Eutittha hainanensis, Li & Zhang, 2024

Li, Zhao-Yi & Zhang, Feng, 2024, A survey of cheiracanthiid spiders (Araneae: Cheiracanthiidae) from Hainan Island, China, Journal of Natural History 58 (1 - 4), pp. 167-188 : 184-186

Eutittha hainanensis sp. n.

( Figures 8 , 9 )

Type material

Holotype. ♀, CHINA, Hainan, Ledong County, Jianfengling Nature Reserve , 15 December 2003, Mingsheng Zhu leg.

Etymology

The species name is a toponym in apposition referring to the type locality.

Diagnosis

This species ( Figure 8b–c ) resembles E. submordax ( Zhang, Zhu and Hu, 1993) (Zhang et al. 1993, p. 106, fig. 2), E. brevicalcarata (L. Koch, 1873) ( Deeleman-Reinhold 2001, p. 231, fig. 285), E. mordax (L. Koch, 1866) ( Dondale 1966, p. 1178, fig. 6I; Hidaka 2022, p. 173, fig. 16) and E. stratiotica (L. Koch, 1873) (Forste 1979, p. 92, figs. 355–356) in having dumbbell-shaped spermathecae, but can be distinguished by the number of coils of copulatory ducts (2 spiral coils in E. hainanensis , vs 4 coils in E. brevicalcarata and E. submordax , 3 coils in E. mordax and E. stratiotica ).

Description

Female (holotype). ( Figure 8a ) Total length 7.61: carapace length 3.57, width 2.51; abdomen length 4.04, width 1.79. Carapace orange-yellow, with indistinct radial striaes. All eyes with black rings, AER and PER slightly recurved, PER slightly wider than AER in dorsal view. Eye sizes and interdistances: AME 0.18, ALE 0.15, PME 0.15, PLE 0.13; AME– AME 0.38, AME–ALE 0.18, PME–PME 0.30, PME–PLE 0.24; MOA 0.55 long, front width 0.71, back width 0.62. Chelicerae reddish brown, with 3 promarginal and 2 retromarginal teeth, with dense scopula in both margins. Sternum pale yellow. Labium and endites yellowish brown, anterior edge with clearly scopula. Legs pale yellow, without distinct markings. Leg measurements: I 21.14 (3.85, 1.15, 4.76, 7.30, 4.08), II 12.84 (3.51, 1.14, 3.61, 3.52, 1.06), III 11.11 (3.14, 0.94, 2.44, 3.55, 1.04), IV 14.80 (3.67, 1.14, 4.33, 4.03, 1.60). Abdomen longitudinal ovoid, dorsally with a pale yellow medial longitudinal band enclosed by 2 white wide bands, terminal part with a diamond-shaped yellow band.

Epigyne. ( Figure 8b–c ) Atrium ca. 1.3 times wider than long, atrial anterior margin archshaped and heavily sclerotised, posterior margin inconspicuous; 2 copulatory openings located at postero-lateral margins of atrium; part of dark copulatory duct and spermathecae visible through tegument of epigynal plate in ventral view; spermathecae constricted in the middle, dumbbell-shaped, connected with simple spiral-coiled copulatory duct (each ascending portion of copulatory duct coils forming 2 entwined loops and then descending into the spermatheca).

Male. Unknown.

Distribution

Presently known from the type locality only, Hainan, China .

Figures

Figure 8. Eutittha hainanensis sp. n., female holotype. (a) habitus, dorsal view; (b) epigyne, ventral view; (c) vulva, dorsal view.

Figure 9. Distribution records of six cheiracanthiid spiders from Hainan Island, China. (a–b) Cheiracanthium adjacensoides Song, Chen and Hou, 1990; (a, c–e) C. bawanglingense sp. n.; (a, c–g) C. exquestitum Zhang and Zhu, 1993; (a, d–f) C. insigne O. Pickard-Cambridge 1874; (e) C. taegense Paik, 1990 and Eutittha hainanensis sp. n.