SIPHOMARGINULINA McCulloch, 1981
Type species: Sip ho marginulina hybrida
McCulloch, 1981: OD.Siphontaryinulina
McCulloch. 1981 (*1962),
p. 82.Test elongate. compressed. periphery rounded and noncarinate, early chambers planispirally enrolled, only three to four chambers in the coil, final few chambers uncoiled and rectilinear, sutures radial in the early coil, oblique in the uncoiling part; wall calcareous. hyaline, translucent, finely perforate, surface smooth; aperture rounded at the dorsal angle, produced on a neck and bordered by a distinct lip with crenulate margin. Holocene; Caribbean Sea.