Foraminifera source details
Nederbragt, A. J. (1991). Late Cretaceous Biostratigraphy and Development of Heterohelicidae (Planktic Foraminifera). Micropaleontology. 37(4): 329.
187786
10.2307/1485910 [view]
Nederbragt, A. J.
1991
Late Cretaceous Biostratigraphy and Development of Heterohelicidae (Planktic Foraminifera)
Micropaleontology
37(4): 329
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This paper presents a biostratigraphic and taxonomic analysis of late Cretaceous planktic foraminiferal Heterohelicidae from Tethyan and SW Atlantic sections. Albian and Cenomanian heterohelicids are small opportunists. Since the Turonian, an overall gradual increase in numeric importance and species richness can be observed, with iterative introduction of chamber proliferation. The early Turonian, mid Santonian and early Maastrichtian are periods of rapid speciation. Differences between localities are attributed to paleo-environmental conditions. A new genus, Laeviheterohelix, groups the smooth, microperforate heterohelicids. Four species and one subspecies are new: Heterohelix labellosa, Laeviheterohelix flabelliformis, Laeviheterohelix turgida, Pseudoguembelina hariaensis and sigalia deflaensis rugocostata.
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Heterohelix labellosa Nederbragt, 1991 † (original description)
Laeviheterohelix Nederbragt, 1991 † (original description)
Laeviheterohelix flabelliformis Nederbragt, 1991 † (original description)
Laeviheterohelix turgida Nederbragt, 1991 † (original description)
Pseudoguembelina hariaensis Nederbragt, 1991 † (original description)
Sigalia deflaensis (Sigal, 1952) † (new combination reference)
Sigalia deflaensis subsp. rugocostata Nederbragt, 1991 † accepted as Sigalia rugocostata Nederbragt, 1991 † (original description)
Laeviheterohelix Nederbragt, 1991 † (original description)
Laeviheterohelix flabelliformis Nederbragt, 1991 † (original description)
Laeviheterohelix turgida Nederbragt, 1991 † (original description)
Pseudoguembelina hariaensis Nederbragt, 1991 † (original description)
Sigalia deflaensis (Sigal, 1952) † (new combination reference)
Sigalia deflaensis subsp. rugocostata Nederbragt, 1991 † accepted as Sigalia rugocostata Nederbragt, 1991 † (original description)