Family SCHUBERTELLIDAE Skinner, 1931

Schubertellidae A. D. Miklukho-Maklay, Rauzer Chernousova, and Rozovskaya, 1958 (*2132), p. 17,nom..transl. ex subfamily Schubertellinae. Boultonidae Toriyama, 1960 (*3212), p. 36 (nom. imperf.,recte Boultoniidae).

Test fusiform to subcylindrical, advanced taxa may be uncoiled and rectilinear or flar­ing in later stage; early coiling streptospiral or with sharp change in direction from early whorls to later ones; early septa flat, fluted in advanced taxa; wall varied, with tectum and upper and lower tectoria, tectum, and diaphanotheca, tectum and lower tectorium only, a single thin layer, or with tectum and alveo­lar keriotheca; tunnel single, chomata low to large and asymmetrical. U. Carboniferous (Moscovian) to U. Permian.