Archaias Montfort 1808

Test compressed, periphery rounded, early stage planispiral and involute, with a thickened central boss, chambers numerous, low and widening rapidly, equitant on the periphery, sutures strongly oblique and curved, later whorls flaring, peneropline, flabelliform or discoid, and chambers cyclical and evolute, interior of all but earliest chambers with cylindrical interseptal pillars, but no internal partitions or septula; wall calcareous, porcelaneous, early chambers perforate, later with surface pits or pseudopores; aperture in the early stage a basal slit, in the adult two to four rows of pores on the truncate apertural face are interspersed between the internal pillars, occupying much or all of the test circumference. Miocene to Holocene; cosmopolitan. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification)