Atypena formosana, (OI, 1977)

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 : 538-540

ATYPENA FORMOSANA ( OI, 1977)

( FIGS 7H , 67I , 68I , 73 )

Callitrichia formosana Oi, 1977: 23 , figs 1–5 (Dmf).

Oedothorax formosanus Brignoli, 1983: 349 .

Callitrichia formosana Song, 1987: 144 , fig. 104 (Tmf from Oedothorax ).

Atypena formosana Tazoe, 1992: 212 , figs 1–10 (mf; NB: generic placement following Jocqué, 1983).

Oedothorax formosanus Okuma et al., 1993: 13 , fig. 11A–B (f).

Atypena formosana Barrion & Litsinger, 1994: 319 , figs 1673–1676 (mf).

Callitrichia formosana Song et al., 1999: 160 , fig. 88K–L (mf).

Callitrichia formosana Ono et al., 2009: 267 , figs 95–99 (mf).

Examined material: Japan: Okinawa, Iromotejima Island, Urauchi , 2♂ 3♀ 02.iv.1995, leg. A. Tanikawa, det. A, Tanasevitch ( SMF 56485) .

Diagnosis:

Males: This species can be distinguished from A. cirrifrons by the proportionally shorter distal suprategular apophysis and ventral radical process.

Females: No study of Atypena comparative female morphology exists to date; such diagnosis is, therefore, beyond the scope of the current study.

Description:

Male ( SMF): Total length: 1.76. Prosoma: 0.78 long, 0.62 wide, PME region largely elevated, interocular region with translucent setae laterally curved ( Fig. 7H ). Eyes: AME-AME: 0.03, AME width: 0.06, AME- ALE: 0.05, ALE width: 0.08, ALE-PLE: 0.01, PLE width: 0.08, PLE-PME: 0.14, PME width: 0.07, PME- PME: 0.17. Clypeus: upper-half hirsute, one sub- AME seta. Sternum: 0.46 long, 0.46 wide. Chelicerae: mastidia absent; stridulatory striae imbricated, rows compressed proximally ( Fig. 67I ). Legs: tibia chaetotaxy 2-2-1-1, dorsal proximal macroseta on tibia I, II, III and IV 0.65, 0.82, 1.45 and 1.87 times diameter of tibia, respectively; Tm I: 0.78. All metatarsi with trichobothrium. Pedipalp: patella prolateral proximal vertical macrosetae absent; tibia with one prolateral, two retrolateral trichobothria; TPA short, pointed and sclerotized at tip; PC base not visible from dorsal view, distal setae close to distal clasp, terminal part slightly enlarged, distal clasp without striae, clasp extended apically ( Fig. 73A ); T without papillae; PT small, without papillae; TS long and slender, without papillae ( Fig. 73D ); MSA absent; DSA wide, truncated at tip, ventral corner more extended than dorsal corner ( Fig. 73A ); EM broad and flat, without papillae, exceeding ARP; ARP flat, unsclerotized; LER retrolateral to E; VRP long, slender; R without papillae; TP long, slender; E short and stout, slightly retrolaterally curved ( Fig. 73B ). Opisthosoma: dorsal pattern see Fig. 68I ; PMS with mAP, three AC; PLS with triad, 3+ AC.

Female ( SMF): See also Oi (1977); epigyne without prominent external modification, copulatory ducts slightly curved, trojactory simple, entrances to spermathecae mesal to exits of fertilixation ducts. ( Fig. 73 ). Opisthosoma: dorsal pattern same as male; PMS with CY, mAP, 2–4 AC; PLS with triad, 2 CY, 3+ AC ( Fig. 73 ).

Distribution: Bangladesh to Japan.

Remarks: As in A. cirrifrons , a scaly sac-like structure is observed at the paracymbial base ( Figs 73A, C , 74A, C ). According to the results of our phylogenetic analysis, and the similarities in male genital organs and prosomal modifications, this species is congeneric with A. cirrifrons .

ADDITIONAL MORPHOLOGICAL DATA

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 73. Atypena formosana (Oi, 1977). A–D, male left palp. A, retrolateral view. B, prolateral view. C, dorsal view. D, ventral view. E, apical view. E, F, epigyne. E, ventral view. F, external morphology. G, female spinnerets, first individual, dorsal view. H, female posterior median spinnerets, second individual, dorsal view. I, female posterior median spinnerets, first individual, ventral view. Scale bar 0.1 mm.

Figure 74. Atypena cirrifrons (Heimer, 1984). A–E, male right palp, images flipped horizontally. A, retrolateral view. B, prolateral view. C, dorsal view. D, ventral view. E, apical view. F, male right posterior lateral spinneret and posterior median spinnerets. Scale bar 0.1 mm.