References

Journal of Micropalaeontology

J. Micropalaeontol.

2041-4978

GSL Publishing

Göttingen, Germany

10.1144/jm.17.2.97

On the evolution of the Hedbergellidae from the Praehedbergellidae

Boudagher-Fadel

M. K.

⁰ Banner

F. T.

⁰ ³ Gorbachik

T. N.

¹ Simmons

M. D.

² Whittaker

J. E.

Postgraduate Micropalaeontology Unit, Department of Geological Sciences, University College London, Gower Street, London WC1E 6BT, UK

Department of Palaeontology, Geological Faculty, Moscow State University, Vorobiovy Gory, 119899 Moscow, Russia

Department of Geology & Petroleum Geology, University of Aberdeen, Aberdeen AB9 2UE, UK

Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK

01 12 1998

17 2 97 103

1998

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In order to establish the relationship between the smooth, microperforate praehedbergellid forms of the genus Blefuscuiana with the younger, macroperforate and muricate forms typical of Hedbergella, two similar taxa but with the different characters of the two genera, are studied here: Blefuscuiana praetrocoidea (Kretchmar & Gorbachik) and its descendant Hedbergella trocoidea (Gandolfi), the type species of Hedbergella, and which typifies the Hedbergellidae. B. praetrocoidea was only found in the Early Aptian in the North Tethys. H. trocoidea ranges from the Late Aptian to Early Albian (?M. Albian) and is a cosmopolitan species. It evolves into Ticinella roberti (Gandolfi), a Late Aptian–Albian species with fused portici. The evolution of the Praehedbergellidae into the Hedbergellidae appears to be related to a relative sea-level rise in the Late Aptian and Albian (and the opening of the Proto-Atlantic) which provided a number of deep-water niches which the Hedbergellidae occupied.

References 1

D., Altiner: Microfossil biostratigraphy (mainly foraminifers) of the Jurassic–Lower Cretaceous carbonate successions in north-western Anatolia (Turkey), Geologica Romana, 27, 167-213, 1991.

F. T., Banner and D., Desai: A review and revision of the Jurassic–Early Cretaceous Globigerinina, with especial reference to the Aptian assemblages of Speeton (North Yorkshire, England), Journal of Micropalaeontology, 7, 143-185, 1988.

J. P., Bellier and N., Chitta: Foraminiferes planctoniques et zonation de l’Aptien du Djèbel Goraa (Tunisie Séptentrionale), Cahiers de Micropaléontologie, 3, 37-48, 1981.

N., Ben Haj Ali: Etude biostratigraphique du Crétacé (Aptièn à Cénomanien) de la région de Teboursouk (Tunisie Septentrionale) sur la base des foraminifères planctoniques, Notes du Service Géologique de Tunisie, 54, 75-105, 1987.

H. M., Bolli: Planktonic foraminifera from the Cretaceous of Trinidad, B.W.I, Bulletin of American Paleontology, 39, 257-277, 1959.

M., BouDagher-Fadel, F. T., Banner, T. N., Gorbachik, M. D., Simmons and J. E., Whittaker: Evolution in the Early Cretaceous planktonic foraminiferal genus <italic>Blefuscuiana.</italic>, Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 202, 243-258, 1996.

T. J., Bralower, M. A., Arthur, R. M., Leckie, W. V., Sliter, D. J., Allard and S. O., Sclanger: Timing and palaeoceanography of oceanic dysoxia/anoxia in the Late Barremian to Early Aptian (Early Cretaceous), Palaios, 9, 335-369, 1994.

P., Brönnimann and N. K., Brown: <italic>Hedbergella</italic>, a new name for a Cretaceous planktonic foraminiferal genus, Journal of the Washington Academy of Sciences, 48, 15-17, 1958.

M., Caron: 4Cretaceous planktic foraminifera<italic>In</italic> (Eds) Plankton Stratigraphy, 17–86Cambridge University Press., 1985.

J. A., Cushman and R., Todd: A foraminiferal fauna from the New Almaden District, California, Contributions from the Cushman Laboratory for Foraminiferal Research, 24, 90-98, 1948.

E., Erba: Nannofossils and superplumes, the Early Aptian nannoconid crisis, Palaeoceanography, 9, 483-501, 1994.

R., Gandolfi: Ricerche micropaleontologiche e stratigrafiche sulla scaglia e sul flysch Cretacici dei Dintorni di Balerna (Canton Ticino), Rivista Italiana di Paleontologia, 48, 1-160, 1942.

T. N., Gorbachik: Jurassic and Early Cretaceous Planktonic Foraminifera of the South of the USSRAN SSSR, ‘Nauka’, Moscow, 239 pp[In Russian]., 1986.

B. U., Haq, J., Hardenbol and P. R., Vail: Mesozoic chronostratigraphy and cycles of sea-level change, Special Publications of the Society of Economic Paleontologists and Mineralogists, 42, 73-108, 1988.

K. J., Hsü: Tectonic evolution of the Mediterranean basins<italic>In</italic> (Eds) The Ocean Basins and Margins, 4APlenum, New York, 54–55., 1977.

J. F., Longoria: Stratigraphic, morphologic and taxonomic studies of Aptian planktonic foraminifera, Revista Española de Micropaleontologia, 5-107, 1974.

B. A., Masters: Mesozoic planktonic foraminifera<italic>In</italic> (Ed.) Oceanic Micropalaeontology, 1Academic Press, London, 301–731., 1977.

M., Moullade: Etude stratigraphique et micropaléontologique du Crétacé inférieur de la ‘Fosse Vocontienne’, Documents du Laboratoire de Géologie de la Faculté des Sciences de Lyon, 15, 1-369, 1966.

T., Neagu: Albian foraminifera of the Rumanian Plain, Micropaleontology, 11, 1-38, 1965.

H., Risch: Stratigraphie der hoheren Unterkreide der Bayerischen Kalkalpen mit Hilfe von Mikrofossilien, Palaeontographica, (A), 138, 1-180, 1971.

J., Salaj: Microbiostratigraphie du Crétacé et du Paléogène de la Tunisie Septentrionale et OrientaleInstitut Geologique de Dionyz Stùr, Bratislava., 1980.

J., Salaj: Foraminifers and detailed microbiostratigraphy of the boundary beds of the Lower Cretaceous stages in the Tunisian Atlas, Geologický Sbornik, 35, 583-599, 1984.

A. M., Shahin: Biostratigraphy of the subsurface Lower Cretaceous succession in the Bardawil area, northern Sinai, Egypt, Neues Jahrbuch für Geologie und Paläontologie, Monatshefte, 1993, 413-433, 1993.