Gemelliporina glabra ( Smitt, 1873 )

Ramalho, Laís V., Taylor, Paul D., Moraes, Fernando Coreixas, Moura, Rodrigo, Amado-Filho, Gilberto M. & Bastos, Alex C., 2018, Bryozoan framework composition in the oddly shaped reefs from Abrolhos Bank, Brazil, southwestern Atlantic: taxonomy and ecology, Zootaxa 4483 (1), pp. 155-186 : 176

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.

Figures

FIGURE 6. Scanning electron micrographs of three bryozoan species. A. Gemelliporina glabra, fragment showing orifices and a small avicularium. B, C. Plesiocleidochasma acuminata n. sp. B. General view of a fragment showing infertile zooids. C. Detail of some zooids showing cleithridiate orifices, a few scattered areolar pores and acuminate avicularia with rostra ending in a sharp and elongate tip. D–F. Rhynchozoon aff. rostratum. D. General view of a colony part showing some zooids with peristomial tubercles and frontal avicularia. E. Detail of some autozooids showing peristomial tubercles and frontal, triangular avicularia. F. Detail of one zooid showing distally beaded orifice and a suboral lateral avicularium with a triangular rostrum, and a suboral umbo.