Kiaeroceras sp. E

Figs 37A, 40F

Material examined

ESTONIA • 1 spec.; Vormsi Island, Saxby shore (N); Kõrgessaare Formation, Vormsi Regional Stage; GIT 878-21 .

Description

The specimen is a fragment of a mature body chamber and nine chambers of the phragmocone (Fig. 40F). The body chamber is straight and tubular with a conch height of ca 48 mm. The phragmocone is slightly endogastrically curved. The adoral-most two septa are crowded. The phragmocone increases in height from 44 mm to 47 mm at a length of 34 mm (angle of expansion = 5°). The sutures are directly transverse and straight. The siphuncle is near the conch margin, its segments are strongly expanded within the chambers with a height of 8 mm where the conch height is 46 mm, and the chamber length is 5 mm (SCR = 1.6). The septal necks are cyrtochoanitic. Endosiphuncular bullettes occur (Fig. 37A).

Remarks

The specimen is similar to K. urgense sp. nov. with respect to the low angle of expansion of the phragmocone and the size and shape of the mature body chamber. It differs from the former in lacking the constriction at the phragmocone and in having a smaller angle of expansion. It cannot fully be compared with other species of the genus because the conch cross section is not preserved, and the specimen is therefore left in open nomenclature.