Weintrauboa chikunii Hormiga, 2003

Hormiga, Gustavo, 2003, Weintrauboa, a new genus of pimoid spiders from Japan and adjacent islands, with comments on the monophyly and diagnosis of the family Pimoidae and the genus Pimoa (Araneoidea, Araneae), Zoological Journal of the Linnean Society 139 (2), pp. 261-281 : 276-277

WEINTRAUBOA CHIKUNII (OI) NEW COMBINATION

Labulla contortipes chikunii Oi, 1979: 330 , figures 9– 12. Chikuni, 1989: 48, figure 12.

Labula chikunii Eskov, 1992: 53 (lapsus calami; elevated from subspecies of Labulla contortipes ).

N.B. Marusik et al. (1993: 75) synonymized Labulla chikunii Oi, 1979 with Lepthyphantes insularis Saito. This synonymy is rejected here. Tanasevitch & Eskov (1987: 194) had stated that Lepthyphantes insularis Saito , described after a single female specimen from the Sakhalin Island, did not belong in Lepthyphantes , based on Saito’s (1935: fig. 1b) epigynum illustration (Tanasevitch & Eskov did not provide any new illustrations or redescription of insularis , nor did they examine the type). In their view, Lepthyphantes insularis should probably be transferred to Labulla , and it could be a (junior) synonym of L. thoracica , though they did not formalize any transfer or new synonymy. Oi (1979) described and illustrated both sexes of Labulla contortipes chikunii . Saito’s type material, formerly at the University of Hokkaido, is presumably lost (H. Ono, unpubl. data). I have not been able to study any female specimens of chikunii (none was available for study), but Oi’s illustration of the chikunii epigynum, as well as Chikuni’s (1989: fig. 12) excellent colour photograph, shows substantial differences with Saito’s (1935) epigynum illustration. In Lepthyphantes insularis the ventral scape is very short and wide, and the posterior edges of the ventral epigynal wall curve posteriorly. The comparable structure in chikunii is much longer and thinner and the posterior edges of the ventral epigynal wall curve first anteriorly before descending towards the epigastric furrow. In addition, the leg formula in insularis is 4123, whereas in chikunii it is 1243. As Marusik et al. (1993) did not base their synonymy on examination of types, and the descriptions of these two species are quite different, on the basis of the available evidence it is unjustified to synonymize Labulla contortipes chikunii with Lepthyphantes insularis .

Types

Oi’s types (male holotype and one female paratype) are apparently lost (H. Ono, unpubl. data).

Diagnosis

See diagnosis of W. contortipes . Description

Male (from Juzhno-Sakhalinsk, Sakhalin Island). Cephalothorax 2.93 long, 1.99 wide, 1.95 high. Sternum 1.64 long, 1.33 wide. Abdomen (poorly preserved, no accurate width measurement possible) 3.74 long. AME diameter 0.20. Clypeus height 1.50 times one AME diameter. Chelicerae with three prolateral and four retrolateral teeth. Femur I 3.08 long, 1.05 times the length of cephalothorax. Metatarsus proximal third enlarged and sinuous, with a row of enlarged macrosetae ( Fig. 3I,J ). Metatarsus I trichobothrium 0.20. Pedipalp as in Figures 2A–D , 6A–D . Pedipalpal tibia with one prolateral and one retrolateral trichobothria.

Female. No specimens were available for study. The epigynum has been illustrated by Oi (1979: fig. 12) and photographed by Chikuni (1989: fig. 12).

Variation

Male cephalothorax ranges in length from 2.22 to 2.93 (n = 2). An additional male specimen measured 4.91 in total length. The male in illustrated in Chikuni (1989: fig. 12) shows a metatarsus I with a more subtle basal process than the specimens studied here and a conspicuous dark median band (very subtle in the specimens I examined). The Sakhalin Island specimens that I have studied have shorter legs than those described in Oi (1979; Femur I is 1.48 times the length of cephalothorax) and Chikuni (1989; Femur I is 1.8 times the length of cephalothorax).

Distribution

Recorded from Horigane (Nagano-ken Pref.) ( Oi, 1979) and Sakhalin island ( Marusik et al., 1993).

Material examined

Russia, Sakhalin Island, Juzhno-Sakhalinsk, Tourist valley , 18.x.1985, A.M. Basarukin, 2 males (handwritten label in Russian; KEPC) .

Figures

Figure 2. Weintrauboa chikunii (Oi) n. comb. (A–D), W. contortipes (Karsch) n. comb. (E–F). A–F, male palp, from Juzhno-Sakhalinsk, Sakhalin Island, Russia; E,F, epigynum, Mt Takiyama, Nagi-cho, Katsuta-gun, Okayama Pref., Japan. A, mesal; B, ectal; C, dorsal; D, cymbium, apical; E, ventral; F, lateral. Scale bars, 0.5 mm (A–D), 0.25 (E,F).

Figure 3. Weintrauboa contortipes (Karsch) n. comb. (A–H), W. chikunii (Oi) n. comb. (I,J). A, epigynum (cleared), dorsal; B, epigynum (cleared), ventral; C, epigynum (cleared), dorsal (schematic); D, prosoma, dorsal; E, prosoma, ventral; F, prosoma, anterior; G, male first leg, lateral; H, male first metatarsus, dorsal; I, male first leg, lateral; J, male first metatarsus, dorsal. Scale bars, 0.1 mm (A–C), 0.5 (D–F, H,J), 1.0 (G,I).

Figure 6. Weintrauboa chikunii (Oi) (A–D), W. contortipes (Karsch) (E,F). A, paracymbium and pimoid cymbial sclerite, ectal; B, detail tegular division, ectal; C, cymbial process; D, cymbial cuspules; E, male epiandrous fusules; F, male epiandrous fusules, detail.