Nannotax3 - ntax_mesozoic - Haqius ellipticus

Distinguishing features:
Parent taxon (Haqius): Unicyclic, elliptical and circular placolith coccoliths with a narrow or closed central area and a characteristically dark gray (low birefringence) XPL image.
This taxon: Large (7-15µm) elliptical Haquis species

Citation: Haqius ellipticus (Grün in Grün&Allemann, 1975) Bown, 1992 emend. Bown, 2005

Basionym: Markalius ellipticus Grün in Grün and Allemann, 1995

Large (>7.0 µm) unicyclic placolith with a narrow or closed central area. Under LM XPL the shields appear gray and the numerous individual elements are usually visible. The proximal shield is significantly smaller than the distal and is often clearly distinguishable.

Distinguished from the smaller species, Haqius peltatus, on size (>7.0 µm).

Geological Range:
Last occurrence (top): within Early Barremian Substage (124.40-126.50Ma, top in Barremian stage). Data source: Bown et al. 1998
First occurrence (base): within Late Tithonian Substage (143.10-145.00Ma, base in Tithonian stage). Data source: Bown et al. 1998

References:

Aguado, R. et al. (2018). A new record of the Weissert episode from the Valanginian succession of Cehegín (Subbetic, SE Spain): bio- and carbon isotope stratigraphy. Cretaceous Research. 92: 122-137. gs

Bown, P. R. (1992). New calcareous nannofossil taxa from the Jurassic/Cretaceous boundary interval of Sites 765 and 261, Argo Abyssal Plain. Proceedings of the Ocean Drilling Program, Scientific Results. 123: 369-379. gs

Bown, P. R. (2005c). Early to Mid-Cretaceous Calcareous Nannoplankton from the Northwest Pacific Ocean, Leg 198, Shatsky Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 198: 1-82. gs O

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O

Bralower, T. J., Monechi, S. & Thierstein, H. R. (1989). Calcareous nannofossil zonation of the Jurassic-Cretaceous boundary interval and correlation with the geomagnetic polarity timescale. Marine Micropaleontology. 14: 153-235. gs

de Kaenel, E. & Bergen, J. A. (1996b). Mesozoic calcareous nannofossil biostratigraphy from sites 897, 899, and 901, Iberia Abyssal Plain: New biostratigraphic evidence. Proceedings of the Ocean Drilling Program, Scientific Results. 149: 27-59. gs O

Grün, W. & Allemann, F. (1975). The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae. 68: 147-211. gs O

Haqius ellipticus

References:

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