Utivarachna Kishida, 1940

Dhiya’Ulhaq, Naufal Urfi, Dupérré, Nadine, Buchori, Damayanti, Scheu, Stefan & Drescher, Jochen, 2024, Four new species of Utivarachna Kishida, 1940 (Araneae: Trachelidae) from Sumatra, Zootaxa 5418 (5), pp. 551-575 : 553

Utivarachna Kishida, 1940

Type species: Utivarachna fukasawana Kishida, 1940

Diagnosis. According to Deeleman-Reinhold (2001), the genus Utivarachna is closest to Trachelas L. Koch, 1872 but can be distinguished from it by the following characters: lateral invagination of carapace just behind the cephalic region ( Figs 1A , 3A ); pits in the margins of sternum ( Figs 1B , 3B ); triangular projection of the clypeus extending between the cheliceral bases; chitinous stripes between carapace and sternum ( Figs 1B , 3B ); lengthened leg I with multiple rows of ventral cuspules in males ( Figs 1C , 7C ) (versus not lengthened and with one row of cuspules or cuspules absent); embolus forming transverse apical coil ( Figs 2 , 4 ); epigynum with large posterior atrium ( Figs 6 , 9D–E ); copulatory openings located posteriorly (versus more anteriorly-located, Figs 6 9D–E ).

Composition. Utivarachna contains 31 species that are currently divided into four species groups. For their diagnosis, see Deeleman-Reinhold (2001) and Liu et al. (2020):

dusun -group: U. dusun Deeleman-Reinhold, 2001 ; U. itiokai Yamasaki, 2023 ; U. rubra Deeleman-Reinhold, 2001 and U. yumaoi Lin & Li, 2023 .

fukasawana -group: U. chamaeleon Deeleman-Reinhold, 2001 ; U. galyanae Dankittipakul, Tavano & Singtripop, 2011 ; U. fukasawana Kishida, 1940 and U. ichneumon Deeleman-Reinhold, 2001 .

kinabaluensis -group: U. accentuata ( Simon, 1896) ; U. angsoduo sp. nov.; U. arcuata Zhao & Peng, 2014 ; U. bucculenta Deeleman-Reinhold, 2001 ; U. convolutiva Dankittipakul, Tavano & Singtripop, 2011 ; U. fabaria Zhao & Peng, 2014 ; U. fanjing Li, Zhang & Yu, 2022 ; U. fronto ( Simon, 1906) ; U. gongshanensis Zhao & Peng, 2014 ; U. kinabaluensis Deeleman-Reinhold, 2001 ; U. lata Jin, Yin & Zhang, 2015 ; U. linyejiei Chu & Li, 2023 ; U. rama Chami-Kranon & Likhitrakarn, 2007 ; U. subfabaria Liu, Xu & Haddad, 2020 ; U. taiwanica ( Hayashi & Yoshida, 1993) ; U. tamdao Chu & Li, 2023 ; U. tangi Liu, Xu & Haddad, 2020 ; U. trisula sp. nov. and U. zhengguoi Chu & Li, 2023 .

phyllicola -group: U. balonku sp. nov.; U. gui (Zhu, Song & Kim, 1998); U. phyllicola Deeleman-Reinhold, 2001 and U. rimba sp. nov.

Distribution. Tropical Asia: India, Sri Lanka, China, Taiwan, Myanmar, Vietnam, Thailand, Peninsular Malaysia, Sumatra, and Borneo.

Figures

FIGURE 1. Utivarachna angsoduo sp. nov., male holotype. A, B Habitus, dorsal view (A), ventral view (B); C Right leg I, prolateral view. D Sternum, ventral view. Scale bars A, B = 1 mm; C, D = 0.5 mm.

FIGURE 2. Utivarachna angsoduo sp. nov., male holotype. A–E Left palp: A prolateral view; B, D ventral view; C, E retrolateral view. Scale bars = 0.2 mm. Abbreviations: dl, dorsal lobe of RTA; ds, dorsal spine of dorsal RTA lobe; e, embolus; rta, retrolateral tibial apophysis; st, subtegulum; vl, ventral lobe of RTA.

FIGURE 3. Utivarachna balonku sp. nov., male holotype. A, B Habitus, dorsal view (A), ventral view (B); C Left leg I, prolateral view. Scale bars A, B = 1 mm; C = 0.5 mm.

FIGURE 4. Utivarachna balonku sp. nov., male holotype. A–E Left palp: A prolateral view; B, D ventral view; C, E retrolateral view. Scale bars A–E = 0.2 mm. Abbreviations: ac, apical claw of RTA; e, embolus; rta, retrolateral tibial apophysis; st, subtegulum.

FIGURE 6. Utivarachna balonku sp. nov., female paratype. A Epigynum, ventral view; B, C Internal genitalia, cleared, dorsal view. Scale bars 0.2 mm.Abbreviations: at, atrium; b, bursa; cnd, connecting duct; co, copulatory opening; cod, copulatory duct; fd, fertilization duct; s, spermatheca.

FIGURE 7. Utivarachna phyllicola Deeleman-Reinhold, 2001, male. A, B Habitus, dorsal view (A), ventral view (B); C Left leg I, prolateral view. Scale bars A, B = 1 mm; C = 0.5 mm.

FIGURE 9. Utivarachna phyllicola Deeleman-Reinhold, 2001. A–C Male left palp: A prolateral view; B ventral view; C retrolateral view; D Epigynum, ventral view. E Female internal genitalia, cleared, dorsal view. Scale bars 0.2 mm.