A taxonomic revision of the tube-web spiders of the genus Ariadna (Araneae: Segestriidae) in Tasmania Author Marsh, Jessica R. 0000-0002-4062-4155 Harry Butler Research Institute, Murdoch University, Murdoch, Western Australia 6150, Australia & Earth and Biological Sciences, South Australian Museum, GPO Box 234, Adelaide, South Australia 5001, Australia & jess. marsh @ murdoch. edu. au; https: // orcid. org / 0000 - 0002 - 4062 - 4155 jess.marsh@murdoch.edu.au Author Stevens, Mark I. 0000-0003-1505-1639 Earth and Biological Sciences, South Australian Museum, GPO Box 234, Adelaide, South Australia 5001, Australia & School of Biological Sciences, University of Adelaide, South Australia 5005, Australia. & mark. stevens @ samuseum. sa. gov. au, https: // orcid. org / 0000 - 0003 - 1505 - 1639 Author Framenau, Volker W. 0000-0002-7724-3831 Harry Butler Research Institute, Murdoch University, Murdoch, Western Australia 6150, Australia & Department of Terrestrial Zoology, Western Australia Museum, Locked Bag 49, Welshpool DC, Western Australia 6986, Australia Zoological Museum Hamburg, Leibnitz Institute for the Analysis of Biodiversity Change (LIB), Centre for Taxonomy & Morphology, Martin-Luther-King-Platz 3, 20146 Hamburg, Germany & volker. framenau @ murdoch. edu. au; https: // orcid. org / 0000 - 0002 - 7724 - 3831 volker.framenau@murdoch.edu.au text Zootaxa 2022 2022-03-03 5105 2 151 201 journal article 20383 10.11646/zootaxa.5105.2.1 412c4939-6e62-41c6-b2a9-e3d2053f9fcf 1175-5326 6332569 4F6F5BC6-2AAF-4B23-882E-F77C63BE4CC2 Ariadna crypticola sp. nov. Figs 13a–h , 14a–c , 12 http://zoobank.org/NomenclaturalActs/86b58502-feff-4622-b0a0-d41e511cabe6 FIGURE 12. Distribution of Ariadna amabilia sp. nov. (red dot) and Ariadna crypticola sp. nov. (blue triangle) FIGURE 13. Ariadna crypticola sp. nov. ♂ holotype (AM KS.111585); Bruny Island (Tasmania); a habitus, dorsal view; b same, ventral view; c same, lateral view; d eyes, dorsal view; e left metatarsus IV, preening comb, retrolateral view; f left leg I, ventral view; g same prolateral view; h same retrolateral view. Scale bars a–c = 2mm, d, f–h = 1mm, e = 0.5mm FIGURE 14. Ariadna crypticola sp. nov. ♂ holotype (AM KS.111585); Bruny Island (Tasmania); a left pedipalp, prolateral view; b same, retrolateral view; c same, dorsal view. Scale bar = 1mm. Type material. Holotype ♂ . AUSTRALIA : Tasmania : Bruny Island , Mt Mangana Nature Trail , 43.37°S , 147.28°E , 18 June 1974 , coll. R . Mawbey & D. Coleman , in moss ( AM KS .111585). Other material examined. Known only from the type specimen. Etymology. The specific epithet is taken form the Latin adjective, meaning ‘cryptic’ and refers to superficial morphological similarities of this species to other species of Tasmanian Segestriidae . Diagnosis. Males of A. crypticola sp. nov. are most similar to A. ferrogrisea sp. nov. , A. muscosa and A. subnubilum sp. nov. . It can be distinguished from A. ferrogrisea sp. nov. by its longer and more curved embolus and elongated bulb ( Fig. 14a, b cf. Fig. 16a, b ) and by the pattern of, and greater number of macrosetae on tibia and metatarsus of leg I of A. ferrogrisea sp. nov. ( Fig. 13f–h cf. Fig. 15f–h ). The species can be differentiated from A. muscosa by the more pronounced prolateral projection on the cymbium, by