Bryopesanser crebricollis, Tilbrook, Kevin J., 2012

Tilbrook, Kevin J., 2012, Review of the bryozoan genus Bryopesanser Tilbrook, 2006 (Escharinidae: Cheilostomata) with the description of 11 new species, Zootaxa 3165, pp. 39-63 : 57

Bryopesanser crebricollis n. sp.

(Figures 43–45, Table 1)

Material. Holotype (here selected): NHMUK 2000.2.23.6, Siboga Stn 164, west of north end of New Guinea, 1°45’5” S, 130°47’5” E, 32 m, 20 August 1899.

Description. Colony large, approx. 12 mm 2. Autozooids 0.50–0.70 x 0.30–0.40 mm, irregularly polygonal, distinct, separated by shallow grooves. Frontal shield pustulate, slightly convex, evenly perforated by numerous small multiporous pores, areolar septular pores at each lateral and proximal angle. Primary orifice as wide as long, ca 0.10 x 0.10 mm excluding sinus, anter deeply arched, proximal border straight, condyles slightly denticulate, sinus drop-shaped, as wide as long. Oral spines 7, evenly spaced. Proximal peristome slightly flared, surrounded by thickened collar of calcification, no median mucro. Avicularia originating between the most proximal pairs of spines, rostra medium-sized, with smooth edges, open-ended distally, crossbar complete, distomedially directed, mandibles fan-shaped. Ovicell hyperstomial, producing a thickened proximal edge, sometimes with a raised process frontally. Ovicellate zooids with 6 oral spines, the distalmost pair incorporated into ovicell.

Etymology. Latin creber, thick; collum, neck, alluding to the discernible rim of calcification below the peristome.

Remarks. Bryopesanser crebricollis n. sp. is characterised by the details of the primary orifice with its straight proximal border, slightly denticulate condyles, and the slightly flared peristome surrounded by a thickened collar of calcification. The position of the avicularia is also characteristic as is the pustulate nature of the frontal shield.

Bryopesanser crebricollis n. sp. differs from B. pesanseris in the pustulate nature of the frontal shield and the slightly flared peristome surrounded by thickened collar of calcification.

Distribution. Bryopesanser hebelomaia n. sp. is based on a single specimen from New Guinea.