PRAEKARAISELLA Kurbatov, 1972

 

 

Type species: Praekaraisella vandobensis Kurbatov, 1972 (as "vondobensis, " pl. 5, figs. 7, 8); OD.

Praekaraisella Kurbatov. 1972 (*1759), p. 11.

Test may be streptospiral in the early stage and later planispiral, or may be planispiral throughout, semi-involute, biumbilicate, laterally compressed, final one or two chambers uncoiled and rectilinear, periphery subacute; wall agglutinated, and may show a "fibrous" structure in the outer part, small chomatalike septal bases present against the earlier whorl; aperture areal in the enrolled part, a small rounded terminal opening in the uncoiled chambers. M. Jurassic (Callovian) to U. Jurassic (Oxfordian); USSR: Uzbek SSR.

 

Remarks: Although stated to differ from Charentia in lacking the thickened chomatalike septal bases, these structures are clearly evident in published sections of P. kurgantchensis Kurbatov (1972, *1759, p1.6, figs. 11 and 12); as the illustrated sections of P. vandobensis were not cut in the axial plane, the apertural foramen is not evident and the septal bases cannot be distinguished. Praekaraisella differs from Charentia in having a rounded rather than slitlike aperture in the adult.