Bathyporeia Lindström, 1855

D'Acoz, Cedric D'Udekem, 2011, Validation of the family Bathyporeiidae (Crustacea, Amphipoda), Zootaxa 2791, pp. 54-62 : 60-61

Bathyporeia Lindström, 1855

( Figs 1 – 4 )

Bathyporeia Lindström, 1855: 37 – 59. — d'Udekem d'Acoz, 2007: 64 (ubi syn.)

Antenna 2: article 5 of peduncle distinctly shorter article 4; flagellum with posterior setae not more developed than anterior setae; flagellum increasing in size at maturity in males of most species. Mandible: incisor process with 2 or 3 erect spines; lacinia mobilis blade-shaped and elongate; palp with article 3 with D3-setae in mature males only, with F3-setae (isolated or forming groups); with article 2 slender (rarely slightly broadened), without B2-setae. Maxilla 1: article 2 of palp with scattered setae and without row of spines. Maxilliped: article 2 of palp with strong posterodistal lobe; article 3 of palp elongate and curved. Coxa 1 anteriorly directed, with anterior border strongly concave. Gnathopod 1 subchelate, reduced in size. Gnathopod 2 highly tranformed, neither chelate nor subchelate, with dactylus vestigial, with propodus elongate with very long setae on posterior border. Pereiopod 5 with dactylus vestigial. Pereiopod 7 with basis posteriorly not broadly rounded and distally not produced; ischium pentagona l. Urosomite 1 with two dorsal bumps; posterior bump with pair of anteriorly directed setae, with or without posteriorly directed spines. Uropod 3 with inner ramus very short and broadly elliptic, less than 0.2 times as long as outer ramus; outer ramus with variable number of groups of spines on lateral border; article 2 with or without setae on lateral border. Telson with only one group of lateral spines or setae (except for rare teratological specimens, which have two groups).

Type species. Bathyporeia pilosa Lindström, 1855 . See Lindström (1855: 59, pl. 2 fig. 1–11).

Composition. B. borgi d'Udekem d'Acoz & Vader, 2005 ; B. chevreuxi d'Udekem d'Acoz & Vader, 2005 ; B. cunctator d'Udekem d'Acoz & Vader, 2005 ; B. elegans Watkin, 1938 ; B. elkaimi d'Udekem d'Acoz & Menioui, 2004 ; B. griffithsi d'Udekem d'Acoz & Vader, 2005 ; B. gladiura d'Udekem d'Acoz & Vader, 2005 ; B. guilliamsoniana (Spence Bate, 1857) ; B. gracilis G. O. Sars, 1891 ; B. ledoyeri d'Udekem d'Acoz & Menioui, 2004 ; B. lindstromi Stebbing, 1906 ; B. microceras d'Udekem d'Acoz & Menioui, 2004 ; B. nana Toulmond, 1966 ; B. parkeri Bousfield, 1973 ; B. pelagica Spence Bate, 1857 ; B. phaiophthalma Bellan-Santini, 1973 ; B. pilosa Lindström, 1855 ; B. quoddyensis Shoemaker, 1949 ; B. sarsi Watkin, 1938 ; B. tenuipes Meinert, 1877 ; B. watkini d'Udekem d'Acoz, Echchaoui & Menioui, 2006 .

Distribution and biology. Eastern Atlantic (from Northern Norway to South Africa), Mediterranean and Black Sea, Northwestern Atlantic; sandy bottoms; intertidal to 106 m. An enigmatic record of Bathyporeia sp. from the equatorial Eastern Pacific ( Aerts et al. 2004) needs confirmation.

Figures

FIGURE 1. Bathyporeia elegans Watkin, 1938, adult female, 4 mm, with full ovaries, Norway, Tromsø area, Kvaløya, Sandvika, 62 ° 36 ' 51 " N 018 ° 05 ' 27 " E, 0.5 m depth at low tide, fine sand, July 2004 (specimen not preserved).

FIGURE 2. Bathyporeia spp. A, C, E, B. pilosa Lindström, 1855, adult female, 4 mm Northwestern Europe; B, D, F, B. guilliamsoniana (Bate, 1857), The Netherlands, adult male, 6 mm (specimens not preserved). A, B, habitus; C, D, anterior part of body; E, F, posterior part of body.

FIGURE 3. Bathyporeia spp. A, B. pilosa Lindström, 1855, adult female, 4 mm Northwestern Europe; B – G, B. guilliamsoniana (Bate, 1857), The Netherlands, B, D, E, adult male, 6 mm C, F, G, H, adult female, 6 mm (specimens not preserved). A, peduncle of A 1; B, calceolus; C, mandibular palp (female); D, mandibular palp (adult male); E, D 3 - setae of article 3 of mandibular palp (adult male); F, Mxp; G, posterofacial spine of inner plate of Mxp; H, tip of posterofacial spine of inner plate of Mxp (note the distal row of denticles).

FIGURE 4. Bathyporeia spp. D, B. pilosa Lindström, 1855, adult female, 4 mm Northwestern Europe; A – C, E – I, B. guilliamsoniana (Bate, 1857), The Netherlands: A – C, F – I, adult male; 6 mm, E, adult female, 6 mm (specimens not preserved). A, propodus of Gn 2; B, tip of propodus of Gn 2 and vestigial dactylus; C, tip of carpus, propodus and dactylus of left P 3 (note the enlarged distal carpal spine); D, right P 5; E, distal half of merus, carpus and propodus of left P 5; F, tip of propodus and vestigial dactylus of P 5; G, left P 6; H, left P 7; I, coxa, basis, ischium and proximal part of merus of left P 7.