Ariadna ferrogrisea, Marsh & Stevens & Framenau, 2022

Marsh, Jessica R., Stevens, Mark I. & Framenau, Volker W., 2022, A taxonomic revision of the tube-web spiders of the genus Ariadna (Araneae: Segestriidae) in Tasmania, Zootaxa 5105 (2), pp. 151-201 : 170-172

publication ID	https://doi.org/ 10.11646/zootaxa.5105.2.1
publication LSID	lsid:zoobank.org:pub:4F6F5BC6-2AAF-4B23-882E-F77C63BE4CC2
DOI	https://doi.org/10.5281/zenodo.6335875
persistent identifier	https://treatment.plazi.org/id/130E6123-E5D6-45C6-837F-BC82365C3450
taxon LSID	lsid:zoobank.org:act:130E6123-E5D6-45C6-837F-BC82365C3450
treatment provided by	Plazi
scientific name	Ariadna ferrogrisea
status	sp. nov.

Treatment

Ariadna ferrogrisea View in CoL sp. nov.

Figs 15a–h View FIGURE 15 , 16a–c View FIGURE 16 , 17a–h View FIGURE 17 , 18a–b View FIGURE 18 , 19 View FIGURE 19

http://zoobank.org/NomenclaturalActs/130e6123-e5d6-45c6-837f-bc82365c3450

Type material. Holotype ♂. AUSTRALIA: Tasmania: Mount Wellington summit, under stones, 42.90°S, 147.24°E, 9 February 1946, V. V. Hickman ( AM KS.131053). GoogleMaps

Paratype ♀. Same data as holotype ( AM KS.131054) GoogleMaps .

Other material examined. 1 ♂, three ♀, same data as holotype ( AM KS.29167) GoogleMaps ; 1 ♂, 1 ♀, Mount Wellington, junction Organ Pipe Track and road, 42.90°S, 147.24°E, 19 May 1972, V GoogleMaps . V GoogleMaps . Hickman ( AM KS.29181) ; 1 ♂, 4 ♀, Mount Wellington, 42.90°S, 147.24°E, 13 September 1951 V GoogleMaps . V GoogleMaps . Hickman ( AM KS.29190) ; 3 ♀, Mount Wellington summit, 42.90°S, 147.24°E, 11 April 1939, V GoogleMaps . V GoogleMaps . Hickman ( AM KS.31093) .

Etymology. The specific epithet is a Latin adjective, meaning ‘steel grey’ and refers to the dark grey colouration of the abdomen of the species.

Diagnosis. A. ferrogrisea sp. nov. is most similar to A. crypticola sp. nov., A. muscosa and A. subnubilum sp. nov., from which it can be distinguished by the greater density of macrosetae on tibia and metatarsus of Leg I ( Fig. 15f–h View FIGURE 15 cf. Figs 13f–h View FIGURE 13 , 23f–h View FIGURE 23 , 31a–h View FIGURE 31 ) and the number of macrosetae in the preening comb of leg IV; with 8 macrosetae in A. ferrogrisea sp. nov., five in A. crypticola sp. nov., and seven in A. muscosa and A. subnubilum sp. nov. ( Figs 15e View FIGURE 15 , 17e View FIGURE 17 cf. Figs 13e View FIGURE 13 , 24e View FIGURE 24 , 31e View FIGURE 31 ). It is further differentiated from A. muscosa by the shape of the pedipalp cymbium, which has a more pronounced prolateral extension in A. ferrogrisea sp. nov. ( Fig. 16c View FIGURE 16 cf. Fig. 25c View FIGURE 25 ), and from A. subnubilum sp. nov. by the presence of transverse abdominal markings ( Fig. 5a View FIGURE 5 cf. Fig. 31a View FIGURE 31 ) and by the shape of the pedipalp bulb, which is pyramidal in A. ferrogrisea sp. nov., but is rounded oblong in A. subnubilum sp. nov. ( Fig. 16a, b View FIGURE 16 cf. Fig. 32a, b View FIGURE 32 ).

Description. ♂ (based on holotype; AM KS.131053). Total length 5.8.

Colour in ethanol: Carapace dark red brown, slightly lighter brown anterior to fovea; lateral edges dark brown; with sparse dark setae confined to lateral edges and anteriorly, denser anteriorly. Sternum dark orange brown, with sparse black setae; labium dark brown, maxillae orange brown; chelicerae dark red brown. Abdomen dorsally dark grey, with four narrow, faint, white striations posteriorly; ventrally dark grey, with faint, fine pale striations making the surface appear wrinkled. Legs golden brown and covered in dark setae ( Fig. 15a–h View FIGURE 15 ).

Cephalothorax: 2.8 long, 1.9 wide, 1.3 high. Carapace oval, narrowing anteriorly, edges gently undulating, fovea a shallow indentation ( Fig. 15a View FIGURE 15 ), from lateral view carapace gently domed, highest just anterior to fovea (Fig, 15c). Labium narrowed anteriorly, about ¾ length of maxillae; chelicerae with basal transverse ridge, retromargin with single tooth, promargin with three teeth; sternum elongated oval with precoxal triangles and with smaller, broadly triangular intercoxal extensions ( Fig. 15b View FIGURE 15 ). Posterior eye row slightly recurved, eye group occupying 0.6 of carapace width ( Fig. 15d View FIGURE 15 ).

