Research Article |
Corresponding author: Francesco Ballarin ( ballarin.francesco@gmail.com ) Academic editor: Danilo Harms
© 2022 Francesco Ballarin, Paolo Pantini.
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:
Ballarin F, Pantini P (2022) An unexpected occurrence: discovery of the genus Cybaeopsis Strand, 1907 in Europe with the description of a new species from Italy (Arachnida, Araneae, Amaurobiidae). Zoosystematics and Evolution 98(2): 377-385. https://doi.org/10.3897/zse.98.90858
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We report on the unexpected finding of a new species of the genus Cybaeopsis Strand, 1907, C. lodovicii sp. nov. from the Northern Apennine Mountains in Italy. This is the first documented record of a Cybaeopsis species in Europe. Other currently known species of this genus have been previously recorded in North America, the Russian Far-East and Japan. The new species is illustrated and described based on both sexes. Another species from Portugal, Cybaeopsis theoblicki (Bosmans, 2021) comb. nov., recently described in the genus Callobius Chamberlin, 1947, is hereby transferred to Cybaeopsis on the basis of morphological characters. An updated key to the European genera of Amaurobiidae is provided.
disjunct distribution, endemism, new combination, new record, taxonomy
Cybaeopsis Strand, 1907 is a small genus of cribellate spiders belonging to the family Amaurobiidae Thorell, 1870 currently numbering 10 species (WSC 2022). The majority of the known Cybaeopsis species (9 species) are endemic to North America (
While studying spider material collected with pitfall traps in beech forests in Northern Apennines, Italy, we found specimens of an unknown amaurobiid species. Surprisingly, a detailed morphological examination of the samples revealed them as belonging to an undocumented species of the genus Cybaeopsis. This finding represents the first record of Cybaeopsis in Italy and in the whole Western Palaearctic, far outside the supposed natural range of this genus. In addition, while checking information on Cybaeopsis, we realized that another closely related species, Callobius theoblicki Bosmans, 2021, has been recently found in Portugal but described as belonging to another genus (
Spider samples were collected during surveys organized by the Museo Civico di Scienze Naturali “E. Caffi” of Bergamo (
The following abbreviations are included in text and figures: ALE = anterior lateral eyes; AME = anterior median eyes; PLA = posterior lateral eyes; PMA = posterior median eyes; Cd = copulatory ducts; Cn = conductor; Co = copulatory openings; Da1–4 = dorsal apophyses of tibia; Em = embolus; Ip = internal pockets of the lateral lobes; Ll = lateral lobes; Ma = median apophysis; Pto = prolateral tegular outgrowth; RTA = retrolateral tibial apophysis; Rto = retrolateral tegular outgrowth; Sp = spermathecae; St = subtegulum; Te = tegulum; Ti = tibia; Va = ventral tibial apophysis.
The samples used in this study are preserved in the following collections:
Cybaeopsis typicus Strand, 1907 (Fig.
Cybaeopsis euopla (Bishop & Crosby, 1935) (Fig.
1 | Cribellum absent, promargin of chelicerae with a brush of setae, serrated keel on the inner margin of the cheliceral groove, prolateral position of the median apophysis, embolus complex bent 3 times, solid epigynal plate with copulatory openings located in the epigastral fold, found in the Russian Caucasus | Ovtchinnikovia Marusik, Kovblyuk & Ponomarev, 2010 (1 sp.) |
– | Cribellum present, other characters different | 2 |
2 (1) | Anterior median eyes equidistant from each other and from anterior lateral eyes, opisthosoma with dark median band, male palpal tibia lacking any dorsal apophysis, epigyne with triangular median plate with a strongly sclerotized median part, found in Northern Scandinavia and Siberia | Arctobius Lehtinen, 1967 (1 sp.) |
– | Anterior median eyes closer to each other than to lateral eyes, median band on opisthosoma absent or visible only in the anterior half, male palpal tibia with distinct dorsal apophysis, epigyne bilobate, or with weakly sclerotized median plate | 3 |
3 (2) | Dorsal tibial apophysis usually massive and short, always not elongated and not overlying cymbium, epigyne with median plate not clearly separated into two parts | Amaurobius C. L. Koch, 1837 (38 spp.) |
– | Dorsal tibial apophysis elongated and partly overlying cymbium, epigyne bilobate | 4 |
4 (3) | Retrolateral tibial apophysis ending bifurcated, dorsal tibial apophysis with several sharp branches (Da1–4), at least two branches (Da1–2) long and sharp, epigyne extended laterally and lacking a median lobe. Small size (< 6.5 mm) | Cybaeopsis Strand, 1907 (2 spp.) |
– | Retrolateral tibial apophysis ending unbranched, dorsal tibial apophysis with less branches (usually 2), only one of them long and sharp, epigyne extended antero-posteriorly and with median lobe. Medium to large size (> 8 mm) | Callobius Chamberlin, 1947 (2 spp.) |
Family Amaurobiidae Thorell, 1870
Cybaeopsis typicus Strand, 1907 from the south part of the Russian Far-East and northern Japan.
