 13 | 12 |
Scales: nostril to eye | 11 | 10 |
Scales: ear to eye | 13 | 14 |
Anterior nasals in contact | Yes | Yes |
Supralabials | 8 | 8 |
Infralabials | 10 | 10 |
SVL varied from 49.1–55.7 mm; original tail length 26.5–59.0 mm, 0.78 times SVL; head length 1.13–1.46 times head width; snout 1.99 times diameter of eye (see Table
In life (holotype
(Fig.
Currently known only from the south-western parts of Namibe Province in Angola, in granite formations around Tambor and on the right bank of the mid-Curoca River (Fig.
Afroedura bogerti –
Males:
Males:
(not examined). TM 24545, collected from Caraculo (-15.01667, 12.66667, 463 m a.s.l.), Namibe Province, Angola, by Charles Koch in September 1956; TM 40288, TM 40291–5, collected from Caraculo (-15.01667, 12.66667, 463 m a.s.l.), Namibe Province, Angola, by Wulf Haacke on 27 March 1971; TM 41140, TM 41143, collected from turn-off to Morro do Chapéu Armado (-14.51185, 12.50190, 462 m a.s.l.), Namibe Province, Angola, by Wulf Haacke on 18 April 1971; FKH 0248, collected from road to Praia do Furado (-14.78306, 12.41726, 403 m a.s.l.), Namibe Province, Angola, by Javier Lobón Rovira, Afonso and Pedro Vaz Pinto on 5 July 2019; P9-154, collected from Mariquita (-14.78355, 12.41783, 401 m a.s.l), Namibe Province, Angola, by Javier Lobón Rovira, Afonso and Pedro Vaz Pinto on 5 July 2019; NB 834–5, collected approx. 18 km E of Lucira (-13.90749, 12.69201, 332 m a.s.l.), Namibe Province, Angola, by Pedro Vaz Pinto, Ninda L. Baptista and Telmo António on 28 November 2017; CAS:HERP 264666–80, 26467, 264704, collected from Mocongo (= Mucungo) Farm (-14.7789, 12.48745, 309 m a.s.l.), Namibe Province, Angola, by Luis M.P. Ceriaco, Mariana Marques and Joyce Janota between 2–6 August 2018; NB 602, collected from Sta Maria (-13.49813, 12.60921, 332 m a.s.l.), Benguela Province, Angola, by Afonso and Pedro Vaz Pinto on 12 July 2017; FKH 0005–6, collected from Fazenda Carivo (-13.195467, 13.424319, 438 m a.s.l.), Benguela Province, Angola, by Pedro Vaz Pinto on 5 June 2018; CAS 263848–9, INBAC: AMB 10691, CAS 263878, collected from Tundavala (-14.82386, 13.38114, 1295 m a.s.l.), Huíla Province, Angola, by Mariana P. Marques, Luis M.P. Ceriaco, Suzana Bandeira, Matthew Heinicke, Brent Butler and Timóteo Júlio on 1 and 9 August 2017. All material referable to the new species based on geographical distribution and closeness to examined material.
This species is named in honour of father and son, Pedro and Afonso Vaz Pinto, two enthusiastic Angolan naturalists with whom WRB spent a great deal of time in the field, to recognise their contributions in collecting and studying Angolan herpetofauna. The name is constructed in the masculine plural genitive.
A member of the greater ‘transvaalica’ group as it possesses two pairs of enlarged scansors per digit and a strongly verticillate and flattened tail (
Afroedura vazpintorum sp. nov. differs from other members of the A. bogerti-group by a combination of the following characters (see Tables
Adult male; SVL 50.6 mm; tail 44.5 mm (partly regenerated tail); with a small mid-ventral incision for the removal of liver sample. Measurements and meristic characters of holotype presented in Table
Measurements (in mm) and scale counts for the type series of Afroedura vazpintorum sp. nov.
Catalogue number |
|
|
|
|
|
---|---|---|---|---|---|
Type Status | Holotype | Paratype | Paratype | Paratype | Paratype |
Sex | Female | Male | Male | Female | Female |
Snout vent length | 50.6 | 50.2 | 46.7 | 51.9 | 50.7 |
Tail length | 44.5 | 27.0 | 22.7 | 34.1 | 24.7 |
Tail condition | Original | Regenerated | Regenerated | Regenerated | Regenerated |
Head length | 11.1 | 11.2 | 10.3 | 10.8 | 11.1 |
Head width | 7.4 | 7.6 | 7.4 | 7.2 | 7.8 |
Snout length | 4.3 | 4.4 | 4.0 | 4.4 | 4.4 |
Eye distance | 2.5 | 2.7 | 2.3 | 2.5 | 2.6 |
Eye-Ear distance | 4.1 | 3.9 | 3.9 | 4.2 | 3.9 |
Precloacal pores | - | 12 | 10 | - | - |
Dorsal rows per tail verticil | 5 | - | 5 | 5 | 7 |
Ventral rows per tail verticil | 6 | - | 6 | 6 | 7 |
Scales below 4th toe | 9 | 7 | 8 | 7 | 7 |
Mid-body scale rows | 73 | 81 | 79 | 83 | 74 |
Scales between eyes | 11 | 14 | 14 | 11 | 13 |
Scales: nostril to eye | 8 | 9 | 8 | 7 | 7 |
Scales: ear to eye | 14 | 17 | 17 | 16 | 15 |
Anterior nasals in contact | Yes | Yes | Yes | Yes | Yes |
Supralabials | 9 | 8 | 8 | 9 | 8 |
Infralabials | 8 | 9 | 8 | 9 | 9 |
(see Table
In life (paratype
(Fig.
