Description of Robertinidae
provided by BioPedia
Robertinine foraminifera, test nearly planispiral to trochospiral, usually dextral, chambers divided by double transverse partition resulting from infolding of wall, and forming small supplementary chambers on one or both sides of the test; aperture usually two slitlike openings, one interiomarginal at the base of the chamber, the other extending up the centre of the apertural face or areal; may have small supplementary openings on the spiral side.
