Research Article |
Corresponding author: Pedro de S. Castanheira ( pedro.castanheira@murdoch.edu.au ) Academic editor: Danilo Harms
© 2023 Pedro de S. Castanheira, Volker W. Framenau.
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:
Castanheira P de S, Framenau VW (2023) Kangaraneus, a new genus of orb-weaving spider from Australia (Araneae, Araneidae). Zoosystematics and Evolution 99(2): 307-323. https://doi.org/10.3897/zse.99.101417
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A new Australian genus in the orb-weaving spider family Araneidae Clerck, 1757 is described, Kangaraneus gen. nov., with K. arenaceus (Keyserling, 1886) comb. nov. (New South Wales, Queensland, South Australia, Victoria and Western Australia) as the type species and also including two other species: Kangaraneus amblycyphus (Simon, 1908) comb. nov. (Australian Capital Territory, New South Wales, Queensland, South Australia, Victoria and Western Australia) and K. farhani sp. nov. (Australian Capital Territory, New South Wales, South Australia, Victoria and Tasmania). The new genus is included in the informally termed Australasian ‘backobourkiine’ clade due to the presence of its putative synapomorphies, specifically a single patellar macroseta on the male pedipalp and its median apophysis forming an arch over the radix. It includes medium-sized orb-weaving spiders (total length 3–12 mm) with distinct humeral humps on the almost triangular abdomen. Therefore, within the backobourkiines, it is somatically most similar to Novakiella Court & Forster, 1993 but differs considerably in male genitalic characters, including a C-shaped median apophysis with an acute tip. Genitalia are most similar to those in Quokkaraneus Castanheira & Framenau, 2023 from which the new genus differs by the lack of the white colouration and the shape of the abdomen.
Araneus, backobourkiines, systematics, taxonomy
A recent multi-gene molecular study on world-wide orb-weaving spiders in the family Araneidae Clerck, 1757 placed many Australian species in an informally termed clade, the ‘backobourkiines’ (
Putative genera of the informally termed backobourkiine clade (sensu
Genus | Total no. of species ( |
No. of species in Australia | Remarks |
---|---|---|---|
Acroaspis Karsch, 1878 | 5 | 5 | included in |
Backobourkia Framenau, Dupérré, Blackledge & Vink, 2010 | 4 | 4 | revised in |
Carepalxis L. Koch, 1872 | 12 | 5 | Taxonomy unresolved; Nearctic species reviewed in |
Hortophora Framenau & Castanheira, 2021 | 13 | 10 | revised in |
Kangaraneus gen. nov. | 3 | 3 | this study |
Lariniophora Framenau, 2011 | 1 | 1 | monotypic ( |
Leviana Framenau & Kuntner, 2022 | 5 | 5 | revised in |
Novakiella Court & Forster, 1993 | 2 | 2 | revised in |
Plebs Joseph & Framenau, 2012 | 22 | 7 | revised in |
Quokkaraneus Castanheira & Framenau, 2022 | 1 | 1 | monotypic ( |
Salsa Framenau & Castanheira, 2022 | 5 | 5 | revised in |
Socca Framenau, Castanheira & Vink, 2022 | 12 | 12 | revised in |
dehaani-group (sensu |
3 | 1 |
Parawixia dehaani (Doleschall, 1859) was part of the backobourkiines in |
The Australian Araneus arenaceus (Keyserling, 1886), originally described from New South Wales and Queensland, and Araneus amblycyphus Simon, 1908 from Western Australia, are morphologically very similar species and both display the proposed male genitalic synapomorphies of the backobourkiines as mentioned above. However, they do not display any of the genus-level synapomorphies that characterise the backobourkiine genera treated so far (Table
Due to their unique morphology, we consider Araneus arenaceus and A. amblycyphus to represent a new genus within the backobourkiines, pending a comprehensive molecular and systematic study of this clade. The aim of this study is to revise this new genus as a testable hypothesis for future systematic work, specifically to elucidate phylogenetic relationships to or within the backobourkiines.
This study is based on the examination of virtually all orb-weaving spider specimens in the major Australian museum collections and overseas collections where historical type material is lodged, totalling almost 12,000 records (vials) up to this date.
