Theocotyle nigriniae

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


Citation: Theocotyle nigriniae Riedel and Sanfilippo 1970
Rank: species
Basionym: Theocotyle nigriniae
Notes & discussion: Riedel & Sanfilippo 1970; Sanfilippo and Riedel, 1982; Sanfilippo et al 1985

Catalog entries: Theocotyle cryptocephala nigriniae

Original description: Cephalis hemispherical, with small circular pores, bearing a conical horn of variable length. Thorax campanulate, almost as wide as the abdomen, with circular pores. Lumbar stricture distinct. Abdomen subcylindrical or slightly inflated, usually longer than thorax but commonly shorter in early specimens. Abdominal pores subcircular, as large to about twice as large as those of the thorax, commonly in longitudinal rows. Abdomen terminates in a thickened poreless rim which occasionally bears three or more short, pointed projections. Length (excluding horn) 110 to 205μ, maximum breadth 70 to 125μ. Remarks: This species was recorded as Theocorys sp. by Nigrini in her report on the radiolarians from Leg 2 of this expedition, and the specimens illustrated by her are considered to be more typical of the sub- species than those illustrated here. Therefore, we designate as holotype the specimen illustrated in her Plate 4, Figure 12.


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:


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 :: ::


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

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