Euochin extraculum, Wang & Zhang, 2023
publication ID |
https://doi.org/ 10.11646/zootaxa.5297.3.2 |
publication LSID |
lsid:zoobank.org:pub:A5E47BD6-8995-40CC-9C0F-CA7462A62DF2 |
DOI |
https://doi.org/10.5281/zenodo.8005040 |
persistent identifier |
https://treatment.plazi.org/id/F70C8787-FF84-E076-FF5C-FA77FD90FDA7 |
treatment provided by |
Plazi |
scientific name |
Euochin extraculum |
status |
sp. nov. |
Euochin extraculum View in CoL sp. nov. (Mƙẅss)
Figs 51–70 View FIGURES 51–54 View FIGURES 55–59 View FIGURES 60–66 View FIGURES 67–70
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. GoogleMaps Paratypes: 3♁ 1♀ (MHBU-ARA-00025228), same data as holotype GoogleMaps .
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 View FIGURES 60–66 , 68 View FIGURES 67–70 ; 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 View FIGURES 51–54 , 55, 57 View FIGURES 55–59 . 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 View FIGURES 55–59 ) with two promarginal and one retromarginal teeth. Palp ( Figs 60–64 View FIGURES 60–66 , 67–68 View FIGURES 67–70 ): 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 View FIGURES 51–54 , 56, 58 View FIGURES 55–59 . 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).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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