Catalog - Dentigloborotalia

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Dentigloborotalia

Citation: Dentigloborotalia Brummer 1988

Type species: Globorotalia anfracta Parker 1967

Proloculus spherical, except for flat wall shared with deuteroconch: aperture excentrical relative to proloculus-deuteroconch axis; wall secondarily calcified, non-spinose, pustulate, imperforate .
Juvenile stage planispiral after abrupt 90° shift in coiling direction at proloculus-juvenile stage boundary, third and subsequent chambers coiled around proloculus-deuteroconch complex, proloculus on umbilical side; umbilicus open; aperture of deuteroconch opposite proloculus deuteroconch suture, subsequently equatorial with umbilical flange curving inward to spiral side; wall non-spinose, pustulate, finely macroperforate: pustules shark tooth-like, pointing away from aperture; pores non-sutural, irregularly distributed.
Neanic stage trochospiral; umbilicus closing producing pseudo-umbilicus; aperture migrating to umbilical-extra~mbilical position, inward-curved part of flange reduced; chamber wall peripherally perforate; otherwise as juvenile
Adult stage with rounded axial chamber periphery; otherwise as late neanic stage.
Terminal stage as adult.

From the Latin dens, gen. dentis tooth, and the generic name Globorotalia, referring to the denticulate globorotaliid morphology.

Remarks Dentigloborotalia is assigned to the Globorotaliinae because of its non-spinose, pustulate, finely macroperforate and non-cancellate wall microstructure, the late neanic/terminal umbilical-extraumbilical aperture with flange, and the slightly angular profile of the late neanic stage. It differs from other globorotaline taxa in the abrupt 90° shift in coiling direction at the prolocular-juvenile transition, the juvenile planispiral coiling around the proloculus-deuteroconch complex, the juvenile equatorial aperture with umbilically protruding and spirally inward-curved flange, and the minute, bilaterally symmetrical, shark teeth-shaped pustules that are pointed away from the aperture throughout ontogeny .

References:

Brummer, G. J. A. (1988b). Comparative ontogeny and species definition of planktonic foraminfers: A case study of Dentigloborotalia anfracta n. gen. In, Brummer, G. J. A. & Kroon, D. (eds) Planktonic Foraminifers as Tracers of Ocean-Climate History. Free University Press, Amsterdam 51-75. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Dentigloborotalia Brummer 1988

Dentigloborotalia

References:

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