Foraminifera taxon details
From editor or global species database
Diagnosis Test enrolled, appearing planispiral but slightly asymmetrical, bievolute, about eight or nine chambers in the final whorl, enlarging gradually as added, the final one or two may tend to uncoil, sutures arched, limbate, and elevated, periphery bicarinate, one keel at the periphery and the other paralleling it a short distance to one side; wall calcareous, perforate, with non perforate keels and sutures, surface variously ornamented, commonly beginning as ridges around the pores in a distinct reticulum, later with part of the reticulum becoming more prominent as pustules or straight to sinuate ridges, nearly obscuring the intervening pores; primary aperture a low arch at the base of the apertural face, bordered by a lip, secondary peripheral opening lies between the two keels and may be elevated on a necklike extension, bordered by an imperforate rim. Oligocene to Miocene; France; Netherlands; Germany; Hungary. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]
From editor or global species database
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