Family OZAWAINELLIDAE Thompson and Foster, 1937
Ozawainellidae A. D. Miklukho-Maklay, 1958 (*2124), p. 13, nom. transl. ex subfamily Ozawainellinae.
Pseudoendothyridae Mamet and Skipp, 1970 (*2015), p. 1137, 1140 (name not available, ICZN Art. 13 (a)(i), no description).Pseudoendothyridae Mamet, in Mamet, Mikhailoff, and Mortelmans, 1970 (*2013), p. 36.
Eostaffellidae Mamet, in Mamet, Mikhailoff, and Mortelmans, 1970 (*2013), p. 33.
Test discoidal, spherical, or ovoid, geologically early taxa planispiral and evolute, later ones involute to irregularly coiled, axis of coiling short to elongate; wall or spirotheca of early forms with tectum, upper and lower tectoria, later ones with diaphanotheca between tectum and lower tectorium, single tunnel, chomata indistinct to massive. L. Carboniferous (Visean) to U. Permian (Murgabian).