Hippaliosina imperfecta (Canu & Bassler, 1928a)

(Fig. 5F)

Gephyrophora imperfecta Canu & Bassler, 1928a: 86, fig. 1.

Hippaliosina imperfecta: Marcus, 1949: 26, fig. 40; 1955: 306, figs 78, 79; Winston et al., 2014: 209, fig. 44; Almeida et al., 2015a: 5; Almeida et al., 2017: 303, figs 60, 61; Bastos et al., 2018: table 1.

Material examined. Abrolhos Bank, Bahia State, Brazil: MNRJ-Bry1343, Parcel dos Abrolhos, 4 m depth, February 2014, col. R. Moura, G. Amado-Filho & A. Bastos.

Short description. Encrusting colony with zooids hexagonal or polygonal; frontal wall granular with only small, rounded areolar pores. Orifice rounded distally and concave proximally with a pronounced pair of condyles. A pair of avicularia, occasionally only one, located latero-distally to the orifice, rostrum elongated and triangular. Ovicell not observed.

Geographic distribution. Bahia, Espírito Santo and Rio de Janeiro states, Brazil (Marcus 1949, 1955; Winston et al. 2014; Almeida et al. 2015a; Almeida et al. 2017; Bastos et al. 2018).

Remarks. Hippaliosina imperfecta is characterized mainly by the paired avicularia (rarely one) with spearshaped rostra located latero-distally to the orifice. It resembles H. rostrigera (Smitt, 1873) but differs in the size of the orifice (shorter in H. rostrigera) and the shape/position of the avicularia (beginning above the orifice and with the rostrum slightly curved in H. rostrigera).