Foraminifera taxon details
From editor or global species database
Diagnosis Test inequally biconvex with more elevated umbilical side, about three gradually enlarging whorls, chambers appear low and semicircular and sutures oblique and thickened on the spiral side, only the final whorl of about nine subtriangular chambers visible on the umbilical side, septal face oblique to the plane of coiling, a prominent stellate series of rhomboidal chamberlets surrounding the closed umbilicus results from subdivision of the primary chamber lumen by an internal toothplate that extends from the apertural face obliquely through the chamber to attach near the middle of the preceding septum and to the lateral chamber wall on the umbilical side, chamberlet communicating only with the remainder of the same chamber and not separately to the exterior, periphery carinate; wall calcareous, hyaline, optically radial, finely perforate, surface smooth, except in the region of the aperture, where numerous small inflational granules, grooves, and pustules cover the final portion of the preceding whorl just below the aperture on the umbilical side and commonly are aligned in the direction of growth; aperture a low interiomarginal slit, opening only into the primary chamber, and extending from the contact with the final supplementary chamber nearly to the peripheral keel, bordered above by a narrow lip, aperture of previous chambers serving as intercameral foramina. L. Eocene to Holocene; cosmopolitan. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]
From editor or global species database
| |