PSEUDOHELENINA Collins, 1974

 

Type species: Discorbis collinsi Parr, 1932 (*2356), p. 230; OD.

Pseudohelenina Collins. 1974(*647), p. 37.Test trochospiral, biconvex, all of the two to three whorls visible on the more convex spiral side, chambers enlarging gradually, sutures depressed, oblique and curved back at the periphery, only the six chambers of the final whorl visible and sutures radial and depressed around the deeply indented umbilicus on the flatter umbilical side, the deeply incised sutures giving the appearance of sutural slits around the umbilicus, periphery broadly rounded. peripheral margin lobulate; wall calcareous, hyaline, optically radial, moder­ately coarsely perforate except for a small clear area on the distal face of the final chamber. surface smooth; primary aperture interiomarginal, umbilical, bordered with a small projecting flap, secondary sutural apertures on the spiral side, subtriangular in outline and extend along the spiral and septa[ sutures for a short distance, those of early chambers closed secondarily. Pleistocene to Holocene; Australia: Victoria.