Allotherenia sabulosa, Winston, Judith E. & Vieira, Leandro M., 2013

Winston, Judith E. & Vieira, Leandro M., 2013, Systematics of interstitial encrusting bryozoans from southeastern Brazil, Zootaxa 3710 (2), pp. 101-146 : 129

Allotherenia sabulosa sp. nov.

( Fig. 19 ; Table 17 )

Material examined. Holotype: MZUSP 762, near BIOTA Stn 205, 15 m. Paratypes: MZUSP 671, #1 [2 specimens], near BIOTA Stn 205, 15 m.

Etymology. From the Latin sabulosus, sandy; from sabulum sand.

Description. Colonies encrusting, unilaminar, on small mineral grains. Zooids relatively flat with regular small funnel-shaped pseudopores and 1–4 large marginal pores at the zooidal corners. Zooids have raised lateral edges, with distinct margin. Orifice almost circular with a shallow, subquadrate proximal sinus and small, downward sloping condyles. Peristome developed as a strong and conspicuous collar around the orificial fringe. Articulated oral spines absent. Avicularia absent. Ovicell hyperstomial, smooth ooecium, with raised proximal calcified band.

Remarks. A single colony of Allotherenia sabulosa sp. nov. was found on a sand grain from Station 211 and three additional specimens from near station 205.

Distribution. São Paulo state, Brazil.

Figures

FIGURE 19. Allotherenia sabulosa sp. nov.: A, colony encrusting the edge of a grain. B, group of zooids. C, an ovicelled zooid showing the collar-like peristome and smoothly calcified ovicell with raised proximal band. D, close-up of orifice showing subrectangular sinus. E, orifice of ovicelled zooid. Scale bars: A, 0.3 mm; B, C, 0.2 mm; D, E, 0.05 mm.

Tables

TABLE 17. Measurements (in mm) of Allotherenia sabulosa sp. nov..

	Lz	Wz	Lo	Wo	Lov	Wov
N	7	7	7	7	1	1
Mean	0.390	0.256	0.100	0.093	0.120	0.205
SD	0.035	0.015	0.008	0.012	-	-
Min	0.337	0.240	0.084	0.072	-	-
Max	0.446	0.289	0.108	0.108	-	-