NONIONOIDES Saidova, 1975

 

 

Type species: Nonionina grateloupi d'Orbigny, 1826 (_*2303), p. 294: OD.

Nonionoides Saidova. 1975 (*2695), p. 248.Test slightly asymmetrical and weakly trochospiral, with evolute spiral side and nearly involute and deeply umbilicate opposite side, chambers of nearly constant height but increas­ing rapidly in breadth to result in an auricu­late test outline, sutures slightly depressed, particularly in the umbilical region, gently curved, sides flattened. periphery rounded: wall calcareous, perforate, hyaline, optically granular, transparent, surface smooth, but with pustules or small spinules bordering the umbil­ical rim of the chambers, in the vicinity of the aperture; aperture a low interiomarginal and equatorial arch. Holocene: sublittoral region. Atlantic. Caribbean. Pacific.