Caridina beiliu Cai & Ng, 2018, sp. nov.
Creators: name: Cai, Yixiong
name: Ng, Peter Kee Lin
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Atyidae
Caridina
Caridina beiliu

description: Caridina beiliu sp. nov.   
(Figs. 10-12)  
urn:lsid:zoobank.org:act: 3CCBD229-9AEF-4016-A652- F932F38FD51B  
 Material examined: Holotype: male, cl 5.8 mm, IZCAS DE 5032, Goulou Cave in Beiliu County, Guangxi Province, southern China, coll. Y. Cai et al., 30 Oct 1993. Paratypes: 1 male, cl 5.7 mm, IZCAS DE 5033, 1 female, cl 5.0 mm, IZCAS DE 5034, 1 female, cl 5.1 mm, IZCAS DE 5035, data same as holotype; 3 males, cl 5.7-6.7 mm, 5 females, cl 5.5-6.8 mm, ZRC 2018.0483, same data as holotype; 3 males, cl 4.2-5.5 mm, 1 female, cl 5.8 mm, RMNH.CRUS. D.57291, data same as holotype.   
 Comparative material examined: Caridina cornuta Liang and Yan, 1986 - Holotype: 1 male, cl 4.2 mm, SFU 84-53 - 1, 2 females, cl 3.8-6.6 mm, SFU 84-53 - 2, Zhijing County, Guizhou Province, China, 29 May 1984.   
 Description: Rostrum (Fig. 10A) straight, slightly downwards, reaching near distal end of antennular peduncle, armed dorsally with 16 teeth, of which 4 are on carapace behind posterior margin of orbital margin, armed ventrally with 1 tooth. Antennal spine fused with suborbital angle. Pterygostomian angle broadly rounded.   
Sixth abdominal somite twice as long as fifth abdominal somite, slightly more than half of carapace length. Telson (Fig. 12A, B) slightly longer than sixth abdominal somite, with prominent posteromedian projection, posterior margin rounded, with lateral pair of spines longer than intermediate pairs, sub-lateral pairs being shortest.  
Eyes (Fig. 10A) well developed. Antennular peduncle about half of carapace length. Stylocerite reaching to 0.8 basal segment length of antennular peduncle. Scaphocerite (Fig. 12C) 3.0 times as long as wide, outer margin straight.  
Mouthparts as figured. Mandible (Fig. 10B) with blunt teeth at extremity of incisor process. Maxillula (Fig. 10C) with simple palp, lower lacinia broadly rounded, upper lacinia broadly elongated, inner edge straight, with dense setae and teeth. Maxilla (Fig. 10D) with slender palp, upper endite subdivided, scaphognathite tapering with numerous long hooked setae posteriorly. Palp of first maxilliped (Fig. 10E) stout, terminating in triangular. Endopod of second maxilliped (Fig. 10F) with fused dactylus and propodal segments. Third maxilliped (Fig. 10G) reaching to distal end of antennular peduncle, ending in single terminal claw; exopod reaching posterior third of penultimate segment, ultimate segment shorter than pentultimate segment. Epipods on first 4 pereiopods.  
© 2018 Academia Sinica, Taiwan  
© 2018 Academia Sinica, Taiwan  
© 2018 Academia Sinica, Taiwan  
First pereiopod (Fig. 11A) short, stout, reaching distal end of eyes, merus 2.2 times as long as broad; carpus concave anteriorly, 1.5 times as long as high, chela 1.9 times as long as broad, fingers 0.7 times as long as palm. Second pereiopod (Fig. 11B) reaching slightly beyond end of basal segment of antennular peduncle, carpus 4.0 times as long as high, chela shorter than carpus, 2.1 times as long as broad, fingers 1.5 times as long as palm. Third pereiopod (Fig. 11C, D) reaching beyond distal end of scaphocerite, propodus 10 times as long as broad, 4.7 times as long as dactylus (claw included); dactylus terminating as a claw, with 4 accessory spines increasing in length and size distally on flexor margin. Fifth pereiopod (Fig. 11E, F) reaching beyond end of second segment of antennular peduncle, propodus 15 times as long as wide, 3.0 times as long as dactylus; dactylus with 46 spinules on flexor margin.  
Endopod of male first pleopod (Fig. 12D, E, F) short, sub-elliptical, 3.0 times as long as wide, inner margin straight, outer margin rounded, appendix interna at distal part of endopod, reaching beyond distal end of endopod. Appendix interna of male second pleopod (Fig. 12G) small, slender.  
Uropodal diaeresis (Fig. 10 H) with 13 spinules.  
 Habitat: Subterrenean water in karst cave.   
 Etymology: The species is named after the type locality, Beiliu County. The name is used as a noun in apposition.   
 Remarks: Caridina beiliu sp. nov. resembles C. cornuta Liang and Yan, 1986, from Guizhou Province, in the form of the rostrum. However, it can be distinguished from C. cornuta by the telson possessing a posteromedian projection (Fig. 12B) (vs. with no projection in C. cornuta; cf. Liang and Yan, 1986: fig. 3(2)); and the sub-elliptical endopod of the male pleopod does not have a projection at the base (Fig. 12F) (vs. subrectangular with a basal projection in C. cornuta; cf. Liang and Yan, 1986: fig. 3(7)).   
 Distribution: Guangxi Province (Goulou Cave), China.
description: Published as part of Cai, Yixiong & Ng, Peter Kee Lin, 2018, Freshwater Shrimps from Karst Caves of Southern China, with Descriptions of Seven New Species and the Identity of Typhlocaridina linyunensis Li and Luo, 2001 (Crustacea: Decapoda: Caridea), pp. 1-33 in Zoological Studies 57 (27) on pages 13-17, DOI: 10.6620/ZS.2018.57-27, http://zenodo.org/record/13314991