HELICOSTEGINA R. W. Barker and Grimsdale. 1936
Type species: Helicostegina dimorpha
R. W. Barker and Grimsdale, 1936; OD.Helicostegina
R. W. Barker and Grimsdale. 1936(*
138), p. 233.Helicolepidinoides
Tan, 1936 (*3117), p. 992: type species: Helicostegina gyrali
R. W. Barker and Grimsdale. 19361*1381, p. 236; OD.Test lenticular, early chambers in an involute trochospiral coil, later ones subdivided ventrally to form small chamberlets in early species or subdivided on both sides in later species, adult test with peripheral flange and arcuate chambers in annular series around the periphery of the juvenile stage; wall surface pustulose to papillose; aperture a narrow slit near the inner margin of the final chamber. M. to U. Eocene; Trinidad; Mexico.