Oedothorax stylus, 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 : 554

‘OEDOTHORAX’ STYLUS TANASEVITCH, 2015 INCERTAE SEDIS

( FIGS 7F , 67G , 68G , 80 )

Oedothorax stylus Tanasevitch, 2015: 393 , figs 83–85 (Dmf).

Type material: Holotype: India: Kerala, NW of Nelliampathi Hills, Kaikatty , 900 m, sifting in forest, neara spring, ♂ 30.xi.1972, leg. C. Besuchet & I. Löbl (examined) . Paratypes: India: 1♀, collected together with the holotype; Madras , Anaimalai Hills, 18 km north of Valparai, 1250 m, forest, sifting litter , 1♂ 18.xi.1972, leg. C. Besuchet & I. Löbl (examined).

Diagnosis:

Males: This species can be diagnosed by the scaly elevation representing palpal tibial prolateral apophysis, the exceptionally long and slender ventral radical process, and the lack of prosomal modification.

Females: The general appearance of this species is Oedothorax -like. It can be identified by the anterior position of the copulatory ducts opening to the spermathecae.

Description:

Male (paratype): Total length: 1.70. Prosoma: 0.77 long, 0.67 wide, unmodified ( Fig. 7F ). Eyes: AME-AME: 0.02, AME width: 0.05, AME-ALE: 0.02, ALE width: 0.08, ALE-PLE: 0.01, PLE width: 0.08, PLE-PME: 0.03, PME width: 0.08, PME-PME: 0.03. Clypeus: not hirsute, one sub-AME seta. Sternum: 0.48 long, 0.48 wide. Chelicerae: mastidia absent; stridulatory striae rows compressed proximally ( Fig. 67G ). Legs: tibia chaetotaxy 2-2-1-1, dorsal proximal macroseta on tibia I 1.56 times diameter of tibia; Tm I: 0.54. All metatarsi with trichobothrium. Pedipalp: patella prolateral proximal vertical macrosetae absent; tibia with one prolateral, two retrolateral trichobothria; TPS absent; TPA short, stout, apical surface scaly; TRA absent ( Fig. 80C ); PC median-sized, base not visible from dorsal view, distal setae close to distal clasp, distal clasp without striae, clasp directed apically ( Fig. 80A ); T without papillae; PT long, with median-sized papillae; TS absent ( Fig. 80D ); MSA present; DSA tip slightly wavy, with a protuberance on dorsal side in front of MSA; EM flat, anterior margin with papillae, length equals ARP ( Fig. 80A ); ARP pointed, weakly sclerotized; LER small, without striae, not extended dorsal to E; VRP long, straight, apically directed; TP tip pointed, narrow; E retrolaterally spiral, anterior margin at base wavy ( Fig. 80B ). Opisthosoma: dorsal pattern see Fig. 68G ; PMS with mAP, two AC; PLS with triad, 3+ AC ( Fig. 80G ).

Male (holotype): Prosoma: 0.77 long, 0.63 wide. Tm I: 0.54.

Female (paratype): Total length: 1.96. Prosoma: 0.85 long, 0.66 wide. Eyes: AME-AME: 0.02, AME width: 0.05, AME-ALE: 0.02, ALE width: 0.09, ALE-PLE: 0, PLE width: 0.09, PLE-PME: 0.04, PME width: 0.08, PME-PME: 0.05. Clypeus: not hirsute, one sub- AME seta. Sternum: 0.53 long; 0.51 wide. Legs: tibia chaetotaxy 2-2-1-1, dorsal proximal macroseta on tibia I, II, III and IV 2.72, 2.82, 2.60 and 3.39 times diameter of tibia, respectively; Tm I: 0.54. All metatarsi with trichobothrium. Epigyne: Clade 13 characteristic morphology, CO anteriorly oriented ( Fig. 80E, F ). Opisthosoma: dorsal pattern same as male; PMS with mAP, two AC, one CY; PLS with triad, two CY, 3+ AC ( Fig. 80H ).

Distribution: At present only known from Kerala and Madras (currently Tamil Nadu), India.

Habitat: Forest litter.

Remarks: According to the results of our phylogenetic analysis and the lack of the distinctive characteristics of Oedothorax s. s. (see general description of Oedothorax s.s.), this species is more closely related to ‘ Oe. ’ cunur and Atypena which, as in this species, are distributed in the Oriental realm. We provisionally leave the taxonomic status of this species unchanged until further data become available.

