DREVENNIA Arnaud-Vanneau, 1980

 

 

Type species: Drevennia ecougensis Arnaud-Vanneau, 1980; OD.Drevennia Arnaud-Vanneau, 1980 (*71), p. 569.

Test free, elongate, over 1.2 mm in length, early stage conical and trochospiral, later uncoiled and subcylindrical, chambers low and discoidal, uniserial and rectilinear, septa thick and horizontal, in the rectilinear part leaving a central region of about one-third the test diameter that is filled with short thick pillars, fusing to form a central columellar mass; wall microgranular, calcareous, with some agglutinated particles; aperture cribrate, consisting of pores in the oval to subcircular apertural face, earlier ones, seen in section, may pierce the central columella as well as the septa. L. Cretaceous (U. Barremian to Bedoulian); France.

 

Remarks: Dreyennia resembles Satorina in the trochospiral stage followed by an uncoiled rectilinear one, but the axial region is less well developed.