Stichocorys johnsoni

Classification: rads_cenozoic -> Theoperidae -> Eucyrtidiidae -> Stichocorys -> Stichocorys johnsoni
Sister taxa: S. armata, S. delmontensis, S. diploconus, S. greeni, S. johnsoni, S. negripontensis, S. peregrina, S. wolffii, S. sp.


Citation: Stichocorys johnsoni Caulet 1986
Rank: species
Basionym: Stichocorys johnsoni
Taxonomic discussion: Caulet 1986 p.851 pl.6 figs.5-6; Alexandrovich 1989 (ODP 111 SR) p.256 pl.3 fig.9 (synonymy)

Catalog entries: Stichocorys johnsoni

Original description: Shell with four (or more?) segments, distinctly separated by constrictions, the first three segments together forming a conical section. Cephalis subspherical, rough, poreless, and bearing a slightly curved apical horn generally longer than the first segment. Thorax subspherical, well developed, having 20-30 irregularly arranged subcircular pores. Third segment conical, longer and broader than any other, bearing two kinds of pores: ordinary small pores on the whole surface and a single row of pores twice as large as the others just below the lumbar stricture. Fourth segment generally ragged with smaller pores irregularly arranged. Entire apertural margin never observed.

Length of first, second and third segments 120-130 µ. Thoracic length 40 µ. Abdominal length 50-60 µ. Distinguishing characters (rw): Eucyrtidium diaphanes (Sanfilippo et al., 1973, p.221, pl.5, figs.12-14) also has a single row of large pores just below the lumbar stricture and is thus similar to this form, but its shell has a different shape and the stratigraphic range is quite different.
Remarks on original description: This species was first described from Indian Ocean material. Pacific Ocean forms of this species generally lack an indentation on the third segment.


Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Neogene Period (2.59-23.03Ma, top in Piacenzian stage). Data source: Lazarus et al. 2015 - "N age group"
First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Lazarus et al. 2015 - "N age group"

Plot of occurrence data:


Alexandrovich, J. M. (1989). Radiolarian biostratigraphy of ODP Leg 111, Site 677, eastern equatorial Pacific, late Miocene through Pleistocene. Proceedings of the Ocean Drilling Program, Scientific Results. 111: 245-262. gs V O

Caulet, J. (1986b). A refined radiolarian biostratigraphy for the Pleistocene of the temperate Indian Ocean. Marine Micropaleontology. 11: 217-229. gs


Stichocorys johnsoni compiled by the radiolaria@mikrotax project team viewed: 15-5-2021

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