Orthopithonella geometrica


Classification: non_cocco -> Dinophytes -> Thoracosphaeraceae -> Radial wall -> Orthopithonella -> Orthopithonella geometrica
Sister taxa: O. aequilamellata, O. aspera, O. collaris, O. compsa, O. congruens, O. duplicata, O. geometrica, O. globosa, O. gustafsonii, O. minuta, O. misurinae, O. multipora, O. ornata, O. porata, O. porifera, O. pycnothecata, O. reticulata, O. sp., O. veeversii, O. weileri,

Taxonomy:

Citation: Orthopithonella? geometrica (Jafar 1983) Janofske 1987
Rank: species
Basionym: Prinsiosphaera geometrica Jafar 1983
Synonyms:

Catalog entries: Prinsiosphaera geometrica * , Archaeopontosphaera primitiva *


Morphology remarks:
Archeopyle: present but type unclear (Streng et al. 2004)

Size: 3-9 µm (Bralower et al. 1991)

Geological Range:
Last occurrence (top): within NT2b subzone (201.10-218.91Ma, top in Hettangian stage). Data source: Bown 1998
First occurrence (base): within NT2a subzone (218.91-222.89Ma, base in Norian stage). Data source: Bown 1998

References:

Bown, P. R. (1987a). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 1-118. gs

Bown, P. R. (1998b). Triassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 29-33. gs

Bralower, T. J., Bown, P. R. & Siesser, W. (1991). Significance of Upper Triassic nannofossils from the Southern Hemisphere (ODP Leg 122, Wombat Plateau, NW Australia). Marine Micropaleontology. 17: 119-154. gs

Jafar, A. S. (1983). Significance of Late Triassic calcareous nannoplankton from Austria and Southern Germany. Neues Jahrbuch für Geologie und Paläontologie Abhandlungen. 166: 218-259. gs

Janofske, D. (1987). Kalkige Nannofossilien aus der Ober-Trias (Rhät) der Nördlichen Kalkalpen. Berliner Geowissenschaftlichen Abhandlungen A. 86: 45-67. gs

Moshkovitz, S. (1982). On the findings of a new calcareous nannofossil (Conusphaera zlambachensis) and other calcareous organisms in the Upper Triassic sediments of Austria. Eclogae Geologicae Helvetiae. 75: 611-619. gs


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Orthopithonella geometrica compiled by Jeremy R. Young viewed: 30-3-2020

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