Ariadna muscosa Hickman, 1929

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 : 179-182

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.6335877
persistent identifier	https://treatment.plazi.org/id/784D6052-FFC4-FF91-AFB5-F966FD0BFDE1
treatment provided by	Plazi
scientific name	Ariadna muscosa Hickman, 1929
status

Treatment

Ariadna muscosa Hickman, 1929 View in CoL

Figs 19 View FIGURE 19 , 24a–h, 24a–c View FIGURE 24

Ariadna muscosa Hickman, 1929: 103–106 View in CoL , figs 3A–C.

Type material. Holotype ♂. AUSTRALIA: Tasmania: Launceston, north Tasmania, 17 May 1928, 41.45°S, 147.17°E, Launceston ( QVMAG QVM:13:7339). GoogleMaps

Paratype ♀. Same data as holotype ( QVMAG QVM:13:7339). Only images examined of paratype and holotype GoogleMaps .

Other material examined. Australia: Tasmania: 1 ♂, Launceston, Punchbowl , in moss, 41.45°S; 147.20°E, 01 June 1931 ( AM KS.034878) GoogleMaps ; 3 ♂, Launceston, Cataract Gorge , ex pitfall trap, site 4, 41.44°S, 147.11°E; 31 December 2001, Migas plomleyi survey ( QVMAG QVM:2020:13:0110) GoogleMaps .

Diagnosis. Ariadna muscosa is closest to A. crypticola sp. nov., A. ferrogrisea sp. nov. and A. subnubilum sp. nov.. It can be differentiated from A. crypticola sp. nov. by the less pronounced prolateral projection on the cymbium, by the longer and thinner pedipalp tibia and by the embolus, which lacks a defined apical hook in A. muscosa ( Fig. 25a–c View FIGURE 25 cf. Fig. 14a–c View FIGURE 14 ); it can also be distinguished by having seven macrosetae in the preening comb on metatarsus IV, compared to five macrosetae in A. crypticola sp. nov. Ariadna muscosa can be distinguished from A. ferrogrisea by the pattern and lesser number of macrosetae on the tibia and metatarsus of leg I ( Fig. 24f–h View FIGURE 24 cf. Fig. 15f–h View FIGURE 15 ) and by the shape of the pedipalp cymbium, which has a more pronounced prolateral extension in A. ferrogrisea sp. nov. ( Fig. 25c View FIGURE 25 cf. Fig. 16c View FIGURE 16 ). The species can be differentiated from A. subnubilum sp. nov. by the lack of transverse abdominal markings in A. subnubilum sp. nov. ( Fig. 24a View FIGURE 24 cf. Fig. 31a View FIGURE 31 ); by the greater width compared to length of the pedipalp tibia of A. subnubilum sp. nov. ( Fig. 25a, b View FIGURE 25 cf. Fig. 32a, b View FIGURE 32 ) and supported by molecular sequencing, with an interspecific divergence of 11.6% ( Table 2 View TABLE 2 ).

Description. ♂ (based on AM KS.034878). Total length 5.2.

Colour in ethanol: Carapace orange brown, with faint pallid areas extending out from fovea, sparse brown setae. Sternum orange brown, lighter towards the centre; with scattered sparse, long dark setae; labium red, fading to pale cream anteriorly; maxillae and chelicerae red brown.Abdomen dorsally dark grey, with faint, narrow white striations posteriorly, ventrally dark grey, darker medially. Legs golden yellow-brown, with sparse brown setae ( Fig. 24a–h View FIGURE 24 ).

Cephalothorax: 2.4 long, 1.7 wide. Carapace oval, with a broad neck anteriorly, edges gently undulating and rebordered, fovea a shallow indentation ( Fig. 24a View FIGURE 24 ), from lateral view carapace raised slightly, highest mid-way between fovea and eye group ( Fig. 24c View FIGURE 24 ). 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. 24b View FIGURE 24 ). Posterior eye row recurved, eye group occupying 0.6 of carapace width ( Fig. 24d View FIGURE 24 ).

Abdomen: 2.8 long; with covering of sparse fine macrosetae ( Fig. 24a View FIGURE 24 ).

Legs: Leg length ratio: I>II>IV>III. Leg I femur 1.9, patella 0.7, tibia 1.6, metatarsus 1.4, tarsus 0.7; Leg II femur 2.0, patella 0.6, tibia 1.5, metatarsus 0.8, tarsus 0.5; Leg III femur 1.5, patella 0.5, tibia 1.1, metatarsus 0.9, tarsus 0.5; Leg IV femur 1.7, patella 0.7, tibia 1.2, metatarsus 1.0, tarsus 0.5. Femur I bowed in dorsal view. Macrosetae: Leg I femur d1, dp2ap; tibia p1-1, pv1-1-1-1ap, rv1-1-1-1ap, r1-1-1; metatarsus pv1-1-1-1ap, rv1-1-1ap. Leg II femur d1, dp1ap; tibia p1-1-2, pv1ap, rv1-1-1-1ap, r1; metatarsus p1-1-1ap, r1-1-1ap. Leg IV femur d1-1, dp1ap; tibia p1-1, pr1ap, v1-1, metatarsus 1-1-1ap, rv2-1. Retrolateral distal preening comb with 7 spines. STC I, II with 9 teeth ( Fig. 24e View FIGURE 24 ), ITC with small tooth. Tarsi with sparse distal ventral scopulose setae.

Pedipalp: Tibia 1.4 times the length of the cymbium; cymbium rounded square shape, with not well defined anterior prolateral extension, scopulose setae anteriorly; bulb pyramidal in lateral view, embolus long, thin with slight hook apically ( Fig. 25a–c View FIGURE 25 ).

Distribution. From localities around Launceston, in northern Tasmania ( Fig. 19 View FIGURE 19 ).

Variation. There was little variation in the material examined. The embolus of each specimen was characteristic, lacking an apical hook.

DNA barcode. A 653 base-pair (bp) fragment of the mitochondrial (mt) DNA cytochrome c oxidase I (COI) gene (DNA barcode) was sequenced for specimen QVM:2020:13:0110 (see other material information above) and is deposited in BOLD (Process ID OZBOL2576-21) and GenBank (accession number ####). The base composition of the DNA barcode sequence is 19.9% A, 40.58% T, 12.86% C and 26.65% G (G + C = 39.51).

Remarks. The holotype and paratype of A. muscosa were examined by images provided by J. Douglas, QVMAG, and could not be measured and examined in detail. We here provide a redescription based on more recently collected material that is representative of this species.