PROFUSULINELLA Rauzer-Chernousova and Belyaev, 1936

 

 

Type species: Profusulinella pararhomboides Rauzer-Chernousova and Belyaev, in Rauzer-Chernousova et al., 1936; OD.Profusulinella Rauzer-Chernousova and Belyaev, in Rauzer-Chernousova et al., 1936 (*2529), p. 175, 220. Aljutovella Rauzer-Chemousova, in Rauzer-Chernousova et al., 1951 (*2532), p. 182; type species: Profusulinella aljutoyica Rauzer-Chernousova, 1938 (*2516), p. 97; OD.

Test small, up to about 1 mm in length, fusiform, globular proloculus followed by closely coiled early whorls, rapidly becoming elongate after a sharp change in coiling axis, septa plane and not fluted; wall with three layers, tectum, diaphanotheca, and upper tectorium, with lower tectorium in a few chambers of some advanced species, chomata prom­inent, asymmetrical, secondary thickening extending laterally toward the poles. U. Car­boniferous (Moscovian); USA: Texas; Peru; China; Japan; USSR.

 

Remarks: The profusulinellid wall was originally described as having a tectum and inner and outer tectoria, but the wall of Profusulinella was restudied by Skinner and Wilde (1954, *2994, p. 446) and shown to have a primary tectum and diaphanotheca with an outer tectorium and a lower tectorium only rarely in a few chambers.