Genus closely related to Callobius but its members are smaller in size (2.5–6.5 mm vs. 8–12 mm). Males of Cybaeopsis can be easily distinguished from males of Callobius by the bifurcated retrolateral tibial apophysis (RTA) (vs. unbranched) and by the presence of 2–4 dorsal apophyses (Da1–4), at least 2 of them long and sharp (vs. 2–3 Da of which only one is long and sharp) (Figs
Total length 2.5–5 (male), 3–6.5 (female). Carapace brown, dark brown or orange-yellowish with darker dorsal radiating striae, fovea clearly visible. Chelicerae frontally swollen. Eight eyes arranged into 2 rows of 4, AME the smallest. Legs uniformly brownish or brown-yellowish, darkened distally. Tarsi with 3 claws, scopula and claws tufts absent. Leg formula: IV, I, II, III. Opisthosoma brown-greyish or dark grey usually with lighter chevrons marks on the dorsal side, unmarked in some specimens. Cribellum undivided. Male palp with retrolateral tibial apophysis (RTA) distally bifurcated, dorsal tibial apophysis divided into several branches of different length (Da1–4), at least two branches (Da1–2) long and sharp. Median apophysis (Ma) sturdy. Prolateral and retrolateral tegular outgrowth (Pto and Rto) more or less developed and protruding from tegulum. Conductor (Co) wide. Embolus (Em) short and sturdy, ribbon-like. Epigyne divided into 2 lobes by a central septum, extended laterally, median lobe absent.
Cybaeopsis armipotens (Bishop & Crosby, 1926); C. euopla (Bishop & Crosby, 1935); C. hoplites (Bishop & Crosby, 1926); C. hoplomacha (Bishop & Crosby, 1926); C. lodovicii sp. nov.; C. macaria (Chamberlin, 1947); C. pantopla (Bishop & Crosby, 1935); C. spenceri (Leech, 1972); C. theoblicki (Bosmans, 2021) comb. nov.; C. tibialis (Emerton, 1888); C. typicus Strand, 1907; C. wabritaska (Leech, 1972)
North America, Russian Far-East (Sakhalin and Kurile Is.), Japan (Hokkaido Is., Eastern Honshu Is.), Southern Europe (Italy, Portugal).
Holotype ♂ ITALY: Liguria: Genova, Mezzanego, Giaiette, 850 m, (44°25'03"N, 9°28'08"E), beechwood, pitfall trap, 31 Oct. 2009–25 May 2010, O. Lodovici, P. Pantini & M. Valle leg.
Paratypes: ITALY: Liguria: 1♂, 4♀♀, same data as the holotype; 2♀♀, same locality, 25 May–18 Aug. 2010 • 1♀, Foresta Demaniale Monte Zatta, ex colonia Devoto, 1050 m, beechwood, pitfall traps 31 Oct 2009–25 May 2010 • 2♀♀, same locality, 25 May–18 Aug. 2010, all O. Lodovici, P. Pantini & M. Valle leg.
The specific epithet is a patronym in honor of our colleague and friend Omar Lodovici (Museo Civico di Scienze Naturali of Bergamo, Italy).
Male of the new species can be distinguished from male of C. theoblicki and C. typicus by the different shape and number of the dorsal apophyses of the palpal tibia (Da): four Da with Da2 and Da3 long and Da2 ending wider in C. lodovicii sp. nov. (vs. only three Da in C. theoblicki and Da2 shorter with a sharp end and Da3 very short in both C. theoblicki and C. typicus). In addition, C. lodovicii sp. nov. can be distinguished by the absence of strongly protruding prolateral and retrolateral tegular outgrowths (Pto and Rto) (vs. strongly protruding Pto in C. typicus or Rto in C. theoblicki) (Figs
The different number and shape of Da and Ll quickly distinguish male and female C. lodovicii sp. nov. from the American congeners (for comparison see
(the specimens are in rather poor condition and the coloration may be different in freshly collected samples). Male (holotype). Habitus as in Fig.
Leg spination of male and female C. lodovicii sp. nov. Variability in number of spines among right and left legs is reported in parentheses. Abbreviations: d = dorsal spines, p = prolateral spines, r = retrolateral spines; v = ventral spines.
