FUSULINANA Maslakova, 1990

Vachard, Daniel & Le Coze, Francois, 2024, Paleozoic Foraminifera: Current State Of The Classification And Perspectives, Acta Palaeontologica Romaniae 20 (2), pp. 97-130 : 105

Subclass FUSULINANA Maslakova, 1990

Tests nautiloid, lenticular, discoid, subquadratic, inflated fusiform, elongate fusiform, subrhombic, subcylindrical. Proloculus spherical, small to large, and reniform or rectangular. Juvenaria often present. Endothyroidally or planispirally coiled tests, rarely uncoiled. Chambers globular and not numerous (endothyrids), to quadratic to fusiform and numerous (fusulinids). Septa planar to moderately folded to strongly folded. Endoskeleton always developed (crusts, hooks, pseudochomata, chomata). Wall dark microgranular occasionally bilayered to multilayered (globoendothyrids, ozawainelloids) often with a dark-microgranular thin tectum, and a differentiated inner layer (schubertelloids with primatheca; fusulinoids with diaphanotheca; schwagerinoids with keriotheca; neoschwagerinoids with “fine keriotheca”). Aperture terminal simple, basal, rarely cribrate, occasionally reduced to septal pores, cuniculi or

Septa planar. Endoskeleton generally developed (crusts,

hooks, pseudochomata). Wall dark microgranular, occasionally bilayered to multilayered. Aperture terminal simple, basal, rarely cribrate or central.