Manuscaris, Komai & Tsuchida, 2015

Komai, Tomoyuki & Tsuchida, Shinji, 2015, New records of Alvinocarididae (Crustacea: Decapoda: Caridea) from the southwestern Pacific hydrothermal vents, with descriptions of one new genus and three new species, Journal of Natural History 49 (29), pp. 1789-1824 : 1810-1811

publication ID

https://doi.org/ 10.1080/00222933.2015.1006702

publication LSID

lsid:zoobank.org:pub:4BFC8C31-C006-4738-BED7-B13D3296A7CA

DOI

https://doi.org/10.5281/zenodo.4329040

persistent identifier

https://treatment.plazi.org/id/DB44B494-FD27-425B-B170-D24DA402C1ED

taxon LSID

lsid:zoobank.org:act:DB44B494-FD27-425B-B170-D24DA402C1ED

treatment provided by

Carolina

scientific name

Manuscaris
status

gen. nov.

Manuscaris View in CoL gen. nov.

Type species

Manuscaris acuminatus View in CoL sp. nov.

Composition

Monotypic

Diagnosis

Rostrum narrowly triangular in dorsal view, slightly overreaching distal margin of first segment of antennular peduncle; dorsal margin sharply carinate, armed with row of conspicuous teeth, posteriormost tooth located just posterior to rostral base; ventral margin nearly flat, with minute denticle subterminally. Carapace with low, blunt postrostral carina not extending to midlength; antennal tooth acuminate, with small lobe ventromesial to its base; pterygostomial tooth strong, acuminate; anterior part of branchial region not inflated. Third to fifth pleonal pleura at least with posteroventral tooth. Telson with dorsolateral spines in linear row; posterior margin convex, with row of plumose setae flanked by two pairs of lateral spines. Eyes fused, though shallow median notch evident; anterior surface of each eye flat, unarmed. Antennular stylocerite well separated from first peduncular segment. Antenna not forming operculate structure (see Martin and Hessler 1990); antennal scale with sharp distolateral tooth clearly separated from lamella; no transverse suture extending mesially from base of distolateral tooth. First maxilliped with rudimentary bud of exopodal flagellum. First pereopod with well-developed grooming apparatus on carpus consisting of patch of setae and one small spine. Second pereopod with spine on ischium. Third pereopod shorter than fifth pereopod; dactyli with accessory spinules on flexor margins arranged in two rows; meri of third and fifth pereopods unarmed; ischia of third pereopods with two spines. No strap-like epipods on third maxilliped to fourth pereopods. Appendix interna of fourth pleopod without terminal cluster of coupling hooks. Uropodal exopod with one spine just mesial to sharp posterolateral tooth; protopod terminating posterolaterally in sharp tooth.

Remarks

Manuscaris gen. nov. appears to be close to a group of genera that includes Alvinocaridinides , Shinkaicaris , Opaepele , Chorocaris and Rimicaris based on sharing the following apparently apomorphic characters: rostrum more or less reduced in length with reduced ventral limb; eyes broadly fused with shallow median notch, each anterior surface rather flat and unarmed; dactyli of third to fifth pereopods each with accessory spinules arranged in two or more rows; and meri of third to fifth pereopods devoid of spines. Nevertheless, the new genus is excluded from this group by the dorsolateral spines on the telson arranged in a linear row and the presence of spines on the ischia on the third and fourth pereopods, which are presumably plesiomorphic characters (cf. Komai and Segonzac, 2005).

Etymology

A combination of the name of the type locality (Manus Basin) and the Greek caris (= shrimp). Gender : masculine .

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