CONICOSPIRILLINOIDES T. C. Cheng and S. Y. Zheng, 1978

 

 

Type species: Spirillina semidecorata Heron-Allen and Earland, 1915 (*1472), p. 685; OD.

Conicospirillinoides T. C. Cheng and S. Y. Zheng, 1978 ( *557), p. 218. 262.

Test with globular proloculus and undivided planispirally enrolled tubular second cham­ber, wall extending into a high spiralling flange bordering the whorls that partially overlaps the umbilical region and slopes sharply upward considerably beyond the chamber lumen, surface of the flange bearing numerous curved radial indentations that are slightly oblique to the periphery and spiral suture and falsely appear to represent internal septa, but pres­ent only on the flanges and do not subdivide the chamber lumen; on the flattened umbili­cal side similar but horizontal flanges extend from the inner chamber margin, covering the umbilical region with thick lamellae that have a papillate surface with numerous rounded bosses; aperture at the end of the tubular chamber at the periphery. Holocene; S. Pacific: Torres Straits; S. China Sea: Xisha Islands; Indian Ocean: off N. Mozambique.

 

Remarks: Originally placed in the Spirillina, Conicospirillinoides is here transferred to the Planispirillinidae because of the pres­ence of the umbilical flanges.