Taxonomic study of Bornean species of Utivarachna Kishida, 1940 (Araneae: Trachelidae), with the description of a new species Author Yamasaki, Takeshi 0000-0002-2419-188X Institute of Natural and Environmental Sciences, University of Hyogo, Yayoigaoka 6, Sanda-shi, Hyogo 669 - 1546, Japan & Museum of Nature and Human Activities, Hyogo, Yayoigaoka 6, Sanda-shi, Hyogo 669 - 1546, Japan & k 0468874 @ gmail. com; https: // orcid. org / 0000 - 0002 - 2419 - 188 X k0468874@gmail.com Author Hashimoto, Yoshiaki 0000-0002-6696-5011 Institute of Natural and Environmental Sciences, University of Hyogo, Yayoigaoka 6, Sanda-shi, Hyogo 669 - 1546, Japan & Museum of Nature and Human Activities, Hyogo, Yayoigaoka 6, Sanda-shi, Hyogo 669 - 1546, Japan & aenictus @ mac. com; https: // orcid. org / 0000 - 0002 - 6696 - 5011 aenictus@mac.com Author Endo, Tomoji 0009-0007-8279-9897 School of Human Sciences, Kobe College, Okadayama 4 - 1, Nishinomiya, Hyogo, 662 - 8505, Japan & endo @ mail. kobe-c. ac. jp; https: // orcid. org / 0009 - 0007 - 8279 - 9897 endo@mail.kobe-c.ac.jp Author Hyodo, Fujio 0000-0001-8344-9353 Research Core for Interdisciplinary Sciences, Okayama University, 3 - 1 - 1, Tsushimanaka, Okayama, 700 - 8530, Japan & fhyodo @ cc. okayama-u. ac. jp; https: // orcid. org / 0000 - 0001 - 8344 - 9353 fhyodo@cc.okayama-u.ac.jp Author Itioka, Takao 0000-0002-8295-5657 Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu, Kyoto 606 - 8501, Japan & ichioka. takao. 5 m @ kyoto-u. ac. jp; https: // orcid. org / 0000 - 0002 - 8295 - 5657 ichioka.takao.5m@kyoto-u.ac.jp Author Mohamed, Maryati Tun Hussein Onn Malaysia, Hab Pendidikan Tinggi Pagoh, KM 1, Jalan Panchor, 84600 Panchor, Johor, Malaysia & maryatihayati 52 @ gmail. com Author Meleng, Paulus 0000-0003-3777-0597 Research Development and Innovation Division, Forest Department Sarawak, Kuching, KM 10, Jalan Datuk Amar Stephen Kalong Ningkan, 93250 Kuching, Sarawak, Malaysia & paulusm @ sarawak. gov. my; https: // orcid. org / 0000 - 0003 - 3777 - 0597 paulusm@sarawak.gov.my text Zootaxa 2023 2023-09-06 5343 1 55 73 http://dx.doi.org/10.11646/zootaxa.5343.1.3 journal article 265957 10.11646/zootaxa.5343.1.3 2fdc0a71-7108-489f-a878-b23d3437bddf 1175-5326 8324250 20BF9AB4-F86D-42EA-AEAA-7C03EBA44EB6 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. 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. 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. 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. 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. 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. 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 .