Figures

Figure 7. Male prosomal morphology, lateral.A, Emertongone montifera (Emerton, 1882) (Paquin & Dupérré, 2003, fig. 1187). B, Shaanxinus mingchihensis Lin, 2019 (traced from photograph). C, ‘Oedothorax’ paracymbialis Tanasevitch, 2015 (traced from photograph). D, ‘Oe.’ kodaikanal Tanasevitch, 2015 (traced from photograph). E, ‘Oe.’ cunur Tanasevitch, 2015 (traced from photograph). F, ‘Oe.’ stylus Tanasevitch, 2015 (traced from photograph). G, Atypena cirrifrons (Heimer, 1984) (traced from photograph). H, A. formosana (Oi, 1977) (Oi, 1977, fig. 2). I, ‘Oe.’ nazareti Scharff, 1989 (Scharff, 1989: fig. 7). J, Gongylidium rufipes (Linnaeus, 1758) (traced from photograph). K, Ummeliata insecticeps (Bösenberg & Strand, 1906) (Tu & Li 2004: fig. 8A). L, U. esyunini (Zhang, Zhang & Yu, 2003) (Zhang et al., 2003, fig. 2A). M, Hylyphantes graminicola (Sundevall, 1830) (traced from photograph). N, Tmeticus tolli Kulczyński, 1908 (traced from photograph). O, Oedothorax gibbosus (Blackwall, 1841) [Roberts, 1987: fig. 21 (e)]. P, Oe. trilobatus (Banks, 1896) (Bishop & Crosby, 1935: fig. 79). Q, Oe. gibbifer (Kulczyński, 1882) (Heimer & Nentwig, 1991: fig.604.5).R, Oe.apicatus (Blackwall, 1850) [Roberts, 1987: fig.23 (d)].S, Oe. retusus (Westring, 1851) [Roberts, 1987: fig. 23 (c)]. T, Oe. paludigena Simon, 1926 [Millidge, 1975: fig. (5)]. U, Oe. meridionalis Tanasevitch, 1987 (Tanasevitch, 1987: fig. 107).V, Oe. agrestis (Blackwall, 1853) (Roberts, 1987: fig. 23B).W, Oe. fuscus (Blackwall, 1834) (Roberts, 1987: fig. 23A). X, Oe. tingitanus (Simon, 1884) (Denis, 1968: fig. 11).

Figure 67. Male chelicerae, stridulatory striae on lateral side. A, Jilinus hulongensis (Zhu & Wen, 1980). B, Cornitibia simplicithorax (Tanasevitch, 1998). C, Emertongone montifera (Emerton, 1882). D, ‘Oedothorax’ paracymbialis Tanasevitch, 2015. E, ‘Oe.’ kodaikanal Tanasevitch, 2015. F, ‘Oe.’ cunur Tanasevitch, 2015. G, ‘Oe.’ stylus Tanasevitch, 2015. H, Atypena cirrifrons (Heimer, 1984). I, A. formosana (Oi, 1977). J, ‘Oe.’ nazareti Scharff, 1989. K, Gongylidium rufipes (Linnaeus, 1758). L, Ummeliata insecticeps (Bösenberg & Strand, 1906). M, U. esyunini (Zhang, Zhang & Yu, 2003). N, Hylyphantes graminicola (Sundevall, 1830). O, Tmeticus tolli Kulczyński, 1908. Scale bars 0.05 mm.

Figure 68. Male opisthosoma, dorsal view. A, Jilinus hulongensis (Zhu & Wen, 1980). B, Cornitibia simplicithorax (Tanasevitch, 1998). C, Emertongone montifera (Emerton, 1882). D, ‘Oedothorax’ paracymbialis Tanasevitch, 2015. E, ‘Oe.’ kodaikanal Tanasevitch, 2015. F, ‘Oe.’ cunur Tanasevitch, 2015. G, ‘Oe.’ stylus Tanasevitch, 2015. H, Atypena cirrifrons (Heimer, 1984). I, A. formosana (Oi, 1977). J, ‘Oe.’ nazareti Scharff, 1989. K, Gongylidium rufipes (Linnaeus, 1758). L, Ummeliata insecticeps (Bösenberg & Strand, 1906). M, U. esyunini (Zhang, Zhang & Yu, 2003). N, Hylyphantes graminicola (Sundevall, 1830). O, Tmeticus tolli Kulczyński, 1908. Scale bars 0.1 mm.

Figure 80. ‘Oedothorax’ stylus 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, ventrolateral view. F, external morphology. G, male posterior median spinnerets and posterior lateral spinnerets, dorsal view. H, female spinnerets. Scale bars 0.1 mm.