Uristes Dana 1849

Uristes Dana, 1849

(Fig. 49, 50)

Uristes Dana, 1849: 136.— Dana, 1852: 209.— Dana, 1853: 917.— Bate, 1862: 89.— Stebbing, 1906: 63.— Stephensen, 1929: 64.—J.L. Barnard, 1962: 35.— Hurley, 1963: 91.—J.L. Barnard, 1969: 367.— Ledoyer, 1986: 816.— Barnard & Karaman, 1991: 538.— Lowry & Stoddart, 2003: 284 (catalogue).

Uristoides Schellenberg, 1931: 27.— Barnard & Karaman, 1991: 539 (in part).

Type species. Uristes gigas Dana, 1852, monotypy.

Included species. Uristes contains 2 species: U. gigas Dana, 1849; U. subchelatus (Schellenberg, 1931).

Incertae sedis. Uristes abyssi (Norman, 1900) (family unknown); U. albinus (K.H. Barnard, 1932) (family unknown); U. dawsoni Hurley, 1963 (family unknown); U. entalladurus J.L. Barnard, 1963 (Lysianassidae, Tryphosinae); U. georgianus (Schellenberg, 1931) (family unknown); U. natalensis K.H. Barnard, 1916 (family unknown); U. paramoi (Schellenberg, 1931).

Removals. Uristes perspinis J.L. Barnard, 1967 to the tryphosine genus Cedrosella Barnard & Karaman, 1987 based on gnathopod 1 with a tapering first coxa and a short carpus, a non-constricted inner ramus on uropod 2 and a moderately cleft telson.

Uristes abyssalis (Stephensen, 1925) is tentatively removed to the tryphosine genus Gronella Barnard & Karaman, 1991, based on mandible molar triturating, gnathopod 1 coxa is slightly tapering, carpus short, propodus margins subparallel and the telson moderately cleft. The condition of the male antenna 2 peduncle (with or without brush setae) and the condition of the inner ramus of uropod 2 (constricted or not) needs to be verified to confirm the generic placement.

Uristes barbatipes (Stebbing, 1888) is removed the tryphosine genus Tasmanosa Lowry & Kilgallen, 2014 based on the well-developed antenna 1 accessory flagellum and the triturating molar, maxilla 2 inner plate slightly shorter than outer, the distinctive carpus and propodus of gnathopod 1.

Uristes serratus Schellenberg, 1931 and U. yamana Chiesa & Alonso de Pina, 2007 appear to be congeneric, and belong to a yet to be described genus in the Uristidae based on the absence of a callynophore in the female and apparently in the male, the compressed carpus of gnathopod 1 and the cleft telson.

Uristes adarei (Walker, 1903); U. antennibrevis J.L. Barnard, 1962; U. californicus Hurley, 1963; U. mediator J.L. Barnard, 1962; U. stebbingi (Walker, 1903); U. sulcus Griffiths, 1974 are removed to the tryphosine genus Tryphosella Bonnier, 1893 based on the triturating molar, maxilla 1 with a 6/5 setal-tooth arrangement, the tapering coxa of gnathopod 1.

Uristes velia J.L. Barnard, 1961 is removed to the tryphosine genus Cheirimedon Stebbing, 1888 based on the maxilla 1 setal-tooth arrangement; gnathopod 1 carpus short and propodus margins subparallel; pereopod 4 with weak posteroventral lobe; and telson deeply cleft.

Diagnostic description. [based on type species] Antenna 1 peduncle article 1 without anterodistal lobe; accessory flagellum not forming cap covering callynophore or flagellum with an elongate article 1 (at least twice as long as article 2) partially covering callynophore. Antenna 2 without brush setae. Mandible molar ridge-like, narrow, setose with narrow distal triturating surface. Maxilla 1 outer plate a well developed 7/4 crown. Maxilla 2 inner plate slightly shorter than outer plate. Gnathopod 1 subchelate; coxa 1 large, about as long as coxa 2, subrectangular with straight anterior margin or distally subovate; ischium short (length less than 2 × breadth); carpus short (length 1 to 2 × breadth) to long (length 2 to 4 × breadth); propodus margins subparallel or slightly tapering. Uropod 2 inner ramus not constricted. Telson deeply cleft.

Remarks. As Chisea & Alonso (2007) point out Uristes is in need of revision. The diagnosis provided here is based on the type species. Of the 23 species currently assigned to Uristes, only two remain. Eight of these species are so poorly described that they cannot be placed.

Based on the subchelate first gnathopod with a large coxa with a straight anterior margin and a short carpus Uristes appears to be most similar to the Arctic/boreal genera Anonyx and Onisimus. It differs from both in having a ridge-like narrow setose molar with a distal triturating surface and in not having an accessory flagellum cap.

Distribution. Southern Ocean and southern Australian waters.