Biwaellinae Davydov 1984

Subfamily BIWAELLINAE Davydov, 1984 Test shortly fusiform, often asymmetrical. Early stage discoidal; later stage more or less fusiform with acute poles. Septa numerous, unfluted in the center but slightly fluted at the poles, especially in the outer whorls. Chomata low, asymmetrical and bordering a broad and low tunnel. Wall bilayered with a tectum and an inner porous layer. Aperture terminal simple. Composition: Biwaella Morikawa & Isomi, 1960; Douglassites Read & Nestell, 2018; Dutkevichites Davydov, 1984; Oketaella Thompson, 1951.