Reptadeonella bipartita ( Canu & Bassler, 1928a )

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: 160

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Reptadeonella bipartita ( Canu & Bassler, 1928a )


Reptadeonella bipartita ( Canu & Bassler, 1928a) 

( Figs 2FView FIGURE 2, 7CView FIGURE 7)

Adeona bipartita Canu & Bassler, 1928a: 37  , fig. 2; Marcus 1949: 25, figs 37–39;

Reptadeonella bipartita: Winston, 1986: 24  , fig. 50; Almeida et al., 2015b: 353, figs 6–9; Bastos et al., 2018: table 1. Additional synonymies in Almeida et al., (2015b).

Material examined. Abrolhos Bank, Bahia State, Brazil: MNRJ-Bry1364, Parcel dos Abrolhos, 15 m depth, February 2014, col. R. Moura, G. Amado-Filho & A. Bastos. 

Description. Colony encrusting, forming extensive layers inside and on the external surface of the cores. Autozooids rhomboidal, longer than wide (450–567–648 µm long x 364–404–435 µm wide) with an elliptical transverse orifice (63–69–76 µm long x 90 –103–117 µm wide); peristome not developed; frontal shield finely crenulate, one line of circular to oval areolar pores around the margin and sometimes a second line of smaller pores close to the avicularium and above the orifice. Spiramen crescentic, inside the deep circular pore located just below the avicularium. Single, suboral, median avicularium (155–193–209 µm long) located between the orifice and spiramen, directed distally; rostrum triangular with point resting on the proximal border of the peristome; short condyles.

Geographic distribution. Caribbean ( Almeida et al. 2015b); Brazil: Alagoas, Bahia, Espírito Santo states ( Almeida et al. 2015a, b; Bastos et al. 2018; present study).

Remarks. Almeida et al. (2015b) mentioned that the number of Reptadeonella  species from Brazil is uncertain due to historical taxonomic mistakes attributing records of this genus to R. violacea ( Johnston, 1847)  . In their paper, these authors redescribed R. bipartita  and R. costulata Canu & Bassler, 1928  , and added R. granulosa Winston & Vieira, 2013  , R. brasiliensis  , R. cucullata  , R. leilae  and R. aspera Almeida et al., 2015b  ( Marcus 1939, 1949; Almeida et al. 2015b). In addition to R. bipartita  , there are some other species with suboral avicularia directed longitudinally to the orifice: R. aspera  and R. brasiliensis  have a shorter suboral avicularium than R. bipartita  , and R. violacea  has a rounded spiramen and sometimes an avicularium directed obliquely to the orifice (absent in Brazilian material). Features of R. bipartita  collected from Abrolhos Bank are very similar to the type material ( Canu & Bassler 1928a), including the position and shape of the avicularia, spiramen and orifice. However, the type material has longer autozooids (600–700 µm; cf. 450–648 µm at Abrolhos) but this difference is insufficient to separate these as different species, especially in view of the fact that environmental factors, such as food supply and water temperature, are known to influence zooid size in other bryozoan species (e.g. Lombardi et al. 2006; O’Dea et al. 2007).














Reptadeonella bipartita ( Canu & Bassler, 1928a )

Ramalho, Laís V., Taylor, Paul D., Moraes, Fernando Coreixas, Moura, Rodrigo, Amado-Filho, Gilberto M. & Bastos, Alex C. 2018


Adeona bipartita

Canu & Bassler, 1928a : 37 Marcus 1949 : 25