Theopilium tricostatum

Classification: rads_cenozoic -> hidden -> Mesozoic rads -> deleted -> Theopilium tricostatum
Sister taxa: A. leptoderma, A. undulatum, Clathrocorona, Clathromitridae, Euscenarium, Helotholus, Lamprocylcas, L. parabolica, Pyloniidae inc sed, R. oraculibrachium, S. sp. cf. elliptica, T. tricostatum, Tripophaenoscenium, Unknown, Myelastridae, Archiphormididae, Cenozoic uncertain, H. sp., T. sp., T. sp.


Citation: Theopilium tricostatum Haeckel 1887
Basionym: Theopilium tricostatum
Taxonomic discussion: Haeckel, 1887, p.1322, pl.70, fig.6; Hull, 1993 (ODP 136 SR), p 11-12 pl 4 fig 5; pl 6 fig 12

Catalog entries: Theopilium tricostatum

Original description: Shell flatly conical, smooth. Length of the three joints = 1: 4: 2, breadth = 2: 6: 10. Cephalis subspherical, with a thin oblique horn of the same length. Thorax with three stout ribs in its wall, and with subregular, hexagonal pores increasing in size towards the girdle. Abdomen flatter than the thorax, without ribs, nearly horizontal, with subregular, square pores, disposed in four to six concentric, subcircular series of different sizes; decreasing in size towards the wide open mouth. Seen from the side, this species resembles Corocalyptra agnesœ, (Pl. 59, fig. 3).

Length of the three joints, a 30µm, b 80µm, c 40µm; breadth, a 30µm, b 120µm, c 200µm.


Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: Lazarus et al. 2015 - "R age group"
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Lazarus et al. 2015 - "R age group"

Plot of occurrence data:


Haeckel, E (1887). Report on the Radiolaria collected by H.M.S. Challenger during the years 1873-1876. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the year 1873-1876, Zoology. 18: 1-1803. gs

Hull, D. M. (1993). Quaternary, Eocene, and Cretaceous Radiolarians from the Hawaiian Arch, Northern Equatorial Pacific Ocean. Proceedings of the Ocean Drilling Program, Scientific Results. 136: 3-25. gs


Theopilium tricostatum compiled by the radiolaria@mikrotax project team viewed: 16-4-2021

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