Theocotyle venezuelensis


Classification: rads_cenozoic -> Theoperidae -> Theocotylidae -> Theocotyle -> Theocotyle venezuelensis
Sister taxa: T. conica, T. cryptocephala, T. nigriniae, T. venezuelensis, T. sp.,

Taxonomy

Citation: Theocotyle venezuelensis Riedel & Sanfilippo 1970
Rank: species
Basionym: Theocotyle venezuelensis
Notes & discussion: Riedel & Sanfilippo 1970 p.525 pl.6 fig.9-10;pl.7 fig.1-2;Sanfilippo&Riedel 1982; Sanfilippo et al. 1985 p.685-686 figs.25.4a-c

Catalog entries: Theocotyle venezuelensis

Original description: Cephalis subspherical, with few small pores, bearing a short conical horn. Collar and lumbar strictures distinct. Thorax hemispherical (tending to become conical in late specimens), with circular pores. Abdomen inflated, much wider than the mouth and the thorax, with large circular pores and terminating in a thickened rim. Surface of thorax and abdomen rough.

Length (excluding horn) 155 to 240µm, maximum breadth 125 to 210µm. Distinguishing characters (rw): This species is distinguished from late specimens of Theocotyle cryptocephala cryptocephala by its larger and more inflated abdomen, and from Theocotyle (?) ficus by its larger abdominal pores, generally thinner wall, and usually hemispherical thorax. However, some late specimens with relatively small, almost conical thorax might be confused with Theocotyle (?) ficus; later specimens are considerably larger than earlier ones, with the thorax relatively smaller.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

Plot of occurrence data:

References:

Riedel, W. R. & Sanfilippo, A. (1970). Radiolaria, Leg. 4 DSDP. Initial Reports of the Deep Sea Drilling Project. 4: 503-575. gs :: ::

Sanfilippo, A. & Riedel, W. R. (1982). Revision of the radiolarian genera Theocotyle, Theocotylissa and Thyrsocyrtis. Micropaleontology. 28(2): 170-188. gs :: ::

Sanfilippo, A., Westberg-Smith, M. J. & Riedel, W. R. (1985). Cenozoic Radiolaria. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 631-712. gs :: ::


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Theocotyle venezuelensis compiled by the radiolaria@mikrotax project team viewed: 6-7-2020

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