Trochosodon gordoni, Bock & Cook, 2004

Bock, Philip E. & Cook, Patricia L., 2004, A review of Australian Conescharellinidae (Bryozoa: Cheilostomata), Memoirs of Museum Victoria 61 (2), pp. 135-182 : 173

Trochosodon gordoni sp. nov.

Trochosodon multiarmatus .— Gordon, 1989: 83, p1. 49 figs D–F

(not Bipora multiarmata Maplestone, 1909: 268 ).

Etymology. Named for Dr Dennis P. Gordon.

Description. Colony domed, wider than high, calcification finely mamillate. Zooid orifices in quincunx, sinus rounded, peristomes raised slightly marginally. Rounded avicularia and large frontal septular pores scattered among orifices. Circular root pores adapical. Antapical surface with a few avicularia.

Remarks. Gordon (1989) identified specimens from New Zealand as Maplestone’s species and assigned them all to Trochosodon . He appears to have confused the dimensions of his colonies with those of Conescharellina multiarmata , that are always “higher than wide”, not “typically wider than high”, as he described. The broad orifice sinus of the New Zealand species is also quite unlike that of C. multiarmata . Gordon’s species lacks any basal cancelli and has one or two large, circular, central rhizoid pores adapically. It appears to be referable to Trochosodon but certainly not to Conescharellina multiarmata . Gordon figured a specimen from Station P927 (40°50.1'S, 168°14.8'E, 1005–1009 m, western South Island, New Zealand) and reported it from numerous other localities from southern New Zealand, from a range of 540 to 1676 m depth.