Opalia subcrassa
(Cotton & Godfrey, 1938)
Description:
Dimensions range from 13 mm - 13 mm high and 4 mm wide.
Width to height ratio: 0.31:1 ~ 0.31:1
Shell: Narrow; thick; small. About 11 whorls; protoconch with ~2 whorls fairly blunt, smooth; teleoconch with ~9 whorls flattened. Suture rather deep. Imperforate. Approximately 12 costae on the body whorl. Costae are thick, low, angled at the upper third, and obsolete at the suture. There is a single varix on each whorl. The varix is a further thick varix is situated in the middle back of the penultimate whorl. Base with indistinct keel. Aperture oval, not separate from the body-whorl,; outer lip as a thick varix.
Allied to Opalia apostolorum Iredale, but is larger, and also differs in that the basal rib is obsolete; the general appearance too is different.
Distribution:
Gulf St. Vincent, South Australia [Cotton & Godfrey, 1938:203]
Habitat:
40.2 m [22 fthms] [Cotton & Godfrey, 1938:203]
Etymology:
[latin] from sub = slightly, or somewhat and crassas = thick, fat or stout, meaning somewhat robust or moderately thick-shelled.
Type Material:
Holotype: (D. 13301) [as Scala (Nodiscala) subcrassa Cotton & Godfrey, 1938] - Type Locality: Gulf St. Vincent, S. Aust. [Cotton, B.C. & Godfrey, F.K., 1938]
Cotton, B.C. & Godfrey, F.K. (1938). Plate XVII. Fig. 13.
Scala (Nodiscala) subcrassa sp. nov. (X 4).
Distribution
as listed in source literature
Cotton, B.C. & Godfrey, F.K. (1938).
Shown in text as Scala (Nodiscala) subcrassa Cotton & Godfrey, 1938
Plate XVII. Fig. 13.
Scala (Nodiscala) subcrassa sp. nov. (X 4).
