Foraminifera taxon details
From editor or global species database
Diagnosis Test lenticular, biconvex, trochospirally coiled, all chambers visible on the spiral side, only the nine of the last whorl visible on the umbonate opposite side, periphery subacute, a median internal plate obliquely divides the chamber into halves, and an oblique bridge extends across the chamber from front to back near the ventral side from the inner margin of the median plate, the two partitions cutting off an umbilical cavity, a dorsal cavity, and a ventral one, the chamber subdivisions communicating through small openings above the partition near the dorsal wall; wall calcareous, aperture interiomarginal, double, primary opening situated midway between the umbilicus and periphery, a short flap or tenon separating it from the second nearly umbilical opening, each bordered by a thickened and radially grooved lip. M. Triassic (Anisian) to U. Triassic (Rhaetian); Austria; Italy; Yugoslavia; Bulgaria; Hungary; China. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]
From editor or global species database
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