Praeglobotruncana

Loeblichella
Temporal range: Early Cretaceous - Late Cretaceous
(Albian - Turonian)
Scientific classification
Domain: Eukaryota
(unranked): SAR
(unranked): Rhizaria
Superphylum: Retaria
Phylum: Foraminifera
Class: Globigerinida
Order: Globigerinina
Superfamily: Rotaliporoidea
Family: Hedbergellidae
Genus: Praeglobotruncata
Bermúdez, 1952

Praeglobotruncata[1] is a genus of globigerid forams belonging to the family Hedbergellidae of the superfamily Rotaliporoidea and the suborder Globigerinina,[2] which belongs to the order Globigerinida[3] Its type species is Praeglobotruncana hessi.

The genus name is after the early form of the truncated globules.

Its fossil range is during the Late Cretaceous Period.

Description

Praeglobotruncata includes species with spiral truncated cones, in a bi-convex and spiral convex form, its chambers were ovular and sub-rhombiodal, trapezoidal and spiral like, its inter-chamber sutures were straight and incised on the umbilical side with curves. Its opening were inter-marginal, umbilical, extra-umbilical, in a lower arc form and protected by a front opening. It had a calcitic wall, macroperfocated with low or high density pores, on all of the first chains.[1][4][5][6][7][8]

Paleoecology

Loeblichella includes species with a mode of planktonic life, of latitudinal distribution, in tropical and temperate waters, and pelagic numbers of superficial and intermediate waters (mesopelagic, lower to upper bathypelagic. in or under the thermocline).[2][8][9][10]

Species

Species in Praeglobotruncata include:[11][7][12]

  • Praeglobotruncana aeta
  • Praeglobotruncana algeriana
  • Praeglobotruncana aumalensis
  • Praeglobotruncana barbui
  • Praeglobotruncana caryi
  • Praeglobotruncana coarctata
  • Praeglobotruncana coarctata
  • Praeglobotruncana compressa
  • Praeglobotruncana delrioensis
  • Praeglobotruncana ecuadorensis, generic position unknown
  • Praeglobotruncana fusani
  • Praeglobotruncana gautierensis
  • Praeglobotruncana gibba
  • Praeglobotruncana gigantea
  • Praeglobotruncana hagni
  • Praeglobotruncana hansbollii
  • Praeglobotruncana helvetica
  • Praeglobotruncana hessi
    • Praeglobotruncana hessi compressiformis
  • Praeglobotruncana hilalensis
  • Praeglobotruncana imbricata
  • Praeglobotruncana inermis
  • Praeglobotruncana inornata
  • Praeglobotruncana irrasa, generic position unknown
  • Praeglobotruncana klausi
  • Praeglobotruncana lehmanni
  • Praeglobotruncana loeblichae
  • Praeglobotruncana mattsoni
  • Praeglobotruncana pauliani
  • Praeglobotruncana prachelvetica
  • Praeglobotruncana prahovae
  • Praeglobotruncana primitiva
  • Praeglobotruncana renzi
    • Praeglobotruncana renzi primitiva
  • Praeglobotruncana roddai
  • Praeglobotruncana seymourensis, generic position unknown
  • Praeglobotruncana shirakinensis
  • Praeglobotruncana socorroensis, generic position unknown
  • Praeglobotruncana sogdiana
  • Praeglobotruncana stephani
    • Praeglobotruncana stephani gibba
    • Praeglobotruncana stephani turbinata
  • Praeglobotruncana trocoidea
  • Praeglobotruncana wordeni, generic position unknown

Several subgenera has been classified in different genera:

  • Praeglobotruncana (Clavihedbergella), accepted under the genus Clavihedbergella
  • Praeglobotruncana (Dicarinella), accepted under the genus Dicarinella
  • Praeglobotruncana (Falsomarginotruncana), accepted under the genus Falsomarginotruncana
  • Praeglobotruncana (Hedbergella), accepted under the genus Hedbergella

References

  1. 1 2 Bermúdez, P.J. (1952). Estudio sistemático de los foraminíferos rotaliformes. Boletín de Geología, Venezuela, 2(4): 230 p.
  2. 1 2 Loeblich, A.R., Jr, Tappan, H. (1987). Foraminiferal general and their clasification. Van Nostrand Reinhold Company (ed.), 2 vol., 1-970, 1-212 + 847 laminated.
  3. ↑ Loeblich, A.R., Jr., Tappan, H. (1992). Present Status of Foraminiferal Classification. Studies in Benthic Foraminifera en Benthos'90, Sendai (1990), Tokai University Press, 93-102.
  4. ↑ Saltar a: a b Korchagin, O.A. (2003). Classification of the Mesozoic planktonic foraminifers (Superfamilies Planomalinacea, Rotaliporacea, and Globotruncanacea). GEOS, Moscow, 89 pp
  5. ↑ Loeblich, A. R., Jr., Tappan, H. (1964). Sarcodina, chiefly "Thecamoebians" and Foraminiferida; En: Moore, R.C. (ed.), Treatise on invertebrate paleontology: Protista 2, part C, 1: C1-C510, 2: C511-C900.
  6. ↑ Banner, F.T. (1982). A classification and introduction to the Globigerinacea. En: Banner, F.T. y Lord, A.R. (eds.), Aspects of Micropalaeontology, George Alien & Unwin, London, 141-239.
  7. 1 2 Caron, M. (1985). Cretaceous planktic foraminifera. En: Bolli, H.M., Saunders, J.B., Perch-Nielsen, K. (Eds.), Plankton Stratigraphy, Cambridge University Press, 17-86.
  8. 1 2 BouDagher-Fadel, M.K. (2012). Biostratigraphic and geological significance of planktonic foraminifera. Office of the Vice Provost Research (OVPR), University College, London, 287 p.
  9. ↑ Korchagin, O.A. (2004). On events of the Terminal Cenomanian in the eastern Central Asia. Russian Journal of Earth Sciences, Vol. 6(4): 1-23.
  10. ↑ Gebhardt, H., Friedrich, O., Schenk, B., Fox, L., Hart, M., Wagreich, M. (2010). Paleoceanographic changes at the northern Tethyan margin during the Cenomanian–Turonian Oceanic Anoxic Event (OAE-2). Marine Micropaleontology, 77: 25–45.
  11. ↑ Classifications Browser
  12. ↑ Smith, Ch., Pessagno, E.A.Jr (1973). Planktonic foraminifera and stratigraphy of the Corsicana Formation (Maastrichtian) North Central Texas. Cushman Foundation for Foraminiferal Research, Special Publication, no. 12, 68 pages.
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