Carpocanopsis cingulata Riedel and Sanfilippo

Carpocanopsis cingulatum Riedel and Sanfilippo, 1971, p.1597, pl.2G, figs.17-21, pl.8, fig.8

Carpocanopsis cingulata Riedel and Sanfilippo, Sanfilippo and Riedel, 1973, p.531

DESCRIPTION

Cephalis obtusely cap-shaped, not separated from the thorax by an external collar structure. Thorax barrel-shaped, thick-walled (smaller and somewhat thinner in early specimens), with smooth surface and circular pores longitudinally aligned. Abdomen inverted truncate-conical, not distinguished in external contour from distal part of thorax, with rounded pores irregular in shape and arrangement. The termination of the abdomen is corroded in most specimens, but in a few is observed to consist of short, irregular, lamellar teeth (Riedel and Sanfilippo, 1971).

DIMENSIONS

Based on 25 specimens. Length of cephalis plus thorax 95-115 mm. Maximum breadth 85-115 mm (Riedel and Sanfilippo, 1971).

DISTINGUISHING CHARACTERS

Cephalothorax large and thick-walled, with pores longitudinally aligned. Abdomen inverted truncate-conical, not distinguished in external contour from distal part of thorax, with rounded pores irregular in shape and arrangement (Riedel and Sanfilippo, 1978a).

DISTRIBUTION

The morphotypic first appearance of this species is approximately synchronous with the boundary between the Dorcadospyris ateuchus and Lychnocanoma elongata Zones. It becomes extinct within the Calocycletta costata Zone. It is confined to low latitudes.