CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia anfracta Parker 1967
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Original Description Test small, early part flattened on the evolute side, later chambers becoming increasingly convex, periphery rounded ; chambers subquadrate, inflated, increasingly so as added, 4-5½ in the final whorl, up to 13 in all, usually 10-11 in all; sutures narrow, depressed, curving; wall thin, smooth, translucent, finely perforate; aperture highly arched, often extending up onto the periphery, with a relatively broad lip. Size: Diameter up to about 0.25 mm, usually smaller. Extra details from original publication Remarks:G. anfracta differs from G. scitula in the more broadly rounded periphery, more highly arched aperture, dorsally inflated later chambers, lack of ornamentation by secondary spines, and smaller size. This species is described from a Recent sample in which it is much more common than in the fossil core material. It is common also in plankton samples from the Gulf of California. The ancestry is not known, probably because of the elimination of many small species from the cores by solution of calcium carbonate. G. anfracta first occurs in the cores near the base of Zone N.21, but may be found lower in the section at some later time.
References:
Parker, F. L. (1967). Parker, F. L. (1967). Late Tertiary biostratigraphy (planktonic foraminifera) of tropical Indo-Pacific deep-sea cores. Bulletins of American Paleontology. 52(235): 115203-. Bulletins of American Paleontology. 52(235): 115203-. gs
Globorotalia anfracta compiled by the pforams@mikrotax project teamviewed: 14-6-2025
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