Discorboidea

Discorboidea, or Discorbacea in older taxonomies, is a superfamily of foraminifera, (testate protists), with a range extending from the Middle Triassic to the present, characterized by chambers arranged in a low trochospiral; an umbilical or interiomarginal aperture, with or without supplementary apertures; and a wall structure that is optically radial.

Eight families are currently recognized, further characterized here in. Discorbidae – Discorboidea in which each chamber is partly divided by an imperforate wall and the umbilical area is partly covered by chamber extensions. Discorbis, Neoeponides Bagginidae – Discorboidea with an overall finely perforate test, but imperforate in a part of ventral side Baggina, Cancris Eponididae – in which the aperture is interiomarginal and slit-like (or a narrow arch) or areal and cribrate. Eponides, Joanella, Paumotua, Poroeponides Heleninidae – in which the primary aperture is interiomarginal and secondary apertures are sutural Helenina Misissippinidae – have distinct, translucent or opaque bands near the periphery on one or both sides; Mississippina, Stomatorbina Pegidiidae – in which coiling is a modified trochospiral, with resorbed early chambers and apertures are open ends of tubes on the ventral side Pegidia Rotalinidae – have simple chamber interiors, an umbilicus partly covered by chamber extensions or closed, and an aperture that is a low interiomarginal arch. Gavellinopsis, Nevconorbina, Rosalina Sphaeroidinidae – Discorboidea with strongly overlapping chambers, arranged trochospirally or in different planes; and single slit-like or multiple apertures. Sphaeroidina