Bathya brevicarpus Wang & Zhu & Sha & Ren 2020, gen. et sp. nov.
Creators: name: Wang, Yan-Rong
name: Zhu, Chao-Dong
name: Sha, Zhong-Li
name: Ren, Xian-Qiu
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Calliopiidae
Bathya
Bathya brevicarpus

description: Bathya brevicarpus gen. et sp. nov.
urn:lsid:zoobank.org:act: 2A8520B1-C0C6-4BAB-9C8D-A7DFB57B111D
Figs 1–2
Diagnosis
As for the genus.
Etymology
The new species name contains the Latin ‘ brev ’ (= short), referring to the carpus of the gnathopods 1 and 2 being shorter than the propodus.
Material examined
Holotype
NORTH-WEST PACIFIC • ♂, 5.6 mm, dissected; Okinawa Trough; depth 996.9 m; 17 Apr. 2014; RY0108, ROV-4; MBM 286556.
Description
BODY. Dorsally smooth.
HEAD. Nearly subequal in length to pereonites 1 and 2 combined, rostrum small, anterior lobe rounded, lower margin with large and acute projecting tooth anterodistally; eyes present, but not pigmented, hardly visible in ethanol material.
ANTENNA. Antenna 1 longer than antenna 2; peduncular article 1 wider and longer than article 2; article 2 less than twice longer than article 3; article 3 not produced apicoventrally; primary flagellum 23-articulate, few very thin and short setae scattered along flagellum; accessory flagellum absent. Antenna 2 slender than antenna 1, peduncular article 5 distinctly longer than article 4; flagellum longer than peduncle, 28-articulate.
MOUTH PARTS. Upper lip and lower lip broken. Mandible symmetrical, with incisor dentate, bearing 7 teeth; lacinia mobilis dentate, with 8 teeth; with 12 accessory spines; molar well developed, columnar, triturative; palp elongate, slender, 3-articulate, article 3 longer than article 2, ventral face bearing short stout setae. Maxilla 1 with inner plate bearing one apical stout seta; palp 2-articulate, article 2 longer than article 1, bearing 6 small robust and three long simple setae. Maxilla 2 inner plate slightly narrower than outer, only bearing sparse slender subapical marginal setae, without oblique row of slender setae.
GNATHOPODS. Coxae 1–4 longer than broad, coxa 4 broader than coxae 1–3. Gnathopod 1 subchelate, slightly smaller than gnathopod 2; coxa weakly produced anteroventrally; merus subrectangular, bearing row of slender setae along distal margin; carpus shorter than propodus, cup-shaped, with dense long slender setae on posterior margin; propodus suboval, palm acute, posterior margin with robust and short simple setae; dactylus evenly tapering, with acute tip. Gnathopod 2 similar in shape to ganthopod 1; coxa subrectangular, subequal in length to coxa 1, anterior margin slightly convex; carpus distinctly shorter than propodus, weakly lobed; propodus with tooth-like protruded sub-distally, bearing short simple and robust setae along posterior margin; dactylus with acute tip, evenly tapering.
PEREOPODS. Pereopod 3 (distal three articles broken in holotype) slender, merus bearing large produced lobe anterodistally. Pereopod 4 similar to pereopod 3, but coxa much broader. Pereopod 5 slightly longer than pereopod 7, coxa bilobate, anterior lobe smaller than posterior lobe; merus broader than distal three articles, with posterodistal strongly produced as lobe, anterior margin with 4+ groups of 2–3 robust setae; propodus 1.4 times longer than carpus, anterior margin bearing 8 groups of 2–3 bifid robust setae; dactylus slender, with acute tip, evenly tapering, 0.7 length of propodus, with small nail. Pereopod 6 (distal three articles broken in holotype) gill smaller than that of pereopod 5; coxa bilobate, anterior lobe much smaller than posterior lobe; basis slight longer than that of pereopod 5. Pereopod 7 coxa unilobate, rounded; basis broader than that of pereopods 5 and 6, anterior margin bearing robust setae; propodus subequal in length to carpus; dactylus half-length of propodus, with small acute nail.
GILLS. Present on coxae 2–6, small, not pleated.
EPIMERAL PLATES 1 AND 3. Without tooth on posterior margin, postero-corner of epimeral 2 being subacute.
UROPODS. Uropod 1 overreaching distal end of uropod 2, without interramal spur; peduncle shorter than rami, with 19 marginal and one large distal robust setae; outer ramus shorter than inner ramus, but subequal in broad to inner, with 9 marginal and three distal robust setae; inner ramus with 14 marginal and 3 distal robust setae. Uropod 2 peduncle distinctly shorter than rami, with 5 marginal and two distal robust setae; outer ramus 0.6 times shorter than inner ramus, with 10 marginal and three distal robust setae; inner ramus with 15 marginal and three distal robust setae. Uropod 3 shorter than uropod 2, peduncle shorter than rami, with one robust seta distally; outer ramus 0.55 times shorter than inner ramus, with 7 marginal robust setae; inner ramus with 15 marginal robust setae.
TELSON. Entire, longer than broad (length 1.7 times as long as width at base), distal margin convex.
description: Published as part of Wang, Yan-Rong, Zhu, Chao-Dong, Sha, Zhong-Li & Ren, Xian-Qiu, 2020, Bathya brevicarpus gen. et sp. nov. (Amphipoda: Senticaudata: Calliopiidae), from hydrothermal vents, Okinawa Trough, North-west Pacific, pp. 1-12 in European Journal of Taxonomy 693 on pages 4-7, DOI: 10.5852/ejt.2020.693, http://zenodo.org/record/3973339