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.