Synthecium tubithecum (Allman, 1877)

Distribution in South America: polyp—Atlantic Ocean, Brazil, from 7.55°S to 8.92°S, at 20.50°S 29.37°W, from 21.25°S to 23.40°S (Vannucci 1950, 1951a, 1951b; Maÿal 1973, 1983; Migotto et al. 2002; Grohmann et al. 2003; Shimabukuro 2007; Miranda et al. 2015).

Habitat: polyp—on sponge (Shimabukuro 2007).