Turbicellepora hansenae, 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 : 179-180

Turbicellepora hansenae sp. n. ( Fig. 2 a–g)

Material examined. Holotype: ZMUC-BRY-104, 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.

Etymology. Honorific for the late Danish bryozoologist Karen Emilie Bille Hansen (6 May 1919 – 27 December 2010).

Description. Colonies somewhat irregular and nodular, slightly yellowish, comprising 30 x 40 mm in size. Zooids semi-vertical in colony, highly distinct owing to deep interzooidal furrows ( Fig. 2 a, b), of variable size (0.7–1.0 x 0.5–0.7 mm ( Table 1). Frontal shield thick, smooth, with even slope and sparse marginal pores ( Fig. 2 c, d). Primary orifice transversely suboval, wider than high with fairly deep wide U-shaped sinus with sloping sides occupying much of proximal border ( Fig. 2 , b). Peristome of moderate height, rounded, asymmetrical, partly concealing primary orifice ( Fig.

2b, d). Oral avicularia 1–2, relatively large, with triangular mandible, located laterally near proximal part of orifice as continuation of peristome. Internal base of avicularian cystid wide, with 3 communication pores located on one side only; terminal (frontal) part of avicularium narrower, approaching form of a truncated cone. Rostrum directed frontolaterally, oval-triangular with tip hooked apically, crossbar complete, lacking columella ( Fig. 2 c, e). Additional similar columnar avicularia sporadically developed on frontal shields, these smaller in size, with rostrum directed proximally ( Fig. 2 d, e). A third type of adventitious avicularium present in ovicellate zooids, located in distal part of orifice ( Fig. 2 d, f), with prominent long, curved cystid, arching over ovicell opening; with complete crossbar and small semicircular mandible. Vicarious avicularium immersed, found only once, drop-like in form, with complete crossbar ( Fig. 2 g). Ovicell subglobular, prominent, sometimes with slight peak or crest in central part, with up to 20–25 unevenly distributed pseudopores ( Fig. 2 d–f).

Figures

FIGURE 2. Turbicellepora hansenae sp. n., holotype ZMUC-BRY- 104: a, part of colony; b, group of zooids with two types of adventitious pre-oral avicularia; c, primary orifice and pre-oral avicularium; d, base of avicularian cystid of one zooid, showing three communication pores, and another zooid showing the tubular form of a curved avicularium above the ooecial opening; e, an ooecium plus unequal adventitious avicularia; f, ovicellate zooids with different types of adventitious avicularia; g, two avicularia, one of them vicarious.