Hyptiotheca Bengtson, 1990a

Malinky, John M. & Skovsted, Christian B., 2004, Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland, Acta Palaeontologica Polonica 49 (4), pp. 551-578 : 560

Genus Hyptiotheca Bengtson, 1990a

Type species: H. karraculum Bengtson, 1990a .

Diagnosis.—Conchs with ovoid cross−section and ventrally directed longitudinal curvature. Ligula semi−elliptical, at 120° to dorsal apertural margin. Surface sculpture of distinct growth lines and faint longitudinal striations. Opercula with broad cardinal shield, well−defined tectula, cardinal processes about 3 lengths of the operculum width, thickened central field on inner surface, and no clavicles (from Bengtson 1990a).

Stratigraphic range and distribution.—Lower Cambrian; Australia, Antarctica, Siberia, South China, Nova Scotia, New York State, and North−East Greenland.