dcsimg

Diagnosis

provided by World Register of Marine Species
Test free, circular in section, globular, but produced into a neck at one pole; wall calcareous, translucent, of two discrete layers, the inner wall layer imperf orate, with shagreenate surface, outer wall finely costate longitudinally, the fine costae bifurcating and anastomosing to maintain a nearly constant spacing, costae interconnected by narrow bars that leave small openings between them, a few much more elevated and flangelike costae present on the apertural neck, grading into the low costae at their base; base of the test with a ring of short blunt spines; aperture terminal, subtrigonal with short notches at the angles, at the end of the long neck that comprises about one-third the length of the test. U. Oligocene to Holocene; cosmopolitan. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification)

Reference

Loeblich, A. R.; Tappan, H. (1987). Foraminiferal Genera and their Classification. Van Nostrand Reinhold Company, New York. 970pp.

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contributor
Tomas Cedhagen [email]