Oedothorax uncus, TANASEVITCH, 2015 INCERTAE

Lin, Shou-Wang, Lopardo, Lara & Uhl, Gabriele, 2022, Evolution of nuptial-gift-related male prosomal structures: taxonomic revision and cladistic analysis of the genus Oedothorax (Araneae: Linyphiidae: Erigoninae), Zoological Journal of the Linnean Society 195, pp. 417-584 : 556-559

‘OEDOTHORAX’ UNCUS TANASEVITCH, 2015 INCERTAE SEDIS

( FIGS 19B , 22B , 24B , 81 )

Oedothorax uncus Tanasevitch, 2015: 393 , figs 86–88 (Dmf).

Type material: Holotype: India: Meghalaya, Khasi Hills, Mawphlang, 1800 m, forest, sifting litter, ♂ 28.x.1978, leg. C. Besuchet & I. Löbl ( MHNG, examined) . Paratype: 1♀, collected together with the holotype ( MHNG, examined) .

Diagnosis:

Males: This species can be distinguished by the long, hook-shaped VRP, the long, palpal tibial apophysis with distal dentation and the lack of prosomal modification.

Females: This species can be identified by the enlarged median part of copulatory ducts.

Description:

Male (holotype): Total length: 2.20. Prosoma: 0.99 long, 0.8 wide, unmodified; interocular region with short stout setae directed upwards ( Fig. 19B ). Eyes: AME-AME: 0.04, AME width: 0.05, AME-ALE: 0.03, ALE width: 0.08, ALE-PLE: 0.01, PLE width: 0.08, PLE-PME: 0.06, PME width: 0.06, PME-PME: 0.08. Clypeus: not hirsute, one sub-AME seta. Sternum: 0.61 long, 0.59 wide. Chelicerae: mastidia absent; stridulatory striae ridged, rows compressed and evenly spaced ( Fig. 22B ). Legs: tibia chaetotaxy 2-2-1-1, dorsal proximal macroseta on tibia I, III and IV 1.35, 2.55 and 2.94 times diameter of tibia, respectively; Tm I: 0.65. All metatarsi with trichobothrium. Pedipalp: patella prolateral proximal vertical macrosetae absent; tibia with one prolateral, two retrolateral trichobothria; TPS absent; TPA prominent, dorso-retrolaterally directed, with several enlarged setal bases at tip; TRA absent ( Fig. 81C ); PC median-sized, base not visible from dorsal view, distal setae close to distal clasp, distal clasp without striae, clasp directed apically ( Fig. 81A ); T without papillae; PT median-sized papillae; TS absent ( Fig. 81D ); MSA present; DSA tip wavy ( Fig. 81A ); EM flat, length approximately equals ARP, with long papillae ( Fig. 81D ); ARP flat, weakly sclerotized; LER absent; VRP long, dorsally curved, tip pointed, proximally directed; TP tip round, dorsally directed; E retrolaterally spiral, anterior margin at base slightly wavy ( Fig. 79B ). Opisthosoma: dorsal pattern see Fig. 24B ; PMS with mAP, AC absent; PLS with triad, one AC ( Fig. 81G, H ).

Female (paratype): Total length: 2.28. Prosoma: 1.01 long, 0.78 wide. Eyes: AME-AME: 0.04, AME width: 0.04, AME-ALE: 0.02, ALE width: 0.09, ALE- PLE: 0.01, PLE width: 0.08, PLE-PME: 0.05, PME

width: 0.08, PME-PME: 0.06. Clypeus: not hirsute, one sub-AME seta. Sternum: 0.58 long; 0.61 wide. Legs: tibia chaetotaxy 2-2-1-1, dorsal proximal macroseta on tibia I and IV 2.28 and 3.44 times diameter of tibia, respectively; Tm I: 0.60. Epigyne: Clade 13 characteristic morphology, CO posteriorly oriented, middle part of copulatory ducts enlarged, entrances of copulatory ducts into spermathecae ectal to exits of fertilization ducts ( Fig. 81E, F ). Opisthosoma: dorsal pattern same as male; PMS with mAP, one CY; PLS with triad, two CY, one AC ( Fig. 81I, J ).

Distribution: India, only known from the type locality.

Habitat: Forest litter.

Remarks. According to the results of our phylogenetic analysis and the lack of the distinctive characteristics of Oedothorax s.s., this species is more closely related to Atypena , some ‘ Oedothorax ’ incertae sedis species and Mitrager , which, as in this species, are distributed in the Himalayan region and the Oriental realm. We provisionally leave the taxonomic status of this species unchanged until further data become available.

