Hedbergella

Hedbergella Temporal range: Early - Late Cretaceous (Hauterivian - Maastrichtian)
Scientific classification
Clade:	SAR
Phylum:	Foraminifera
Class:	Globothalamea
Order:	Rotaliida
Family:	†Hedbergellidae
Subfamily:	†Hedbergellinae
Genus:	†Hedbergella Brönnimann and Brown, 1958
Species
See text

Hedbergella is an extinct genus of planktonic foraminifera from the Cretaceous, described by Loeblich and Tappan, 1961, as:

Test free, trochospiral, biconvex, umbilicate, periphery rounded with no indication of keel or poreless margin; chambers globular to ovate; sutures depressed, radial, straight or curved; wall calcareous, finely perforate, radial in structure, surface smooth to hispid or rugose; aperture an interiomarginal, extraumbilical-umbilical arch commonly bordered above by a narrow lip or spatulate flap, ... Includes species otherwise similar to Praeglobotruncana but which lack a keel or poreless margin, hence is regarded as a separate genus rather than as a subgenus of Praeglobotruncana as by Banner and Blow (1959).

Hedbergella was named by Brönnimann and Brown in 1958, and is included in the family Hedbergellidae and the suborder Globigerinina.^[1] Hedbergella ranges through most of the Cretaceous, from the Hauterivian to the Maastrichtian at the end.

Related genera

Genera possibly related closely to Hedbergella are Asterohedbergella, Costellagerina, and Whiteinella, which are included with Hedbergella in the Hedbergellinae, but which have shorter ranges.

Asterohedbergella, which has a stellate outline, is from the Upper Cretaceous (M. to U. Cenomanian) of Israel. Costellagerina, which has a lobate outline, is from the Upper Cretaceous (Cenomanian to Campanian) and is cosmopolitan. Whiteinella, which has a pustulate surface, is from the U. Cretaceous (M. Cenomanian to M. Turonian), and is also cosmopolitan.

The species Muricohedbergella delrioensis, originally described as Globigerina cretacea var. delrioensis, was formerly accepted as Hedbergella delrioensis.^[2]

Species

Species in Hedbergella include:^[1]

References

• A.R. Loeblich Jr.; Helen Tappan (1961). "Cretaceous planktonic foraminifera: Part 1: Cenomanian". Micropaleontology. 7 (3, July 1961). doi:10.2307/1484364. JSTOR 1484364.
• A.R. Loeblich Jr.; Helen Tappan (1988). "Hedbergellidae". Forminiferal Genera and their Classification. Archived from the original on 2012-06-16.

Further reading

• Reolid, M.; Sanchez-Quinonez, C.A.; Molina, E.; Alegret, L. (1 January 2015). "Palaeoenvironmental turnover across the Cenomanian-Turonian transition in Oued Bahloul, Tunisia: foraminifera and geochemical proxies". Palaeogeography, Palaeoclimatology, Palaeoecology. 417: 491–510. Bibcode:2015PPP...417..491R. doi:10.1016/j.palaeo.2014.10.011.