Plumarella undulata ( Zapata-Guardiola and López-González, 2010b ) TAYLOR & CAIRNS & AGNEW & ROGERS, 2013

TAYLOR, M. L., CAIRNS, S. D., AGNEW, D. J. & ROGERS, A. D., 2013, <strong> A revision of the genus <em> Thouarella </ em> Gray, 1870 (Octocorallia: Primnoidae), including an illustrated dichotomous key, a new species description, and comments on <em> Plumarella </ em> Gray, 1870 and <em> Dasystenella </ em>, Versluys, 1906 </ strong>, Zootaxa 3602 (1), pp. 1-105 : 99

Plumarella undulata ( Zapata-Guardiola and López-González, 2010b) , new combination

Thouarella undulata Zapata-Guardiola & López-González, 2010b: 133–135 , figs 2a,b, 3, 4

Material unavailable: Holotype, ZIZMH C11742, ANT XIX/5, sta. PS61/167–01, west of South Georgia, Antarctica, 53°23.68’S, 42°42.23’W, 306–342.7 m, 9 Apr 2002.

Material examined: Paratype, USNM 1123421, sample PS61/167–01, Antarktis XIX/5, R/ V Polarstern, west of South Georgia Island, sub-Antarctic, 53˚23’41”S, 42˚42’14”W, 306–342.7 m, 9 Apr 2002 .

Other material: USNM 98291, R/ V Eltanin, sta. 305, west of Sars Bank , Drake Passage, Chile, Antarctic, 59˚59’S/ 70˚43’W to 59˚58’S/ 70˚32’W, 2782–2827 m, 1 Nov 1962 , 2 colonies; USNM 99150, R/ V Polarstern, EPOS3 , sta. 295, AGT 26 , Queen Maud Land , Coats Land , Off Cape Norvegia, Antarctic, 71˚08’48”S, 13˚48’06”W, 2037 m, 21 Feb 1989; USNM 1129186 and USNM 1130315 (same location), R/V Eltanin, cruise 22, sta. 1536, 54˚30’S, 39˚20’31”W, 659–686 m, 8 Feb 1966 .

Description

Fully described in Zapata-Guardiola and López-González (2010b).

In addition to the original description, we would like to emphasize the radially arranged granules and striations on the outer surface of the operculars.

Distribution

Specimens from this study extend the known range of P. undulata across the southwest Atlantic Ocean and south to Cape Norvegia, Antarctica, 306–2827 m depth.

Remarks

Because the marginals of the polyps are long, spinose, and unkeeled, this species is considered to be a Plumarella (see Cairns, 2010).

The only character that differentiates P. diadema from P. undulata is the extreme longitudinal curving and outer surface striations of operculars on the polyps of the latter. The operculars of the polyps of P. diadema can be curved and the two largest tend to have some abaxial striations, however, less so than are found on P. undulata , and the majority of operculars are generally smooth.