Utivarachna rubra 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 : 61-63

Utivarachna rubra Deeleman-Reinhold, 2001

Figs 8–11

Utivarachna rubra Deeleman-Reinhold, 2001: 391 , figs 620–622.

Type material examined. Holotype ♁ ( RMNH 15184 ) and paratype ♀ ( RMNH 15184 ). Label data for both shown in Fig. 8E . Data according to Deeleman-Reinhold (2001): 02º02’S, 113º40’E, Kaharian, C. Kalimantan , 2–16.IX.1985, leg. S. Djojosudharmo.

Other material. 2 ♁ ( LMB-TY20180829 -TR04, LMB-TY20180829 -TR05), 2 ♀ ( LMB-TY20180829 -TR02, LMB-TY20180829 -TR03), Sungai Liku [Liku River], Lambir Hills National Park, Sarawak, 29.VIII.2018, leg. T. Yamasaki; 1 ♁ (LCo20090227-E3, MNHAH), Walk-way (beyond second tower), 27.II.2009, Lambir Hills National Park, Sarawak, leg. T. Endo .

Diagnosis. See Diagnosis of U. itiokai sp. nov. and U. dusun .

Measurements (holotype ♁/ paratype ♀). Carapace length 1.52/1.35; cephalic width 0.78/0.68; thoracic width 1.10/0.96. Diameter of eyes: AME 0.11/0.08; ALE 0.12/0.12; PME 0.10/0.11; PLE 0.11/0.11. Interdistances between eyes: AME–AME 0.03/0.02; AME–ALE 0.02/0.01; ALE–ALE 0.28/0.23; PME–PME 0.10/0.08; PME– PLE 0.10/0.07; PLE–PLE 0.47/0.43; ALE–PLE 0.08/0.06; AME–PME 0.05/0.03. MOA: length 0.28/0.26; anterior width 0.25/0.22; posterior width 0.30/0.28. Clypeus height 0.27/0.21. Abdomen length 1.45/1.47; width 1.01/1.13. Legs: I 3.83 (1.25, 0.50, 0.93, 0.63, 0.52)/3.22 (1.01, 0.37, 0.75, 0.61, 0.48); II 3.25 (0.96, 0.37, 0.72, 0.73, 0.47)/2.95 (0.88, 0.31, 0.66, 0.65, 0.45); III 2.56 (0.75, 0.30, 0.52, 0.62, 0.37)/2.29 (0.66, 0.28, 0.47, 0.55, 0.33); IV 3.23 (0.90, 0.33, 0.72, 0.85, 0.43)/3.02 (0.85, 0.28, 0.68, 0.80, 0.41).

Male ( Fig. 8A–D ). Carapace oval and superficially granulated with truncated posterior end. Thoracic lateral margins hardly undulating. AER slightly recurved. PER longer than AER, almost straight. Fovea shallow, indistinct. Clypeus margin with small projection that truncated or weakly bifurcated. Chelicerae superficially granulated, with three teeth on each prolateral and retrolateral margin. Pedicel short. Abdomen oval; entire dorsum weakly sclerotized. Legs superficially granulated; leg I enlarged, bearing cusps ventrally.

Palp ( Fig. 9A–D ). Cymbium oval. Bulb oval. Sperm duct U-shaped, visible through posterior tegulum. Embolus coiled at horizontal plane; embolus coil plane inclining dorsally, covered by cymbium; basal embolus part accompanied by sclerotized plate located in middle and anterior parts of tegulum. RTA long; anterior half of RTA strongly curved dorsally.

Coloration and setation ( Fig. 8A–D ). Carapace brown. Chelicerae brown. Abdomen covered with fine setae; dorsal sclerotized surface pale amber-colored; lateral and ventral surfaces cream, tinged with black.

Female ( Fig. 10A–D ). Somatic characteristics almost identical to diagnosis characteristics of U. dusun group (described above). Chelicerae with three prolateral and two retrolateral teeth. Abdomen oval, without distinct dorsal scutum. Leg I robust but weaker than that of male; ventral side covered with sparse cusps; ventral depression at proximal end of metatarsus indistinct.

Copulatory organs ( Fig. 11A–C ). Copulatory atrium wider than long, with sclerotized lateral margins.Copulatory ducts wide anteriorly, gradually tapering posteriorly, forming complicated loops. Bursae slender pear-shaped, with spherical terminals. Spermathecae tube-like shaped, with long narrow fertilization ducts extending posteriorly.

Coloration and setation ( Fig. 10A–D ). Almost same as in male, except for grayish abdomen.

Distribution. Central Kalimantan, Sarawak.

Figures

FIGURE 8. Utivarachna rubra Deeleman-Reinhold, 2001, male, holotype (RNMH.ARA.15184). 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 and B, 1 mm; C and D, 0.50 mm.

FIGURE 9. Utivarachna rubra, male, holotype (RNMH.ARA.15184). A left palp, prolateral view; B same, ventral view; C same, retrolateral view; D same, dorsal view. Scale bars: 0.50 mm. E—embolus, Sd—sperm duct, St—subtegulum.

FIGURE 10. Utivarachna rubra Deeleman-Reinhold, 2001, female, paratype (RNMH.ARA.15184). A habitus, dorsal view; B same, ventral view; C cephalic part and chelicerae, frontal view; D left leg I, prolateral view. Scale bars: A and B, 1 mm; C and D, 0.50 mm.

FIGURE 11. Utivarachna rubra, female, paratype (RNMH.ARA.15184). 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.