the pedipalp tibia, which is broader and shorter in A. crypticola sp. nov. than A. muscosa and by the embolus, which has a more defined apical hook in A. crypticola sp. nov. ( Fig. 14a–c cf. Fig. 25a–c ). It can be separated from A. subnubilum sp. nov. by the squarer pedipalp cymbium, with a less well defined prolateral extension of A. subnubilum sp. nov. ( Fig. 14c cf. Fig. 32c ), by the lack of a transverse abdominal pattern in A. subnubilum sp. nov. ( Fig. 13a cf. Fig. 31a ). The species can also be distinguished by the number of macrosetae in the preening comb of leg IV, being composed of five macrosetae in A. crypticola sp. nov. , eight in A. ferrogrisea sp. nov. , seven in A. muscosa and seven in A. subnubilum sp. nov. ( Fig. 13e cf. Figs 15e , 24e , 31e ). Description. ♂ (based on holotype ; AM KS.111585). Total length 4.3. Colour in ethanol: Carapace red brown, with irregular faint pallid patches laterally and anteriorly, with sparse brown setae; edges dark brown. Sternum orange-brown, with regular darker inter coxae patches; with scattered sparse, long dark setae. Labium, maxillae and chelicerae darker red brown. Abdomen dorsally dark grey, with faint, narrow white striations posteriorly; ventrally dark grey medially, paler laterally. Legs golden brown, with sparse dark setae ( Fig. 13a–h ). Cephalothorax: 2.16 long, 1.5 wide, 1.1 high. Carapace oval, with a broad neck anteriorly, edges gently undulating, fovea a shallow indentation ( Fig. 13a ), from lateral view carapace gently domed, highest just posterior to eye group ( Fig. 13c ). Labium narrowed anteriorly, about ¾ length of maxillae; chelicerae with basal transverse ridge, retromargin with single tooth, promargin with three teeth; sternum rounded oval, convex, with precoxal triangles and with smaller, broadly triangular intercoxal extensions ( Fig. 13b ). Posterior eye row recurved, eyes large, eye group occupying 0.6 of carapace width ( Fig. 13d ). Abdomen: 2.1 long; covering of short and long setae, longer posteriorly ( Fig. 13a ). Legs: Leg length ratio: I>II>IV>III. Leg I femur 1.4, patella 0.6, tibia 1.3, metatarsus 0.9, tarsus 0.5; Leg II femur 1.5, patella 0.4, tibia 0.9, metatarsus 1.2, tarsus 0.6; Leg III femur 1.2, patella 0.6, tibia 0.9, metatarsus 0.6, tarsus 0.4; Leg IV femur 1.4, patella 0.5, tibia 0.8, metatarsus 1.0, tarsus 0.5. Femur I bowed in dorsal view. Leg I femur d1-1-1-1, dp1ap; tibia p1-1-1, pv1-1-1-1-1ap, rv1-1-1-1-1ap, r1-1-1; metatarsus pv1-1-1ap, rv1-1-1ap. Leg II femur d1-1-1, dp1/0ap; tibia p1-1-2, pv1-1ap, rv1-1-1-1ap, r1-1-1; metatarsus p1-1, pv1-1-1-1ap(broken), rv1-1-1- 1ap, r1. Leg IV femur d1-1-1; tibia rv1-1; metatarsus 1-1-1ap. Retrolateral distal preening comb with 5 macrosetae ( Fig. 13e ). STC I, II with 6 teeth, ITC with small tooth. Tarsi with sparse distal ventral scopulose setae. Pedipalp: Tibia short, just greater than length of the cymbium; cymbium rounded square shape, with strongly triangular anterior prolateral extension, scopulose setae anteriorly. Bulb elongate globular in lateral view, embolus long, thin and strongly hooked apically ( Fig. 14a–c ). Variation. Known only from the type specimen. Distribution. Known only from one specimen from Bruny Island, a small island located off the south-eastern coast of Tasmania ( Fig. 12 ).