Foraminifera taxon details
From editor or global species database
Description Test free, biserially coiled to biseriate. A few whorls and a few chambers increase rapidly in height. An oral valvula is located near the aperture. Supplementary deposits absent or very rare. Supplementary chamberlets occasionally present. Wall unilayered dark microgranular or granular with calcareous agglutinate, or bilayered with an inner pseudofibrous layer. Aperture simple basal.
Range and distribution: Latest Viséan (MFZ15)-latest Permian (Changhsingian); cosmopolitan, common in the Tethyan and Uralian oceans. Earliest Triassic of South China.
(Vachard in Vachard and Krainer (2022), p. 34). [details]
Diagnosis Test free, subglobular to flattened perpendicular to the broad apertural face, chambers biserially arranged, with axis of biseriality enrolled in a planispiral to slightly trochoid manner; wall calcareous, microgranular, may have an inner fibrous or radial layer that is best developed along the septa; aperture interiomarginal, against the preceding chamber, and partially covered by a valvular projection near the center of the edge of the apertural face that overlaps the preceding aperture. M. Carboniferous to U. Permian (U. Djulfian); cosmopolitan. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]
From editor or global species database
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