Calcamariina moorea O’Loughlin & Skarbnik-López, 2015

O'Loughlin, P. Mark, Skarbnik-López, Jessica, Mackenzie, Melanie & VandenSpiegel, Didier, 2015, Sea cucumbers of the Kerguelen Plateau, with descriptions of new genus and species (Echinodermata: Holothuroidea), Memoirs of Museum Victoria 73, pp. 59-93 : 75-77

Calcamariina moorea O’Loughlin & Skarbnik-López sp. nov.

Zoobank LSID. http://zoobank.org:act:69F0EDED-FC18-4B0E-

8E48-203D73B6831D

Tables 1–3, 5, 6; figures 1, 4–6.

Cucumaria sp. nov. (HOL 14). Hibberd & Moore, 2009: 119, 146. Cucumaria kerguelensis (HOL 19). Hibberd & Moore, 2009: 119.

Material examined. Holotype. Southern Ocean , S Kerguelen Plateau, N of Heard Island, Western Plateau, AAD Southern Champion cruise 26 haul 156, beam trawl, -52.34 72.75, 274 m, 29 Apr 2003, TMAG H3436 ( AAD species code: HOLO 14 ).

Paratypes ( AAD species code: HOLO 14 ) . HIMI, S Shell Bank , SC26(251), 252 m, 8 May 2003, TMAG H3544 (1) ; Aurora Bank , SC26(178), 263 m, 1 May 2003, TMAG H3545 (1) ; Aurora Bank , SC26(189), 230 m, 2 May 2003, TMAG H3548 (2) ; Shell Bank , AA92(28), 230–247 m, 30 Jan 1992, NMV F85002 (1) ; North-east Plateau , HRD93(71S), 514–528 m, 28 Sep 1993, NMV F85003 (1) ; Heard I., HRD006, 60 m, 3 Oct 1985, NMV F85004 (1).

Description. Body fusiform, up to 29 mm long, curved semi-U-shaped body 16 mm wide/across in lateral view, mid-body diameter 6 mm (holotype TMAG H3436), slightly up-turned rounded oral end, up-turned tapered tail; body dark greybrown (holotype) to off-white (smaller types), hard, calcareous, covered with low rounded calcareous papillae each with apical terminal tube foot (most evident in larger holotype), tube feet more numerous ventrally than dorsally. Smallest specimens with poorly defined, narrow, ventral, mid-body inter-radii lacking papillae. Lacking anal papillae or scales. Tentacles dendritic, 8 large, 2 ventral small. Calcareous ring cucumariid-like, plates with high anterior radial and inter-radial prolongations, lacking posterior prolongations. Single polian vesicle. Two tufts of un-branched gonad tubules.

Ossicles of body wall and bases of papillae thick rod-plates, fewer narrow, elongate plates, irregular, perforated (frequently with two large parallel and two smaller distal perforations in cross formation centrally), elongate, single-layered, variably with surface and marginal knobs, never marginal spines, rod-plates and plates up to about 350 µ m long. Tube feet with endplates and support rod-plates; endplate diameters variable, up to about 240 µ m; tube foot wall supported by rod-plates, elongate, curved, variable form but typically with two large transverse central perforations and few distal small perforations, plate margin projecting from body wall sometimes with blunt denticulations, rod-plates up to about 220 µ m long.

Distribution. Southern Ocean, S Kerguelen Plateau, Aurora and Shell Banks, North-east Plateau, Western Plateau, Heard I., 60– 528 m.

Etymology. Named for Kirrily Moore, Collection Manager for Invertebrate Zoology in TMAG, with recognition of her initial sorting and curation and establishment of a voucher reference collection for the HIMI holothuroids, and with our appreciation of her generous collaboration with loan material and data relevant to our work.

Remarks. Calcamariina moorea O’Loughlin & Skarbnik-López sp. nov. is distinguished from Calcamariina hibberdi O’Loughlin & Skarbnik-López sp. nov. by the predominance of body wall rod-plates, with paired large central perforations and knobbed only part-margins. In contrast C. hibberdi has a predominance of body wall irregular plates that lack large central paired perforations and have part-margin spinous edges.

We judge that in Hibberd & Moore (2009, page 119) the photo of Cucumaria sp. nov. (HOL 14) is a photo of Calcamariina moorea O’Loughlin & Skarbnik-López sp. nov. And we judge that the photo of Cucumaria kerguelensis (HOL 19) on the same page is also a photo of C. moorea . TMAG types have been confirmed by direct observation of TMAG loan material. All were taken by Southern Champion cruise 26 and are registered in TMAG. There are probably more specimens of this new species held but not registered and not accessible in the AAD in Kingston.

As noted above for Calcamaria hibberdi O’Loughlin & Skarbnik-López sp. nov. the superficially similar species Neopsolidium kerguelensis ( Théel, 1886) that also occurs on the Kerguelen Plateau is distinguished from the Calcamariina species by the former having narrow bare ventral inter-radii, and cups and multi-layered ossicles in the body wall (illustrated here in Figure 6 ).

Figures

Figure 6. Microscope photos of ossicles from a specimen of Neopsolidium kerguelensis (Théel, 1886) (NMV F84997). a, multi-layered ossicle from the body wall; b, cross (bottom right) and cups from the body wall.