Rhyscotus subrisus Li & Jiang, 2024
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publication ID |
https://doi.org/ 10.11865/zs.2024206 |
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publication LSID |
lsid:zoobank.org:pub:5FB03411-A88D-4DFD-9253-41B59CD2D1E1 |
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persistent identifier |
https://treatment.plazi.org/id/765D6E15-FFAE-B569-FF7A-FAACD7A8FBE7 |
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treatment provided by |
Felipe |
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scientific name |
Rhyscotus subrisus Li & Jiang |
| status |
sp. nov. |
Rhyscotus subrisus Li & Jiang , sp. nov. ( Figs 1–2 View Figure 1 View Figure 2 )
Type material. Holotype ♂, China: Hainan, Sanya, Jiyang (109°34′E, 18°17′N), elev. 10 m, 9.II.2023, leg. Haocong Yang ( JXAUM) GoogleMaps . Paratypes. 1♀, same data as the holotype GoogleMaps ; 2♂ 2♀, same data as the holotype except for collected date 9. VI. 2023, leg. Chao Jiang ( CMMI) GoogleMaps .
Etymology. The specific name is derived from the Latin subrisus = smile, in reference to the dorsal surface of the species with a pattern like a smiling face on the first and second pleonites.
Diagnosis. Pleopod 1 endopodite almost three times as long as the longest part of exopodite, and male pleopod 2 exopodite with a finger-shaped apical tip.
Description. Body length 5.0–7.0 mm. Colour of dorsal surface white with brown blotches. Each pereonite with two triangular blotches and two incurved stipes near lateral side ( Figs 1A–B View Figure 1 ). Pleon narrower than pereon, epimera short; pleonites 1 and 2 with smiling face pattern near middle ( Fig. 1D View Figure 1 ). Telson nearly triangular, distinctively concave on lateral margin, distal apex pointed ( Fig. 1D View Figure 1 ).
Head white with irregular brown patterns; frons brown, bearing fourteen white stripes and three white dots ( Figs 1A− C View Figure 1 ). Antenna with second flagellar article almost three times as long as first one, apical organ thin and short ( Fig. 2A View Figure 2 ). Pereopods without apparent sexual specializations, pereopod 1 without particular modifications, ischium of pereopod 7 deeply concave on ventral margin ( Figs 2B–C View Figure 2 ).
Pleopods, sexual differentiation. Male pleopod 1 exopodite small and elliptic; endopodite approximate three times as long as longest part of exopodite, basal part broad, narrowed towards apical tip ( Fig. 2D View Figure 2 ). Male pleopod 2 exopodite convex on outer margin, apical tip finger-shaped; endopodite thin and long, distinctly longer than exopodite ( Fig. 2E View Figure 2 ). Pleopods 3 and 4 exopodites convex on outer margin, ending with triangular apical tip ( Figs 2F–G View Figure 2 ). Pleopod 5 nearly straight on outer margin, concave at distal one-fifth area ( Fig. 2H View Figure 2 ).
Distribution. China (Hainan).
Remarks. The new species is similar to R. rotundatus Schmalfuss & Ferrara, 1978 by pointed apex of telson and small and elliptic pleopod 1 exopodite ( Figs 1D View Figure 1 , 2D View Figure 2 vs. Schmalfuss & Ferrara, 1978: figs 22, 26). But it can be distinguished from the latter species by the features of pleopods 1 and 2: pleopod 1 endopodite of the new species almost three times as long as the longest part of exopodite, and male pleopod 2 exopodite with a finger-shaped apical tip ( Figs 2D, E View Figure 2 ); in R. rotundatus , the pleopod 1 endopodite about twice as long as the longest part of exopodite, and the male pleopod 2 exopodite with a round apical tip (Schmalfuss & Ferrara, 1978: figs 26−28).
Funding This study was supported by the National Natural Science Foundation of China (31960100, 82073972).
Acknowledgements We are grateful to Mr. Haocong Yang for providing the specimens. Special thanks are given to Dr. Ghasem M. Kashani (University of Zanjan, Iran) and an anonymous reviewer for their insightful suggestions.
Chonghui Yao1, Chao Jiang2 *, Weichun Li1 * 1College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China
2 State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
* Corresponding authors, E-mails: jiangchao0411@126.com, weichunlee@126.com
| CMMI |
Chinese Academy of Traditional Medicine |
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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