Descriptions and terminology follow recent publications on Australian backobourkiine orb-weaving spiders (e.g.,
Microscopic photographs were taken with two different stereo-imaging systems. A setup at the Natural History Museum, Copenhagen (Denmark) allowed taking images with a Nikon D300 digital SLR camera attached via a C-mount adapter to a Leica M16A stereomicroscope. Images of different focal plains were stacked with Automontage (vers. 5.02) software from Syncroscopy to increase depth of field. A second set-up at the Harry Butler Institute, Murdoch University (Australia) supported taking microscopic images in different focal planes with a Leica DMC4500 digital camera mounted to a Leica M205C stereomicroscope and combined using the Leica Application Suite X, v. 3.6.0.20104. All photos and plates were edited with Photoshop CC 2020.
All measurements are given in millimetres. They were taken with an accuracy of one tenth of a millimetre, except for the eye and labium measurements, taken with an accuracy of one hundredth of a millimetre.
Maps were compiled in the software package QGis v. 3.2.6 Buenos Aires (https://qgis.org/en/site/; accessed 1 September 2022). Geographic coordinates were extracted directly from original labels or the registration data as provided by the museums. When no detailed geographic information was available, localities were estimated based on Google Earth v. 9.1.39.3 (https://earth.google.com/web/ accessed 1 September 2022) to the closest minute of Latitude and Longitude.
Morphology
ALE anterior lateral eyes
AME anterior median eyes
PLE posterior lateral eyes
PME posterior median eyes
TL Total length
Collections
MV Museums Victoria, Melbourne (Australia);
SAM South Australian Museum, Adelaide (Australia);
Order Araneae Clerck, 1757
Family Araneidae Clerck, 1757
Epeira arenacea Keyserling, 1886 (designated here).
The genus-group name is a compound noun composed of ‘Kang-’ in reference to the Kangaroo, genus Macropus Shaw, 1790, the renowned Australian marsupial, and ‘-araneus’, a genus-group name for orb-weaving spiders. The gender of the genus-group name Kangaraneus is masculine.
Within the backobourkiines as circumscribed by
Kangaraneus arenaceus (Keyserling, 1886) comb. nov., male (
Medium-sized orb-weaving spiders, with males (ca. TL 3.2–6.7) on average smaller than females (ca. TL 6.3–10.4). Carapace longer than wide with cephalic region slightly narrower in males than in females, light or dark brown (e.g., Figs
Male pedipalp patella with a single macroseta (e.g., Figs
All Australian mainland states and Tasmania, excluding Northern Territory. (Fig.
Kangaraneus arenaceus (Keyserling, 1886) comb. nov. (type-species), K. amblycyphus (Simon, 1908) comb. nov., and K. farhani sp. nov.
Epeira arenacea
Araneus arenaceus
(Keyserling, 1886).-
Lectotype
of Epeira arenacea Keyserling, 1886 (designated here): female, Sydney (33°53'S, 151°13'E, New South Wales, AUSTRALIA) (NHM 1890.7.1.4138), examined. Paralectotypes: 5 males, 3 females, same locality as lectotype (
AUSTRALIA – New South Wales • 2 females, 3 juveniles, ‘Allambi’ Telegraph Point, 31°19'S, 149°15'E (
Males of Kangaraneus arenaceus comb. nov. are most similar to those of K. amblycyphus comb. nov. as both have pedipalp with a similar median apophysis with a blunt central protrusion and a conductor with an elongated basal protrusion (Figs
Male (based on
Female (based on
Kangaraneus gen. nov. female epigynes, cleared. A. K. arenaceus (Keyserling, 1886) comb. nov., ventral view (
Males total length 4.5–6.7 (n = 6); females total length 5.6–8.7 (n = 6). The colouration of K. arenaceus comb. nov. males can vary considerably, with some specimens having a dark brown carapace and a black abdomen with a large white patch in the cardiac area (Fig.
The syntypes of Epeira arenacea Keyserling, 1886 are deposited at the
Specimens of K. arenaceus comb. nov. have mainly been found from October to January, with only a few specimens collected in the colder months like June and August. Therefore, the species seems to be largely spring to early summer mature.
Habitat descriptions on the collection labels include “cypress and brigalow” and “in low bush”. Two labels indicated that the species falls prey to wasps (“in wasp nest” and “mud dauber wasp nest”).
Kangaraneus arenaceus comb. nov. has been found in eastern New South Wales and Queensland, the Fleurieu Peninsula and Kangaroo Island in South Australia, Victoria and south-western Western Australia (Fig.
