Abyssorchomene distinctus ( Birstein & Vinogradov, 1960 )

Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), Zootaxa 3867 (1), pp. 1-92 : 8-9

publication ID	https://doi.org/ 10.11646/zootaxa.3867.1.1
publication LSID	lsid:zoobank.org:pub:B7C6EC5F-5AA3-43B1-BD3D-D8111E0EC3A7
DOI	https://doi.org/10.5281/zenodo.5590160
persistent identifier	https://treatment.plazi.org/id/03AE8B60-AC01-FFD0-6CC1-FB51FC3BC2BC
treatment provided by	Felipe
scientific name	Abyssorchomene distinctus ( Birstein & Vinogradov, 1960 )
status

Treatment

Abyssorchomene distinctus ( Birstein & Vinogradov, 1960) View in CoL View at ENA

Orchomene distinctus Birstein & Vinogradov, 1960: 191 , fig. 10.

Orchomene (Abyssorchomene) distinctus .— Barnard & Ingram, 1990: 22, figs 12–14.— Vinogradov, 1993: 43.

Abyssorchomene distinctus View in CoL .—? Thurston, 1990: 264 (ecology).— Lowry & Stoddart 2003: 281.— Jamieson, Kilgallen, Rowden, Fujii, Lorz, Kitazawa & Priede, 2011: 55, table 3, 58, table 6 (ecology).—Horton, Thurston & Duffy, 2013: 355, table 2 (ecology).

Orchomene distinctus .— Barnard & Karaman, 1991: 508.

Orchomenella distinctus .— Lowry & Stoddart 1994: 181.

Types. Unknown.

Type locality. Near Palau, western South Pacific Ocean (5°02'N 135°33’E) 4732 m, trawl 0–2000 m; East Pacific vent region 13°N, 2635 m GoogleMaps .

Material examined. 1 female, AM P.70533, east of Sydney , New South Wales, Australia (33°50.9’S 152°15.2’E), 3178–4860 m, Isaacs-Kidd midwater trawl, 26–27 April 1989, J. R GoogleMaps . Paxton, NMAS Cook [ JP 89-2 ] ; 1 specimen, AM P.96583, Hill D 1, south-southeast of South East Cape (44°23.4'S 147°16.2'E), 1942 m, baited trap, 31 January 1997, CSIRO GoogleMaps party on FRV Southern Surveyor , FRV Southern Surveyor [SS01/97/65] .

Diagnostic description. Mandible molar setose with triturating surface. Maxilla 2 inner plate significantly shorter than outer plate. Gnathopod 1 subchelate; coxa 1 large, about as long as coxa 2, subtriangular, adze-shaped; ischium not enlarged; propodus margins subparallel; palm transverse, slightly convex. Gnathopod 2 subchelate; palm transverse, margin sinusoidal. Pereopod 7 basis tapering distally. Epimeron 3 posteroventral corner broadly rounded. Telson moderately cleft .

Remarks. Abyssorchomene distinctus has a broadly rounded posteroventral corner on epimeron 3 such as A. charcoti, A. musculosus and A. nodimanus . Gnathopod 1 is subchelate in A. distinctus and A. musculosus (parachelate in A. charcoti and A. nodimanus ). There is little difference between A. distinctus and A. musculosus . The palm of gnathopod 1 is slightly convex in A. distinctus (straight in A. musculosus ) and the setal-teeth on maxilla 1 appear to be more slender, but this could be the angle of the illustration. In other respects they appear to be the same.

Depth range. 2635–5173 m ( Barnard & Ingram 1990, Jamieson et al. 2011).

Distribution. Pacific Ocean: Near Palau (5°02'N 135°33’E) ( Birstein & Vinogradov 1960); East Pacific vent region 13°N ( Barnard & Ingram 1990); Loyalty Islands ( Lowry & Stoddart 1994); Kermadec Trench ( Jamieson et al. 2011). North Atlantic Ocean. Cape Verde Plain ( Thurston 1990).