Euochin extraculum, Wang & Zhang, 2023

Wang, Weihang & Zhang, Junxia, 2023, On fourteen species of Euochin Prószyński, 2018 from China (Araneae: Salticidae: Euophryini), Zootaxa 5297 (3), pp. 337-379 : 348-349

Euochin extraculum sp. nov. (Mƙẅss)

Figs 51–70

Type material. Holotype: ♁ (MHBU-ARA-00025227), CHINA: Hainan Province, Changjiang County, Qicha Town, hill behind the Mumian Scenic Spot (ϮĠAELJ), 19.078807°N, 109.084472°E, 269 m a.s.l., 16 July 2022, leg. L. Zhang, W. Wang, M. Xu & Z. Yang. Paratypes: 3♁ 1♀ (MHBU-ARA-00025228), same data as holotype .

Etymology. The specific epithet derives from the Latin extraculum (meaning corkscrew), referring to the shape of the embolus of the male palp. Noun in apposition.

Diagnosis. The males are similar to Euochin bamianshanensis comb. nov. in the corkscrew-like embolus, but can be easily distinguished by the hook-like RTA in retrolateral view of the male palp ( Figs 62 , 68 ; vs. straight RTA in retrolateral view of E. bamianshanensis comb. nov., see Liu et al. 2020: fig. 1D). For females, the large copulatory opening and the heavily sclerotized copulatory duct are unique among the known congeners.

Description. Male. Habitus see Figs 51–52 , 55, 57 . Carapace length 1.508; abdomen length 1.128. Eye measurements: AME 0.293, ALE 0.236, PME 0.071, PLE 0.188. Leg measurements: I 2.544 (0.805, 0.379, 0.646, 0.374, 0.340), II 2.071 (0.731, 0.277, 0.470, 0.323, 0.270), III 2.590 (0.934, 0.361, 0.485, 0.450, 0.360), IV 2.538 (0.807, 0.282, 0.516, 0.569, 0.364); leg formula: 1432. Color in ethanol: carapace dark, with yellowish-white setae forming stripes laterally. Abdomen yellowish-brown, with light bands and patches. Chelicera ( Fig. 59 ) with two promarginal and one retromarginal teeth. Palp ( Figs 60–64 , 67–68 ): patella, tibia and proximal part of dorsal cymbium covered with dense yellowish-white setae; embolus corkscrew-like, with straight sperm duct inside; cymbial flange highly reduced; RTA short, hook-like in retrolateral view.

Female. Habitus see Figs 53–54 , 56, 58 . Carapace length 1.653; abdomen length 1.500. Eye measurements: AME 0.380, ALE 0.242, PME 0.085, PLE 0.208. Leg measurements: I 2.586 (0.844, 0.410, 0.642, 0.344, 0.346), II 2.106 (0.714, 0.283, 0.525, 0.291, 0.293), III 2.716 (0.986, 0.416, 0.437, 0.513, 0.364, IV 2.910 (0.917, 0.325, 0.608, 0.650, 0.410); leg formula: 4312. Color in ethanol: similar to that of male, but with fewer light-colored setae around carapace margins. Chelicera as in male. Epigyne (65–66, 69–70): epigynal window located anteriorly, wider than long, without median septum, posterior margin relatively remote from spermatheca and genital furrow; copulatory opening exceptionally large; copulatory duct heavily sclerotized and compact; spermatheca globular, entirely beneath posterior rim of epigynal window in ventral view.

Distribution. China (Hainan).

Figures

FIGURES 51–54. Living spiders of Euochin extraculum sp. nov.. 51–52. Holotype male; 53–54. Paratype female.

FIGURES 55–59. Euochin extraculum sp. nov., holotype male (55, 57, 59) and paratype female (56, 58). 55–56. Habitus, in dorsal view; 57–58. Carapace, in frontal view; 59. Left male chelicera.

FIGURES 60–66. Genitalia of Euochin extraculum sp. nov.. 60–62. Left male palp of holotype, in prolateral (60), ventral (61) and retrolateral (62) view; 63. Inflated bulb; 64. Detail of embolus (© Kun Yu); 65–66. Epigyne, in ventral (65) and dorsal (66) view.

FIGURES 67–70. Genitalia of Euochin extraculum sp. nov.. 67. Left male palp of holotype, in ventral view; 68. RTA, in retrolateral view; 69–70. Epigyne of paratype, in ventral (69) and dorsal (70) view.