Utivarachna kinabaluensis Deeleman-Reinhold, 2001

Yamasaki, Takeshi, Hashimoto, Yoshiaki, Endo, Tomoji, Hyodo, Fujio, Itioka, Takao, Mohamed, Maryati & Meleng, Paulus, 2023, Taxonomic study of Bornean species of Utivarachna Kishida, 1940 (Araneae: Trachelidae), with the description of a new species, Zootaxa 5343 (1), pp. 55-73 : 70-73

Utivarachna kinabaluensis Deeleman-Reinhold, 2001

Figs 24–27

Utivarachna kinabaluensis Deeleman-Reinhold, 2001: 381 , figs 593–597.

Type material examined. Holotype ♁ ( RMNH.ARA. 15219; Fig. 24E ), N. Borneo, Kinabalu National Park , HQ, alt. 1550 m, 21–27.VII.1980., Coll. Deeleman, leg. C.L. & P. R. Deeleman . Paratype: 1 ♁ ( RMNH.ARA. 15244; Fig. 26E ), same data .

Diagnosis. Utivarachna kinabaluensis is similar to U. bucculenta Deeleman-Reinhold, 2001 and U. fanjing Li, Zhang & Yu, 2022 in having an apical RTA claw in males, and in copulatory organs. Regarding males, with the palp in retrolateral view, the RTA claw extends ventrally with a curved tip in U. kinabaluensis , whereas it extends anteriorly and is S-curved in U. bucculenta and extends dorsally without an apical curve in U. fanjing . Regarding females, the bursae are large and elongate oval, tapering terminally in U. kinabaluensis , whereas they are small and short tube-like in U. bucculenta , and large and long tube-like in U. fanjing .

Measurements (holotype ♁/ paratype ♀). Carapace length 3.15/2.90; cephalic width 0.91/1.72; thoracic width 2.35/2.13. Diameter of eyes: AME 0.18/0.17; ALE 0.20/0.18; PME 0.15/0.13; PLE 0.18/0.13. Interdistances between eyes: AME–AME 0.05/0.06; AME–ALE 0.13/0.15; ALE–ALE 0.67/0.67; PME–PME 0.22/0.25; PME– PLE 0.33/0.33; PLE–PLE 0.90/1.12; ALE–PLE 0.16/0.17; AME–PME 0.07/0.06. MOA: length 0.35/0.30; anterior width 0.38/0.40; posterior width 0.51/0.52. Clypeus height 0.42/0.41. Abdomen length 2.85/3.03; width 2.05/2.06. Legs: I 8.62 (2.46, 0.83, 2.20, 2.06, 1.07)/7.30 (2.16, 0.75, 1.77, 1.65, 0.97); II 7.90 (2.33, 0.87, 1.90, 1.80, 1.00)/6.41 (1.87, 0.75, 1.50, 1.47, 0.82); III 5.66 (1.70, 0.65, 1.22, 1.46, 0.63)/4.94 (1.45, 0.67, 1.00, 1.25, 0.57); IV 7.97 (2.30, 0.75, 1.85, 2.17, 0.90)/6.65 (1.86, 0.65, 1.52, 1.87, 0.75).

Male ( Fig. 24A–D ). Carapace entirely granulated, dorsally oval; AER almost straight in dorsal view; PER recurved in dorsal view; lateral margins of carapace strongly constricted between cephalic and thoracic parts; lateral margins of thoracic part weakly undulating. Chelicerae sparsely granulated, with five prolateral and five retrolateral teeth. Clypeus with small wedge-shaped projection between chelicerae. Pedicel short.Abdomen oval; entire dorsum and epigastric area sclerotized. Legs granulated; legs I and II elongated, with small cusps located ventrally from patella to tarsus.

Palp ( Fig. 25A–D ). Cymbium longer than wide, pear-shaped, with convex retrolateral margin. Bulb inverted pear-shaped; prolateral half weakly sclerotized with subtegulum. Embolus coils stored between cymbium and bulb. Sperm duct U-curved in posterior part of bulb, running retrolaterally to dorsal side with weak curve. RTA strongly extended, apically developed in semi-transparent plate with long apical claw.

Coloration and setation ( Fig. 24A–D ). Carapace dark brown, covered with fine setae. Chelicerae dark brown, covered with fine setae; prolateral margin with long setae. Abdomen covered with fine setae; sclerotized dorsum dark brown, and epigastric area brown. Legs brown to light brown, covered with fine setae.

Female ( Fig. 26A–D ). Somatic characteristics almost same as in male. Legs less granulated, without distinct ventral cusps in legs I and II.

Copulatory organs ( Fig. 27A–C ). Copulatory atrium almost as long as wide. Copulatory openings located at anterior corner of atrium; copulatory ducts extending towards anterior, with strong curvature and then helical coiling. Bursae inverted pear-shaped, extending posteriorly, tapering. Spermathecae almost oval. Fertilization ducts straight, extending posteriorly.

Coloration and setation ( Fig. 26A–D ). Almost same as in male.

Distribution. Sabah (known only from the type locality).

Remarks. Although U. kinabaluensis belongs to the kinabaluensis -group, this species is very similar to U. galyaniae , which belongs to the fukasawana -group. The possibility of a synonymous relationship between the two species should be considered in a future study based on the type material of U. galyaniae .

Figures

FIGURE 24. Utivarachna kinabaluensis Deeleman-Reinhold, 2001, male, holotype (RNMH.ARA.15219).A habitus, dorsal view; B same, ventral view; C cephalic part and chelicerae, frontal view; D leg I, left, prolateral view; E label. Scale bars A–D: 1 mm.

FIGURE 25. Utivarachna kinabaluensis, male, holotype (RNMH.ARA.15219). A right palp, retrolateral view; B same, ventral view; C same, prolateral view; D same, dorsal view. Scale bars: 0.50 mm. E—embolus, Sd—sperm duct, St—subtegulum.

FIGURE 26. Utivarachna kinabaluensis Deeleman-Reinhold, 2001, female, paratype (RNMH.ARA.15244). A habitus, dorsal view; B same, ventral view; C cephalic part and chelicerae, frontal view; D leg I, left, prolateral view; E label. Scale bars A–D: 1 mm.

FIGURE 27. Utivarachna kinabaluensis, female, paratype (RNMH.ARA.15244). A epigyne, ventral view; B internal organs, ventral view; C same, dorsal view. Scale bars: 0.50 mm. Br—bursa, Fd—fertilization duct, S—spermatheca.