Millepora alcicornis Linnaeus, 1758

Synonyms in the area: Millepora alcicornis var. cellulosa Verrill, 1868 [polyp]; Branner 1904; Millepora alcicornis var. digitata —Verrill 1868; Branner 1904 [polyp]; Millepora alcicornis var. fenestrata —Verrill 1868; Branner 1904 [polyp].

Distribution in South America: polyp—Atlantic Ocean, Brazil, from 0.4°S to 23.50°S (Hartt 1868; Verrill 1868; Branner 1904; Laborel 1969a; Weerdt 1984; Pires et al. 1992; Hetzel & Castro 1994; Castro et al. 1995; Amaral 1997; Amaral et al. 1997, 2002a, 2006, 2007, 2008, 2009; Calder & Maÿal 1998; Kelmo & Santa Isabel 1998; Hudson et al. 1999, abstract; Castro & Pires 2001; Castro & Segal 2001; Migotto et al. 2002; Ramos et al. 2009; Gondim et al. 2011; Leal et al. 2013; Dias & Gondim 2016).

Habitat: polyp—on calcareous and other algae, mud, gorgonians, Millepora sp. skeleton sandstone reef, and scleractinian Agaricia agaricites (Amaral 1997; Calder & Maÿal 1998; Amaral et al. 2008).