Pseudomma nanum ( Holt & Tattersall, 1906 )

Wittmann, Karl J., 2020, Lophogastrida and Mysida (Crustacea) of the “ DIVA- 1 ” deep-sea expedition to the Angola Basin (SE-Atlantic), European Journal of Taxonomy 628, pp. 1-43 : 18

Pseudomma nanum ( Holt & Tattersall, 1906)

Material examined (non-types only) ANGOLA BASIN • 1 imm. (BL = 7.2 mm); 17°4.935′ S, 4°40.805′ E to 17°07.454′ S, 4°42.276′ E; bottom

depth 5460– 5460 m; 25 Jul. 2000; DIVA-1 exped., #344; epinet of epibenthic sledge; ZMH 58262 • 1 imm. (BL = 6.8 mm); 16°13.329′ S, 5°26.837′ E to 16°14.820′ S, 5°26.702′ E; bottom depth 5433– 5434 m; 29 Jul. 2000; DIVA-1 exped., #350; epinet of epibenthic sledge; SMF 55192 .

Type locality

Not explicitly stated by Holt & Tattersall (1906). On page 36 they indicated “length of the type female 8 mm, of the type male (adult) 6.5 mm ”. Such body sizes fit only with the material listed by them on pages 37–38 as having been caught off Ireland, 48̄50 nautical miles (89̄93 km) WNW of Tearaght, depth 360– 387 fathoms (658̄ 708 m). Coordinates roughly estimated by the present author as 52°24′ N, 11°54′ W.

Distribution

Previously reported from the NE-Atlantic and Mediterranean, 38̄62° N, 12° W ̄ 21° E,depth 360̄2200 m (W.M. Tattersall 1911; Nouvel & Lagardère 1976; Mauchline 1986; Gordon & Duncan 1987; Meland & Brattegard 1995; Madurell & Cartes 2003; Sorbe & Elizalde 2013; Petryashov 2014; San Vicente 2017). Madurell & Cartes (2003) considered this species as suprabenthic. The here documented records in the SE-Atlantic at 16̄17° S, 5° E, depth 5433̄5460 m, represent strong extensions of the known geographical as well as bathymetrical ranges (see also Discussion).