Abdomen: 2.7 long; with sparse, moderately long setae ( Fig. 15a View FIGURE 15 ).

Legs: Leg length ratio: II>I>IV>III. Leg I femur 2.3, patella 0.9, tibia 1.9, metatarsus 1.9, tarsus 0.8; Leg II femur 2.3, patella 0.9, tibia 2.0, metatarsus 1.9, tarsus 0.8; Leg III femur 1.8, patella 0.6, tibia 1.0, metatarsus 1.3, tarsus 0.6; Leg IV femur 1.9, patella 0.5, tibia 1.0, metatarsus 1.4, tarsus 0.7. Femur I bowed in dorsal view. Macrosetae: Leg I femur d1-1-1-1ap, dp1ap; tibia p1-1-1-1, pv1-1-1-1-1-1ap, rv1-1-1-1-1ap, r1-1-1-1; metatarsus p1-1-1-1-1-1, r1-1-1(broken)-1(broken)-1ap. Leg II femur d1/0-1-1-1, dp1ap; tibia r1, rv1-1-1ap, pv1ap, p1-1-1; metatarsus p1, pv1-1-1-1-1ap, rv1-1-1-1ap, r1. Leg IV femur d1-1-1; tibia p1-1-1ap, r1; metatarsus r1-1-1ap, v1. Retrolateral distal preening comb with 8 spines ( Fig. 15e View FIGURE 15 ). STC I, II with 6 teeth, ITC with small tooth. Tarsi with distal ventral scopulose setae.

Pedipalp: Tibia short, just greater than length of the cymbium; cymbium rounded square shape, with anterior prolateral extension; bulb pyramidal in lateral view; embolus long, thin and hooked apically ( Fig. 16a–c View FIGURE 16 ).

Description. ♀ (based on paratype; AM KS.131054). Total length 6.41.

Colour in ethanol: Carapace dark, red brown, darker around edges with a pale area centrally demarking the raised caput, beginning anteriorly of fovea, and bordered by darker red brown. Carapace with sparse scattered setae, denser anteriorly. Sternum orange brown, darker near edges, with moderately long black setae; labium darker brown; maxillae orange brown, paler apically; chelicerae dark brown with dense, long, brown setae. Abdomen dorsally dark grey, with three narrow, faint, paler striations posteriorly, ventrally dark grey, with two broad paler patches laterally, with faint, fine pale striations making the surface appear wrinkled. Legs red brown, with dense setae ( Fig. 17a–h View FIGURE 17 ).

Cephalothorax: 3.1 long, 2.0 wide, 1.6 high. Carapace rounded rectangular, with broad, square ‘neck’ anteriorly, anterior edge straight ( Fig. 17a View FIGURE 17 ), lateral profile domed, highest just posterior to eye group ( Fig. 17c View FIGURE 17 ). Labium narrowed anteriorly, about ¾ length of maxillae; chelicerae robust with basal transverse ridge, retromargin with single tooth, promargin with three teeth; sternum elongated oval with precoxal triangles and with smaller, rounded intercoxal extensions ( Fig. 17b View FIGURE 17 ). Posterior eye row slightly recurved, eyes occupying about 1/3 of carapace width ( Fig. 17d View FIGURE 17 ).

Abdomen: 3.3 long; with moderate length sparse setae ( Fig. 17a, c View FIGURE 17 ).

Legs: Leg length ratio I>II>IV>III. Leg I femur 2.1, patella 1.0, tibia 1.6, metatarsus 1.3, tarsus 0.6; Leg II femur 2.1, patella 0.8, tibia 1.7, metatarsus 1.0, tarsus 0.6. Leg III; femur 1.4, patella 0.7, tibia 1.3, metatarsus 0.8, tarsus 0.4. Leg IV femur 2.0, patella 0.9, tibia 1.5, metatarsus 1.0, tarsus 0.4. Femur I bowed in dorsal view. Macrosetae: Leg I Femur dp2ap; tibia pv1-1-1-1-1-1ap, rv1-1-1-1-1-1ap; metatarsus 2-2-2-2-2-2-2. Leg II femur dp1ap; tibia p1-1-1ap, v1-1-1-1-1ap; metatarsus 2-2-2-2-2-2-2. Leg IV femur d1-1/0; tibia p1ap, v1-1; metatarsus rv1-1- 1-1/0-1ap. Retrolateral distal preening comb with 8 spines ( Fig. 17e View FIGURE 17 ). STC I, II with 7 teeth, ITC with small tooth. Tarsi with distal ventral scopulose setae.

Pedipalp: with dense setae, dense macrosetae clustered prolaterally on tibia and tarsus, pedipalp claw bare.

Genitalia: Anterior receptaculum bilobed, slightly sinuous in ventral view ( Fig. 18a–b View FIGURE 18 ).

Variation. Specimens examined showed variation in the number of macrosetae dorsally on the femur (3–5 macrosetae); and on the number on tibia and metatarsus I (range 16–19 macrosetae). There was no variation exhibited in the preening comb on metatarsus IV. Macrosetae of other legs were more variable. Specimens showed little variation in colour, or in size.

Distribution. Known only from Kunanyi / Mount Wellington, south west Tasmania ( Fig. 19 View FIGURE 19 ).