ARENOPARRELLA Andersen, 1951
Type species: Trochammina inflata (Montagu) var. mexicana Kornfeld, 1931 (*1721), p. 86; OD.
Arenoparrella Andersen, 1951(*31), p. 31; also see Andersen, 1951 (*32), p. 96.
Test free, in a low trochospiral coil, chambers increasing gradually in size, sutures radial, periphery rounded; wall of proloculus entirely proteinaceous, without foreign particles, remainder of wall finely agglutinated on a proteinaceous base, surface smooth and polished; primary aperture a straight to curved slit beginning at or near the base of the apertural face, slightly to the spiral side of the equatorial position and directed upward at an angle to the plane of coiling, across the median plane in a gentle curve or with a distinct angle to end near the center of the face, aperture surrounded by a thin and delicate lip that may extend across the base so that the aperture becomes areal rather than interiomarginal, supplementary openings present at the apex of the final chamber. Holocene; USA: Louisiana, Texas; W. Atlantic, E. and W. coasts of Trinidad.