homotrema homotrema homotrema is a genus of foraminifers belonging to the family homotrematidae. homotrema scientific classification domain: eukaryota clade: diaphoretickes clade: sar phylum: retaria infraphylum: foraminifera class: globothalamea order: rotaliida family: homotrematidae genus: homotremahickson, 1911 the species of this genus are found in subtropical and tropical regions. species: homotrema hemispherica mcculloch, 1977 homotrema pacifica mcculloch, 1977 homotrema rubra (lamarck, 1816) homotrema singaporensis mcculloch, 1977