Gemelliporina glabra (Smitt, 1873)

(Fig. 6A)

Gemellipora forma glabra (typica) Smitt, 1873: 37, figs 208–210.

Gemellipora glabra: Busk, 1884: 176, fig. 3; Canu & Bassler, 1928b: 98, figs 1–7;

Gemelliporina glabra: Marcus, 1939, fig. 14A, B; Osburn, 1940: 426; Winston, 2005: 89, figs 247–256; Vieira et al., 2008: 29; Almeida et al., 2015a: 5; Bastos et al., 2018: table 1.

Material examined. Abrolhos Bank, Bahia State, Brazil: MNRJ-Bry1348, California Reef, 25 m depth, March 2015, col. F.C. Moraes, R. Moura, G. Amado-Filho & A. Bastos.

Short description. Fragments of erect colonies with zooids oval to claviform, without visible demarcation between adjacent zooids, which may be a preservational artefact; frontal wall with sparse pores and granular calcification; orifice keyhole-shaped; scattered oval avicularia observed on the frontal surface (Fig. 6A).

Geographic distribution. Gulf of Mexico. Brazil: Pernambuco, Bahia and Espírito Santo states (Busk 1884; Canu & Bassler 1928; Marcus 1939, 1955; Almeida et al. 2015a; Bastos et al. 2018; present study).

Remarks. Three species have been assigned to Gemelliporina: G. hastata Winston & Woollacott, 2009, G. punctata (Canu & Bassler, 1929) and G. glabra (Smitt, 1873) (bryozoa.net; accessed 01.03.2018). Gemelliporina glabra is distinguished from G. punctata and G. hastata principally because these species have peristomial avicularia. The Abrolhos specimen was found at 25 m deep inside the reef matrix.