Male | Femur | Tibia | Metatarsus |
I | d1(2) r1 | d2 p2 r2 V2-2 | d2 p3 r3 v2-2-3 |
II | d1 p1 | p1(2) v2-2 | p2 v2-2-3 |
III | d2 p1 r1 | d1 p2 r2 v1-2-2 | d2 p3 r3 v2-2-3 |
IV | d1(2) r1 | d2 p2 r2 v1-2-2 | d3 p3 r3 v2-2-3 |
Female | Femur | Tibia | Metatarsus |
I | d1 p1 | p1 v1-2-1 | p1 v2-1-1 |
II | d1 p1 | p1 v1 | v1-3 |
III | d1(2) p1 r1 | d1 p2 r2 v1-(1) | d1 p3 r3 v2-3 |
IV | d1(2) | d1 p1 r2 v1-2-2 | p3 r3 v2-1-3 |
Cybaeopsis lodovicii sp. nov. male palp. A prolateral view; B retrolateral view; C ventral view; D dorsal view; E tibial, dorsal view; F SEM image of the tibial apophyses, dorsal view; G SEM image of detail of the RTA tip; H SEM image of detail of the median apophysis, ventral view. Abbreviations: Da 1–3 = dorsal apophyses; RTA = retrolateral tibial apophysis; Va = ventral apophysis. Scale bars: 0.2 mm (A–D); 0.1 mm (F); 0.02 mm (G); 0.05 mm (H).
Cybaeopsis lodovicii sp. nov., male and female. A epigyne, ventral view; B ditto, ventral view after maceration; C ditto, posterior view; D vulva, dorsal view; E male habitus, dorsal view; F female habitus, dorsal view. Abbreviations: Cd = copulatory duct; Co = copulatory opening; Ip = internal pocket; Ll = lateral lobe; Sp = spermatheca. Scale bars: 0.1 mm (A–D); 1 mm (E, F).
Cybaeopsis lodovicii sp. nov., male and female. A male palp, retrolateral view; B ditto, ventral view; C epigyne, ventral view; D cephalic area of female, frontal view. Abbreviations: Cn = conductor; Da 1–4 = dorsal apophyses of Tibia; Em = embolus; Ip = internal pocket; Ll = lateral lobe; Ma = median apophysis; Pto = prolateral tegular outgrowth; RTA = retrolateral tibial apophysis; Rto = retrolateral tegular outgrowth; St = subtegulum; Te = tegulum; Ti = tibia; Va = ventral apophysis. Scale bars: 0.2 mm (A–C); 0.5 mm (D).
Cybaeopsis typicus, male and female from Kunashir Island. A male palp, retrolateral view; B ditto, prolateral view; C ditto, ventral view; D ditto, dorsal view; E epigyne, ventral view; F ditto, posterior view. Photos by Y.M. Marusik Abbreviations: Co = conductor; Da 1–4 = dorsal apophyses of tibia; Em = embolus; Ll = lateral lobe; Ma = median apophysis; Pto = prolateral tegular outgrowth; RTA = retrolateral tibial apophysis; Rto = retrolateral tegular outgrowth; St = subtegulum; Te = tegulum; Va = ventral apophysis.
Female. Habitus as in Fig.
Leg spination as in Table
Endemic to Northern Apennines, Italy.
Litter of mountain beechwoods at mid-elevation (~800 m).
Callobius theoblicki Bosmans, 2021: 879, 32–41 (♂♀).
See
See
Portugal.
Litter of Pinus and Quercus forests at low and middle mountain range (from 160 to 890 m, see
Cybaeopsis theoblicki shows the typical morphological characters of Cybaeopsis, in particular: a retrolateral tibial apophysis ending bifurcated, three dorsal apophyses in the male palpal tibia two of which elongated and sharp, epigyne lacking a median lobe, and lateral lobes of epigyne extended laterally with a flat posterior margin. All these characters can be easily observed in the photos illustrated in
Several new species belonging to the family Amaurobiidae have been described in Europe in recent years, from Northern Apennines in Italy (Amaurobius pesarinii Ballarin & Pantini, 2017), Minorca (A. minorca Barrientos & Febrer, 2018), the Caucasus mountains (A. caucasicus Marusik, Otto & Japoshvili, 2020), and Portugal (Cybaeopsis theoblicki (Bosmans, 2021)) (
Cybaeopsis euopla, male and female from Ontario. A male habitus, dorsal view; B female habitus, dorsal view; C epigyne, ventral view; D male palp, retrolateral view; E ditto, ventral view; F original sample labels; G distribution of the genus Cybaeopsis. Scale bars: 1 mm (A, B); 0.5 mm (C–E).
The authors want to thank all the people who helped with this work and, in particular, Marco Valle, Giuseppe and Omar Lodovici for helping with the collection of the new species. We are thankful to Lorenzo Prendini (New York, USA) for the loan of samples of C. euopla and to Yuri M. Marusik (Magadan, Russia) for providing the photos of C. typicus used in this work. Many thanks to Elena Pelizzoli for providing the drawings. We are grateful to Katsuyuki Eguchi (Tokyo, Japan) for allowing us the use of microscopes and other equipment in the laboratories of the Tokyo Metropolitan University, and to Adam Cronin (Tokyo, Japan) for kindly checking the English in an early draft of the manuscript. This work has benefitted greatly from suggestions and comments from Yuri M. Marusik, Alireza Zamani and Zhe Zhao.