Hedbergella

Hedbergella Temporal range: Early - Late Cretaceous (Hauterivian - Maastrichtian)
Scientific classification
Clade:	SAR
Phylum:	Foraminifera
Class:	Globothalamea
Order:	Rotaliida
Family:	†Hedbergellidae
Subfamily:	†
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 , , and , 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 , 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.