Hedbergella

Hedbergella
Temporal range: Early - Late Cretaceous (Hauterivian - Maastrichtian)
Scientific classification
Domain: Eukaryota
(unranked): SAR
(unranked): Rhizaria
Superphylum: Retaria
Phylum: Foraminifera
Order: Globigerinida
Superfamily: Rotaliporacea
Family: Hedbergellidae
Genus: Hedbergella
Brönnimann and Brown, 1958
species

see text

Hedbergella is a 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, 1958, and is included in the Rotaliporacea according to Loeblich and Tappan (1988), which is the Rotaliporidae of Loeblich and Tappan (1961) and the Treatise Part C, on Protista 2.

Hedbergella ranges through most of the Cretaceous, from the Hauterivian to the Maastrichtian at the end.

Among species included are those originally named Globigerina cretacea by d'Orbigny.

Globigerina cretacea

Globigerina cretacea was originally named by d'Orbigny for trochoidal foraminifera with globular chambers found in Cretaceous marine sediments in the Paris Basin of France. Specimens found subsequently in other locations in Europe and the United States, especially in Texas, were assigned to the same species, although differences in size were apparent. Assignment to the genus Globigerina was based on the globular to ovate chambers and trochoidal coiling, however true Globigerina is limited to the Cenozoic. Globigeninoid (look like Globigerina) forms from the Cretaceous differ in the placement of the aperture and nature of secondary apertures.

Three species of Hedbergella were, on separate occasions, originally named Globigerina cretacea: Hedbergella amabliis Loeblich and Tappan, 1961 and Hedbergella brittonensis Loeblich and Tappan, 1961, both holotypes from the Britton Clay, Eagleford Group, in Dallas County, Texas, and H. delrioensis, originally Globigerina cretacea var delrioensis Carsey, 1926, topotypes from within Austin, Travis County, Texas.

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), is also cosmopolitan.

Species

Sources:[1][2][3]

  • Hedbergella accurata †
  • Hedbergella amabilis †
  • Hedbergella angolae †
  • Hedbergella aptiana †
  • Hedbergella aptica †
  • Hedbergella archaeocretacea †
  • Hedbergella articulata †
  • Hedbergella astrepta †
  • Hedbergella atlantica †
  • Hedbergella aubertae †
  • Hedbergella beegumensis †
  • Hedbergella bizonae †
  • Hedbergella blakensis †
  • Hedbergella bornholmensis †
  • Hedbergella brittonensis †
  • Hedbergella caspia †
    • Hedbergella caspia turcmensis †
  • Hedbergella costellata †
  • Hedbergella delrioensis †
  • Hedbergella dessauvagiei †
  • Hedbergella eugubina †, accepted as Parvularugoglobigerina eugubina
  • Hedbergella externa †
  • Hedbergella flandrini †
  • Hedbergella gorbachickae †
  • Hedbergella hagni †
  • Hedbergella hillebrandti †
  • Hedbergella hiltermanni †
  • Hedbergella hoelzli †
  • Hedbergella holmdelensis †
  • Hedbergella implicata †
  • Hedbergella incauta †
  • Hedbergella infracretacea †
  • Hedbergella intermedia †
  • Hedbergella kyphoma †
  • Hedbergella lata †
  • Hedbergella libyca †
  • Hedbergella madagascarensis †
  • Hedbergella maslakovae †
  • Hedbergella monmouthensis †
  • Hedbergella murphyi †
  • Hedbergella occulta †
  • Hedbergella paradubia †
  • Hedbergella plana †
  • Hedbergella planispira †
  • Hedbergella porkulecensis †
  • Hedbergella portsdownensis †
  • Hedbergella praehelvetica †
  • Hedbergella praeincauta †
  • Hedbergella praelibyca †
  • Hedbergella praetrocoidea †
  • Hedbergella pseudotrocoidea †
  • Hedbergella punctata † - its generic position is uncertain
  • Hedbergella quadrata †
  • Hedbergella retroflexa †
  • Hedbergella rhinoceros †
  • Hedbergella rischi †
  • Hedbergella sigali †
  • Hedbergella similis †
  • Hedbergella simplex †
  • Hedbergella simplicissima †
  • Hedbergella sliteri †
  • Hedbergella sugali †
  • Hedbergella sundaypettersi †
  • Hedbergella telatynensis †
  • Hedbergella trocoidea †
    • Hedbergella trocoidea yezoana †
  • Hedbergella vesata †
  • Hedbergella volhynica †
  • Hedbergella washitensis †
  • Hedbergella wondersi †
  • Hedbergella yezoana †

References

  1. ↑ Encyclopedia of the Life
  2. ↑ World Modern Foraminifera Database
  3. ↑ Browser Classifications at UBIO, pg. 1-134

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. doi:10.1016/j.palaeo.2014.10.011. Retrieved 13 April 2015.

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