Turbicellepora greenlandica, Denisenko, Nina V., 2016

Denisenko, Nina V., 2016, Two new species of the genus Turbicellepora Ryland, 1963 (Bryozoa: Celleporidae) found on Lophelia coral from the Greenland slope, Zootaxa 4066 (2), pp. 177-182 : 178-179

Turbicellepora greenlandica sp. n. ( Fig. 1 , a–f)

Material examined. Holotype: ZMUC-BRY-103, fragment of colony, collected by a Canadian expedition research vessel, the Canadian Coast Guard Ship Martha Black at 60°22.3' N, 48°22.19' W, 886–932 m, March 2012. Paratype: ZIN – 1/50641, two parts of another colony, collection data as for holotype.

N Mean±SD Min-Max

Turbicellepora greenlandica sp. n.

Autozooid length 15 0.95±0.05 0.82-1.06 Autozooid width 15 0.58±0.04 0.55-0.65 Primary orifice anter width 8 0.13±0.03 0.18-0.02 Primary orifice anter length 8 0.15±0.02 0.15-0.16 Oral avicularium length 10 0.13±0.02 0.13-0.02 Oral avicularium width 10 0.09±0.01 0.09-0.10 Vicarious avicularium length 5 0.46±0.01 0.45-0.47 Vicarious avicularium rostral width 5 0.31±0.01 0.27-0.31 Vicarious avicularium postmandibular width 5 0.12±0.07 0.11-0.01 Turbicellepora hansenae sp. n.

Autozooid length 8 0.84±0.03 0.74-0.90 Autozooid width 8 0.62±0.05 0.50-0.71 Primary orifice anter width 8 0.19±0.02 0.17-0.22 Primary orifice anter length 8 0.16±0.02 0.14-0.17 Oral avicularium length 8 0.21±0.07 0.18-0.24 Oral avicularium width 8 0.13±0.05 0.12-0.15 Vicarious avicularium length 1 - 0.42 Vicarious avicularium rostral width 1 - 0.33 Vicarious avicularium postmandibular width 1 - 0.11 Etymology. Alluding to the provenance of the species.

Description. Colonies partly laminar or lumpy, white, comprising small patches 30 x 40 mm in size. Zooids situated in horizontal plane or semi-vertical, rising in their distal part, convex, highly distinguishable because of deep interzooidal furrows ( Fig. 1 a), large (0.8–1.0 x 0.5–0.6 mm ( Table 1). Frontal shield thin, weakly textured, with sparse marginal pores ( Fig 1 b). Primary orifice transversely suboval, wider than long, the wide sinus occupying much of proximal border, with sloping sides ( Fig. 1 c, e). Peristome raised, thin, lower midproximally and flanked by lateral lobes when fully formed ( Fig. 1 b, d, f). Usually 1 peristomial oral avicularium, rarely 2, prominent, subcolumnar, with triangular mandible ( Fig. 1 d, e); base of avicularian cystid oval, narrowing frontally to subconical, connected with zooids by a single pore. Avicularium surface inclined to orifice, its rostrum directed frontolaterally at angle of 45º to zooidal frontal shield. Additional subcolumnar avicularia sporadically developed on frontal shields of autozooids at distal corners, not far from peristome; these of similar shape to oral avicularia ( Fig. 1 b), but can be larger or smaller. Both avicularium types with crossbar lacking columella; rostra triangular, slightly hooked apically. Vicarious avicularia prominent, frequent, large, pyriform, with narrow proximal part and spatulate mandible; crossbar without columella but small protuberances may be seen on ( Fig. 1 f). Ovicell prominent, subglobular on zooidal surface, slightly variable in form, being sometimes longer than wide, with 20–25 pseudopores ( Fig. 1 d, f).

Distribution. Southern part of Davis Strait, southwest of Greenland, 886– 932 m.

Figures

FIGURE 1. Turbicellepora greenlandica sp. n., holotype ZMUC-BRY- 103: a, part of colony with differently directed zooids and several vicarious avicularia; b, d, zooids showing the form of single and paired lateral peristomial avicularia and ovicellate zooids; c, primary orifices; e, autozooid with unequal avicularia, the base of the one at left with an incomplete communication pore; f, vicarious avicularium.