Caridina laticarpalis, Cai & Ng, 2018

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), Zoological Studies 57 (27), pp. 1-33 : 22-26

publication ID	https://doi.org/ 10.6620/ZS.2018.57-27
DOI	https://doi.org/10.5281/zenodo.12826772
persistent identifier	https://treatment.plazi.org/id/03998788-FF89-0409-C9AF-FF163FD4FAC2
treatment provided by	Felipe
scientific name	Caridina laticarpalis
status	sp. nov.

Treatment

Caridina laticarpalis View in CoL sp. nov.

( Figs. 16-18 View Fig View Fig View Fig )

urn:lsid:zoobank.org:act:E0AA744D-ACC9-4929-A637-1D40D2056C25

Material examined: Holotype: male, cl 4.3 mm, IZCAS DE 5040 View Materials 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 View Fig , 18A, B View Fig ) 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 View Fig , 18E View Fig ) 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 View Fig , 18A, B View Fig ) well developed. Antennular peduncle about 0.6 times carapace length. Stylocerite reaching 0.8 basal segment antennular peduncle length. Scaphocerite ( Fig. 16B View Fig ) 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 View Fig ) with simple palp, lower lacinia broadly rounded, upper lacinia broadly elongated, inner edge straight. Maxilla ( Fig. 16D View Fig ) with slender palp, upper endite subdivided, scaphognathite tapering with numerous long setae posteriorly. Palp of first maxilliped ( Fig. 16E View Fig ) stout, terminating in triangular projection. Endopod of second maxilliped ( Fig. 16F View Fig ) with fused dactylus and propodal segments. Third maxilliped ( Fig. 16G View Fig ) 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 View Fig , 18C View Fig ) 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 View Fig , 18D View Fig ) 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 View Fig ) 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 View Fig ) 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.

Endopod of male first pleopod ( Fig. 17G, H View Fig ) 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 View Fig ) reaching 0.8 endopod length; shoter than appendix interna.

Uropodal diaeresis ( Fig. 17J View Fig View Fig View Fig View Fig View Fig View Fig View Fig ) 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 View Fig ) (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 View Fig ) (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 View Fig ) (vs. 66-69; cf. Liang and Zhou, 1993: fig. 2(7)); and the smaller number of ventral rostral teeth (14 or 15; Figs. 16A View Fig , 18A, B View Fig ) (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 View Fig ) (vs. at the end of endopod; Fig. 17F View Fig ), and by the larger number of ventral teeth on the rostrum (14 or 15, Figs. 16A View Fig , 18A, B View Fig ) (vs. 7-12, Figs. 14A View Fig , 15A View Fig ).