Figures

Figure 19. Male prosomal morphology, lateral. A, ‘Oedothorax’ meghalaya Tanasevitch, 2015 (traced from photograph). B, ‘Oe.’ uncus Tanasevitch, 2015 (traced from photograph). C, Holmelgonia basalis Jocqué & Scharff, 1986 (Jocqué & Scharff, 1986, fig. 18). D, Callitrichia holmi (Wunderlich, 1978) (traced from photograph). E, Ca. picta (Caporiacco, 1949) (Holm 1962, fig. 58). F, Ca. gloriosa (Jocqué, 1984) (traced from photograph). G, Ca. convector Tanasevitch, 2014 (traced from photograph). H, Ca. sellafrontis Scharff, 1990 (traced from photograph). I, Ca. juguma (Scharff, 1990) (Scharff 1990a, fig. 164). J, Ca. uncata (Jocqué & Scharff, 1986) (Jocqué & Scharff, 1986, fig. 130). K, Ca. pilosa (Wunderlich, 1978) (traced from photograph). L, Ca. usitata (Jocqué & Scharff, 1986) (traced from photograph). M, Ca. legrandi (Jocqué, 1985) (Jocqué, 1985, fig. 21). N, Ca. macrophthalma (Locket & Russell-Smith, 1980) (traced from photograph). O, Ca. muscicola (Bosmans, 1988) (traced from photograph). P, Ca. latitibialis (Bosmans, 1988) (traced from photograph). Q, Ca. longiducta (Bosmans, 1988) (traced from photograph). R, Nasoona setifera (Tanasevitch, 1998) (Tanasevitch, 1998a, fig. 3). S, N. crucifera (Thorell, 1895) (Tu & Li, 2004, fig. 6A).

Figure 22. Male chelicerae, stridulatory striae on lateral side. A, ‘Oedothorax’ meghalaya. B, ‘Oe.’ uncus. C, Holmelgonia basalis. D, Callitrichia holmi. E, Ca. picta. F, Ca. gloriosa. G, Ca. convector. H, Ca. sellafrontis. I, Ca. juguma. J, Ca. uncata. K, Ca. pilosa. L, Ca. usitata. M, Ca. legrandi. N, Ca. macrophthalma. O, Ca. muscicola. P, Ca. latitibialis. Q, Ca. longiducta. R. Nasoona setifera. S, N. crucifera. Scale bars 0.05 mm.

Figure 24. Male opisthosoma, dorsal view. A, ‘Oedothorax’ meghalaya Tanasevitch, 2015. B, ‘Oe.’ uncus Tanasevitch, 2015. C, Holmelgonia basalis Jocqué & Scharff, 1986. D, Callitrichia holmi (Wunderlich, 1978). E, Ca. picta (Caporiacco, 1949). F, Ca. gloriosa (Jocqué, 1984). G, Ca. convector Tanasevitch, 2014. H, Ca. sellafrontis Scharff, 1990. I, Ca. juguma (Scharff, 1990). J, Ca. uncata (Jocqué & Scharff, 1986). K, Ca. pilosa (Wunderlich, 1978). L, Ca. usitata (Jocqué & Scharff, 1986). M, Ca. legrandi (Jocqué, 1985). N, Ca. macrophthalma (Locket & Russell-Smith, 1980). O, Ca. muscicola (Bosmans, 1988). P, Ca. latitibialis (Bosmans, 1988). Q, Ca. longiducta (Bosmans, 1988). R, Nasoona setifera (Tanasevitch, 1998). S, N. crucifera (Thorell, 1895). Scale bars 0.1 mm.

Figure 79. ‘Oedothorax’ paracymbialis Tanasevitch, 2015. A–E, male right palp, images flipped horizontally.A, retrolateral view. B, prolateral view. C, dorsal view. D, ventral view. E, embolic division, prolateral view. F, male spinnerets. Scale bars 0.1 mm.

Figure 81. ‘Oedothorax’ uncus Tanasevitch, 2015. A–D, male right palp, images flipped horizontally. A, retrolateral view. B, prolateral view. C, dorsal view. D, ventral view. E, F, epigyne. E, ventral view. F, external morphology. G, H, male posterior median spinnerets and posterior lateral spinnerets. G, lateral view. H, dorsal view. I, female spinnerets. J, female posterior median spinnerets and posterior lateral spinnerets. Scale bars 0.1 mm.