Hedbergella
| Hedbergella | |
|---|---|
| Scientific classification Edit this classification | |
| Domain: | Eukaryota |
| Clade: | Diaphoretickes |
| Clade: | SAR |
| Phylum: | Retaria |
| Subphylum: | 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
[edit ]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
[edit ]Species in Hedbergella include:[1]
- Hedbergella accurata
- Hedbergella angularica
- Hedbergella aptiana
- Hedbergella compacta
- Hedbergella costatus
- Hedbergella excelsa
- Hedbergella gorbachickae
- Hedbergella hagni
- Hedbergella handousi
- Hedbergella hexacamerata
- Hedbergella hiltermanni
- Hedbergella hispaniae
- Hedbergella infracretacea
- Hedbergella kuhryi
- Hedbergella kuznetsovae
- Hedbergella labocaensis
- Hedbergella laculata
- Hedbergella luterbacheri
- Hedbergella madagascarensis
- Hedbergella maslakovae
- Hedbergella mitra
- Hedbergella modesta
- Hedbergella murphyi
- Hedbergella occulta
- Hedbergella porkulecensis
- Hedbergella praelippa
- Hedbergella praetrocoidea
- Hedbergella primare
- Hedbergella pseudoplanispiralis
- Hedbergella quadrata
- Hedbergella quadricamerata
- Hedbergella ranzenbergensis
- Hedbergella retroflexa
- Hedbergella roblesae
- Hedbergella ruka
- Hedbergella semielongata
- Hedbergella sigali
- Hedbergella similis
- Hedbergella speetonensis
- Hedbergella tardita
- Hedbergella tatianae
- Hedbergella telatynensis
- Hedbergella tissaloensis
- Hedbergella trocoidea
- Hedbergella tunisiensis
- Hedbergella tuschepsensis
- Hedbergella velata
- Hedbergella ventriosa
- Hedbergella yezoana
References
[edit ]- ^ a b "Hedbergella". World Foraminifera Database. Retrieved 27 November 2018.
- ^ "Muricohedbergella delrioensis". World Foraminifera Database. Retrieved 27 November 2018.
- 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年06月16日.
Further reading
[edit ]- 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年10月01日1.