Tridentella Richardson, 1905

Bruce, Niel L. & Svavarsson, Jörundur, 2018, Three new species of Tridentella Richardson, 1905 (Isopoda: Cymothoida: Tridentellidae) from New Caledonia, Zootaxa 4399 (1), pp. 101-118 : 102-103

Tridentella Richardson, 1905 —annotated species list

Ornate species

T. acheronae Bruce, 1988 ; New Zealand; 424–1006 m.

T. cornuta Kussakin, 1979 ; northwestern Pacific; 907– 935 m. Male with three head spines, pereonite 1 with three anterior median spines; pleotelson rounded, with low radiating ridges; female with pleotelson as for male, but no head spines.

T. glutacantha Delaney & Brusca, 1985 ; California; it is possible that two species are included under this namethe male pleotelson is not marginally serrate whereas the female allotype has prominent marginal serrations, this being a character usually present in both sexes ( Bruce 2002), the female antennula and antenna is longer than that of the holotype and the uropodal endopod shape appears to differ between the holotype and allotype; 128– 360 m.

T. katlae sp. nov. New Caledonia; pleotelson lateral margins serrate; 150–200 m.

T. namibia Brandt & Poore, 2001 ; off Orange River, Namibia; 175–351 m; acute short spines all over, pleotelson rounded, spines forming weakly radiating rows, eyes large, head with some low nodules.

T. ornamenta ( Menzies & George, 1972) ; Peru– Chile trench; 907–935 m.

T. ornata ( Richardson, 1911) ; Atlantic coast of USA, shallow; T. williamsi Delaney, 1990 is a junior synonym ( Kensley and Heard, 1997); large eyes; pleotelson lateral margins strongly serrate; shallow to 168 m.

T. quinicornis Delaney & Brusca, 1985 ; California; 53 m; weakly ornamented, head with four dorsal nodules (not 5, the fifth perhaps refers to the rostrum).

T. rosemariae Bruce, 2002 ; New Zealand; 550–1840 m.

T. sculpturata Kussakin, 1955 , northwestern Pacific; small (6–12 mm); male with posterior margins ornamented, pleotelson with 5 longitudinal ridges; 70– 96 m.

T. vitae Bruce, 1984 ; Fiji; Lateral margins of pleotelson with overlapping ‘scales’; small size (6.9–9.5 mm); 360 m.

T. brandtae Bruce, 2008 ; Banda Sea , Indonesia; very finely nodular, appearing plain; 425 m.

Smooth-bodied species with pleotelson carinae

T. tangeroae Bruce, 1988 ; New Zealand; 90–94 m.

T. saxicola ( Hale, 1925) ; New South Wales, southern Great Barrier Reef; the only species of the family known from coral reefs ( Bruce 1984); 10–134 m.

No ornamentation

T. benguela Brandt & Poore, 2001 ; off Orange River, Namibia; not ornamented, figured with weakly radiating ridges; possibly juvenile of T. namibia ; 285 m.

T. japonica Thielemann, 1910 ; Japan; c. 600 m.

T. laevicephalax Menzies, 1962 ; shallow, not ornamented ( Carvacho 1977); Chile.

T. magna sp. nov. New Caledonia; large (36 mm), head with three small tubercles, otherwise smooth; 760 m.

T. memikat Bruce, 2008 ; Kei Is., Indonesia; 620–809 m.

T. palmata sp. nov. New Caledonia, 260–390 m.

T. recava Bowman, 1986 ; off New York; smooth, characterised by a deeply excavate pleotelson apex; 180–304 m.

T. tanimbar Bruce, 2008 ; Banda Sea , Indonesia; 410 m.

T. virginiana ( Richardson, 1900) ; Virginia, USA; type species; smooth bodied, in need of redescription as there are no good figures for this species; head with four small tubercles; 53 m.