CHARENTIA Neumann, 1965

 

 

Type species: Charentia cuyillieri Neumann, 1965 (syn. = Hemicyclammina praesigali Banner, 1966, *120, p. 216); OD.

Charentia Neumann. 1965 (*2245), p. 93.

Tonasia Gorbachik. 1968 (*1268), p. 7; type species: Tonasia evolute Gorbachik. 1968; OD.

Test free, early stage planispirally enrolled. biumbonate and lenticular to subglobular, with a tendency to uncoil in the last one or two chambers, rarely as many as four, laterally compressed and rectilinear, periphery sub-acute to rounded: wall finely agglutinated, solid in the early stage, later with wall pierced by cylindrical canaliculi that do not reach completely to either the inner or outer wall surface but give a pseudoalveolar or almost keriothecal structure, apertural face solid and noncanaliculate, the portion just beneath the aperture and against the previous whorl being distinctly thickened, in thin section appearing as small triangular projections from the spiral septum that superficially resemble fusulinacean chomata; aperture areal, an arch near the base of the face in the early stage, later becom­ing triangular, the upper angle of the triangle gradually lengthening to become a narrow slit up the apertural face, and becoming a terminal slit in the uncoiled chambers. Cretaceous (U. Barremian to Cenomanian); France; Spain: USSR: E. Crimea; Egypt; USA: Texas.

 

Remarks: The pseudoalveolar nature of the wall of Charentia first was reported by Hottinger (1967, *1546, p. 33) as radially striate and keriothecalike; it was further discussed by Loeblich and Tappan (1985, *1923, p. 96), and both wall structure and the ontogenetic changes in the aperture were demonstrated.