Utivarachna kinabaluensis Deeleman-Reinhold 2001
Creators: name: Yamasaki, Takeshi
name: Hashimoto, Yoshiaki
name: Endo, Tomoji
name: Hyodo, Fujio
name: Itioka, Takao
name: Mohamed, Maryati
name: Meleng, Paulus
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Trachelidae
Utivarachna
Utivarachna kinabaluensis

description: 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.
description: Published as part of 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, pp. 55-73 in Zootaxa 5343 (1) on pages 70-73, DOI: 10.11646/zootaxa.5343.1.3, http://zenodo.org/record/8324250