Amathillopsis grevei Barnard, 1961

Lörz, Anne-Nina & Peart, Rachael A., 2023, Amathillopsidae (Crustacea: Amphipoda) from New Zealand, Including the Description of a New Species, Records of the Australian Museum (Rec. Aust. Mus.) 75 (4), pp. 459-470 : 465

Amathillopsis grevei Barnard, 1961

Holotype: Male, 13 mm, Tasman Sea , 44°18'S 166°46'E, 3580 m, clay, 17 January 1952.

Diagnosis (after Barnard, 1961). Eyes absent; dorsal projections reaching maximum length on pereonite 7; pleonites 1–2, sometimes 3, smooth; dorsal projections commencing as small elements on pereonite 3 and increasing progressively in size through pereonite 7; anterior corners of first 4 coxae angular but not very sharp and not attenuated; coxae relatively short, quadrate; posterior lobes on propodus of gnathopods blunt, not attenuated; posterior margin of gnathopod 2 ischium slightly but not grossly lobate and bearing small marginal robust setae, this condition slightly developed on gnathopod 1; posteroventral corners of epimeron 2 and 3 greatly reduced evident; posterior end of pleonite 6 with small medial tooth; telson broad, short, apically emarginate.Accessory flagellum composed of single slender article tipped with 2 or 3 setae.

Remarks. As discussed by LÖrz & Horton (2021), care should be taken in use of the relative sizes of the dorsal processes in distinguishing species because these are likely to vary ontogenetically, as in the two type specimens of Amathillopsis inkenae LÖrz & Horton, 2021, where the larger male paratype has more pronounced, acute processes than the smaller male holotype. This is also likely to occur in other species in the genus. We consider the possibility that Amathillopsis grevei , which is only known from a single specimen of 13 mm, was described from an immature specimen.