Caridina laticarpalis 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 laticarpalis

description: Caridina laticarpalis sp. nov.   
(Figs. 16-18)  
urn:lsid:zoobank.org:act: E0AA744D-ACC9-4929-A637- 1D40D2056C25  
 Material examined: Holotype: male, cl 4.3 mm, IZCAS DE 5040 karst cave in Wuming County, Guangxi Province, southern China, coll. B. Sket, 22 Nov 1977. Paratypes: 2 females, cl 4.8-5.4 mm, ZRC 2018.0486, same data as holotype.   
 Description: Rostrum (Figs. 16A, 18A, B) straight, or slightly upturned at distal half, reaching beyond distal end of scaphocerite, as long as or slightly longer than carapace; rostral formula 6-8 + 16-21/14-15. Antennal spine fused with suborbital angle. Pterygostomian angle broadly rounded.   
Telson (Figs. 16H, 18E) with prominent posteromedian projection, posterior margin rounded, lateral pair of spines longer than intermediate pairs of composite setae, sub-lateral pairs shortest.  
Eyes (Figs. 16A, 18A, B) well developed. Antennular peduncle about 0.6 times carapace length. Stylocerite reaching 0.8 basal segment antennular peduncle length. Scaphocerite (Fig. 16B) 3.3 times as long as wide, outer margin straight.  
Mouthparts as figured. Mandible with blunt teeth at extremity of incisor process. Maxillula (Fig. 16C) with simple palp, lower lacinia broadly rounded, upper lacinia broadly elongated, inner edge straight. Maxilla (Fig. 16D) with slender palp, upper endite subdivided, scaphognathite tapering with numerous long setae posteriorly. Palp of first maxilliped (Fig. 16E) stout, terminating in triangular projection. Endopod of second maxilliped (Fig. 16F) with fused dactylus and propodal segments. Third maxilliped (Fig. 16G) reaching to distal end of antennular peduncle, ending in single terminal claw; exopod reaching posterior quarter of penultimate segment, ultimate segment slightly shorter than pentultimate segment. Epipods on first 4 pereiopods.  
First pereiopod (Figs. 17A, 18C) short, stout, reaching distal end of eyes, merus 1.4-1.9 times as long as broad; carpus strongly concave anteriorly, 1.0-1.2 times as long as high, chela 1.9-2.2 times as long as broad, fingers 0.8 times as long as palm. Second pereiopod (Fig. 17B, 18D) reaching beyond end of basal segment of antennular peduncle, carpus 2.6-3.0 times as long as high, chela longer than carpus, 2.4 times as long as broad, fingers slightly shorter or as long as palm. Third pereiopod (Fig. 17C, D) reaching beyond distal end of antennular peduncle, propodus 10 times as long as broad, 4.6 times as long as dactylus (claw included); dactylus ending in 2 claws, with 4 spines. Fifth pereiopod (Fig. 17E, F) reaching to end of antennular peduncle, propodus 13 times as long as wide, 4.3 times as long as dactylus; dactylus with 42-45 spinules on flexor margin.  
© 2018 Academia Sinica, Taiwan  
© 2018 Academia Sinica, Taiwan  
© 2018 Academia Sinica, Taiwan  
Endopod of male first pleopod (Fig. 17G, H) short, reaching to quarter endopod length, sub-triangular, 1.7 times as long as wide, appendix interna near distal end of endopod, reaching well beyond distal end of endopod. Appendix masculina of male second pleopod (Fig. 17I) reaching 0.8 endopod length; shoter than appendix interna.  
© 2018 Academia Sinica, Taiwan  
Uropodal diaeresis (Fig. 17J) with 12 spinules.  
 Habitat: Stream in a karst cave.   
 Etymology: The new species is named for its distinctive broad carpus of first pereiopod, from the Latin for broad (latus) and carpus.   
 Remarks: Taking the form of rostrum and the relatively shorter fingers of the first pereiopod into account, C. laticarpalis sp. nov. is most similar to C. cavernicola Liang and Zhou, 1993 and C. guilin sp. nov. It can be separated from the latter two species by the rounded distal margin of the female telson (Fig. 16H) (vs. strongly acutely triangular in C. cavernicola, cf. Liang and Zhou, 1993 figs. 2(2); and C. guilin, fig. 14B). It also differs from C. cavernicola by the shorter carpus of the first pereiopod (ratio 1.0-1.2, Fig. 17A) (vs. 1.4-1.7; cf. Liang and Zhou, 1993: fig. 2(4)); possessing fewer spinules on the dactylus of the fifth pereiopod (42- 45, Fig. 17F) (vs. 66-69; cf. Liang and Zhou, 1993: fig. 2(7)); and the smaller number of ventral rostral teeth (14 or 15; Figs. 16A, 18A, B) (vs. 20-24; cf. cf. Liang and Zhou, 1993: fig. 2(1)). Caridina laticarpalis can be further differentiated from C. guilin by the form of the appendix interna of the endopod of the male first pleopod. which is located near the end of the endopod (Fig. 19G, H) (vs. at the end of endopod; Fig. 17F), and by the larger number of ventral teeth on the rostrum (14 or 15, Figs. 16A, 18A, B) (vs. 7-12, Figs. 14A, 15A).   
 Distribution: Guangxi Province (Wuming), 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 22-26, DOI: 10.6620/ZS.2018.57-27, http://zenodo.org/record/13314991