Scolamblyops Murano, 1974

Wittmann, Karl J., 2024, The Mysidae (Crustacea, Mysida) of the ANDEEP I-III expeditions to the Antarctic deep sea with the description of twelve new species, establishment of four new genera and with world-wide keys to the species of Erythropinae and Mysidellinae, European Journal of Taxonomy 940, pp. 1-180 : 86-87

Genus Scolamblyops Murano, 1974

Scolamblyops Murano, 1974: 225–226 .

Scolamblyops – Mauchline 1980: 27 (in key to genera). — Nouvel et al. 1999: 79 (systematics). — Fukuoka & Murano 2006: table iii (pleopod morphology). — Wittmann et al. 2014: 336 (systematics). — Petryashov & Frutos 2017: 405 (in key to genera). — Mees & Meland 2024: AphiaID 226134 (accepted).

Type species

Scolamblyops japonicus Murano, 1974 , by original designation. So far only females known ( Murano 1974a; Fukuoka 2009).

Revised diagnosis

Diagnosis of Murano (1974a) revised to include male of S. muehlenhardtae sp. nov. (first male described for genus). Carapace without or with very short rostrum; disto-lateral edges well rounded. Eye rudiments mesially adjoining though not fused, not connected by a membranous integument, each reduced to roughly rectangular pad; lateral margin distally with one tooth-like non-sensory projection, no visual elements, no ocular papilla. Antennular trunk with three segments separated by transverse or slightly oblique articulations; basal segment without ventral carina. Antennal scale not subdivided, its bare lateral margin ending in a single, strong tooth; mesial margin setose all along. Antennal peduncle with three segments lined in a single plane. Clypeus with unpaired, anterior process. Thoracomeres and pleomeres normal. Thoracic endopod 2 not prehensile. Endopod 3 with oblique articulation between carpus and propodus. Marsupium formed by three pairs of well-developed oostegites. Female pleopods representing setose rods with residual differentiation of pseudobranchial lobe. Male pleopods biramous, with well-developed sympod and multi-segmented exopod. Endopod 1 short, unsegmented; endopods 2–5 long, multi-segmented; all endopods with small, setose pseudobranchial lobe. Both rami of uropods undivided, setose all around. Telson trapeziform, distally converging, terminally truncate. Spines densely set all along terminal margin and along distal half up to almost entire lateral margins. Terminal margin with pair of small paramedian spines on each side flanked by large spines continuously increasing in length laterally, leaving a characteristic triangular spine-free portion between left and right spine series; no setae.

Species included

– S. japonicus Murano, 1974 from the NW Pacific: off Japan, 35– 41° N, 138– 144° E, depth 570– 2055 m ( Murano 1974a; Fukuoka 2009)

– S. muehlenhardtae sp. nov. from the Southern Ocean: Drake Passage and Powell Basin, 59– 62° S, 47– 61° W, depth 1993–2920 m

Remarks

Pseudomma oculospinum W.M. Tattersall, 1951 , based on eye morphology, was acknowledged by Wittmann et al. (2014) as pertaining to the genus Pseudomma rather than to Scolamblyops as proposed by Murano (1974a).