Araneus amblycyphus
Araneus amblycyphus
Simon, 1908.-
Lectotype
of Araneus amblycyphus Simon, 1908 (designated here): 1 female Busselton (33°38'S, 115°20'E, Western Australia, AUSTRALIA) (
AUSTRALIA – Australian Capital Territory • 1 female, Corin Dam, 57 km W of Canberra, 35°34'S, 148°50'E (
Male K. amblycyphus comb. nov. can be distinguished from those of the very similar K. arenaceus comb. nov. by the double central protrusion on the median apophysis, the bubble-shaped terminal apophysis, and the shorter and thicker basal protrusion of the conductor with a lamellar apical protuberance (Figs
Kangaraneus amblycyphus (Simon, 1908) comb. nov., male (
Male (based on
Female (based on
Males total length 3.2–5.8 (n = 4); females total length 3.5–6.0 (n = 7). There was little colour variation in male K. amblycyphus comb. nov. Some female specimens had a large white patch completely covering the ventral part of abdomen and/or a rounded white patch in the cardiac area, similar to males of K. arenaceus comb. nov. and K. farhani sp. nov.
There are only two syntypes for this species, one female deposited in Paris (
Mature specimens of K. amblycyphus comb. nov. were mainly collected between September and December with few specimens collected in February and April; the species therefore appears to be spring to early summer mature.
Habitat descriptions on the labels include “cypress and brigalow” and “Callitrus”; the species was also found in a “wasp nest”.
The distribution of K. amblycyphus comb. nov. is very similar to that of K. arenaceus comb. nov. although it has been found much further north in Queensland. It occurs in all Australian states except Northern Territory and Tasmania (Fig.
Holotype male, Frankston (38°09'S, 145°08'E, Victoria, Australia), 25 September 1947 (MV K-9854).
AUSTRALIA – Australian Capital Territory • 2 females, Corin Dam, 35 km W Canberra, 35°34'S, 148°50'E (
The specific name is a patronymic in honour of Farhan Bokhari, a colleague at the Harry Butler Institute (Murdoch University).
Male K. farhani sp. nov. can be distinguished from the other two species of the genus by the central protrusion of the median apophysis being much longer, somewhat blade-like and heavily sclerotised (Figs
Kangaraneus farhani sp. nov., female. A. Dorsal habitus (
Male (based on holotype MV K-9854). Total length 5.8. Carapace 3.6 long, 3.1 wide, light brown, slightly lighter in cephalic area (Fig.
Female (based on
Males total length 5.6–5.8 (n = 2); females total length 6.3–10.4 (n = 8). Males display similar colour variations to K. arenaceus comb. nov. with one specimen having a large white patch in the cardiac area. Females do not display much colour variation, but half had the epigyne scape broken off.
Mature specimens of K. farhani sp. nov. were collected between July and early December, except for one female collected in February. The species therefore seems to be largely winter- to spring mature.
Kangaraneus farhani sp. nov. generally appears to build its web low in grass, with original labels reading “among grass in garden”, “garden”, “orb-web near ground”, “in grass at side of creek”.
We here consider Kangaraneus gen. nov. to be the twelfth genus within the backobourkiines sensu
The distribution patterns of K. arenaceus comb. nov. and K. amblycyphus comb. nov. are very similar, and there are several localities where both species were found together, even simultaneously (Busselton, Western Australia; Braemar State Forest, Queensland; Dudley Conservation Park, South Australia; Sydney, New South Wales). This made initial matching of sexes difficult. However, as multiple males and females of each species as diagnosed here were found together in several localities (Shannon and Sterling Range National Parks, Western Australia; Hornsby, Waitara Creek, New South Wales; Braemar State Forest, Queensland), we consider the results of our taxonomic revision the most likely match for males and females of K. arenaceus comb. nov. and K. amblycyphus comb. nov. Our species diagnoses have been compiled based on best evidence and by arachnologists highly experienced in araneoid taxonomy. However, there remains the remote possibility that either males and females are matched incorrectly or, alternatively and even less likely, that male and female genitalia in these species are highly variable and both represent the same species. Future molecular analyses could confirm the matching and therefore the distribution patterns of these species.
We thank (in no particular order) Peter Lillywhite, Joseph Schubert, Catriona McPhee, Ken Walker, Richard Marchant, Simon Hinkley (NMV), Robert Raven (retired), Owen Seeman, Jeremy Wilson, Michael Rix (
Funding for revisions of the Australian Araneidae was provided by the Australian Biological Resources Study (ABRS) (grant no. 205-24 [2005–2008] to VWF and N. Scharff and grant number 4-EHPVRMK [2021–2023] to VWF, PSC, N. Scharff, D. Dimitrov, A. Chopra and R. Baptista). Additional funding was provided by a Synthesis project grant (GB-TAF-TA3-008) to PdSC to visit the