Known from various localities in the coastal lowlands of Namibe and Benguela Provinces of Angola, stretching for about 250 km along the coast and up to 60 km inland, which is probably a fair reflection of the species’ global range (Fig.
1 | Mid-body scale rows more than 95 | 2 |
– | Mid-body scale rows less than 95; occurs in northern Namibia and Angola | 4 |
2 | Rostral usually bordering nostril | 3 |
– | Rostral usually excluded from nostril | A. loveridgei |
3 | Anterior nasals in contact (very rarely separated); scales around mid-body: South Africa 102–118 (mean 109), northern Zimbabwe 108–119 (average 114) | A. transvaalica |
– | Anterior nasals separated by 1–3 granules; scales around mid-body 99–101 (average 100) | A. gorongosa |
4 | Each tail verticil usually comprising 5 ventral and 6 dorsal rows of scales; anterior nasals always in contact; ventrum immaculate | 5 |
– | Each tail verticil usually comprising 4 ventral and 5 dorsal rows of scales; anterior nasals not always in contact; ventrum greyish with small black specks | 6 |
5 | Mid-body scales 64–78 (mean 72.8); larger average adult size 57.1 mm SVL; precloacal pores 11–12 (mean 11.5) in males; bold colouration | A. donveae sp. nov. |
– | Mid-body scales 73–86 (mean 80.3); smaller average adult size 48.6 mm SVL; precloacal pores 9–11 (mean 10.2) in males; dull colouration | A. vazpintorum sp. nov. |
6 | Anterior nasals always in contact | A. praedicta sp. nov. |
– | Anterior nasals not always in contact | 7 |
7 | Mid-body scales 69–77 (mean 73.5) | A. bogerti |
– | Mid-body scales 76–88 (mean 79.3) | A. wulfhaackei sp. nov. |
When
The radiation within Angolan Afroedura seems to have followed a major split that separated the west-central highlands from a south-western group. Being a strictly rupicolous gekkonid genus that typically displays low dispersal mobility, populations could easily become isolated in suitable remaining habitat, thus leading to speciation events in these “rock islands” or inselbergs (
The obvious genetic (sub-)structure, identified between A. wulfhaackei sp. nov. and the three morphologically-indistinguishable clades Afroedura sp. 5–7 and within A. vazpintorum sp. nov. (Fig.
Overall, the speciation pattern observed for Angolan Afroedura is similar to that of sympatric species of Cordylus (also rupicolous). Angolan Cordylus also include a central highland and a south-western group. The former group currently comprises a single species, C. angolensis, but it may, in fact, represent a species complex (
A flat gecko discovered in a rock crevice on the summit of the Otjihipa Mountains, northern Opuwo District, Namibia (
In recent years, we have seen Angola embracing international collaboration that has led to an increase in biodiversity knowledge (
We thank José Luis Alexandre and Fernanda Lages from ISCED-Huíla for organising export permits for vouchers, within the framework of the Southern African Science Service Centre for Climate Change and Adaptive Land Management (SASSCAL) Project funded by the Federal Ministry of Education and Research (BMBF) under promotion number 01LG1201M. Other material was collected and exported under the following export permit issued by the Angolan Ministry of Environment Institute of Biodiversity (MINAMB): 31/GGPCC/2016. Support for biodiversity surveys that resulted in the discovery of the new species was provided by the National Research Foundation of South Africa (WRB), the South African National Biodiversity Institute (2009 expedition) and the National Geographic Okavango Wilderness Project (2016 expedition). NLB and JLR are currently supported by Fundação para a Ciência e Tecnologia (FCT) contract SFRH/PD/BD/140810/2018 and PD/BD/140808/2018, respectively. We thank Lemmy Mashini and Lauretta Mahlangu for access to material housed in the Ditsong National Museum of Natural History. Pedro Vaz Pinto provided valuable inputs to help improve the quality of the paper. Krystal Tolley, John Measey, Pedro Vaz Pinto, Luke Verburgt and João Simões de Almeida assisted in the field and collected valuable material. Luis Ceríaco provided high resolution images of the type specimen of Afroedura bogerti for examination and comparison with other Angolan Afroedura. We thank Mike Bates, Mark-Oliver Rödel and Johannes Penner for their insightful edits during the review process.