radiolaria - rads_cenozoic - Siphostichartus praecorona radiolaria - rads_cenozoic - Siphostichartus praecorona

Siphostichartus praecorona

Classification: rads_cenozoic -> Artostrobiidae -> Siphostichartus -> Siphostichartus praecorona
Sister taxa: S. corona, S. praecorona, S. sp.


Citation: Siphostichartus praecorona Nigrini 1977
taxonomic rank: species
Basionym: Siphostichartus praecorona
Taxonomic discussion: Nigrini 1977

Catalog entries: Siphostichartus praecorona

Original description: Four-segmented form with a smooth, thin-walled shell. Cephalis small, hemispherical, with a few small circular pores; short, apical horn may be present; vertical tube generally short, cylindrical, but forms transitional between S. praecorona and S. corona have a well-developed, but not flamboyant, duck-billed tube. Thorax inflated, slightly heavier than rest of shell with three transverse rows of circular pores. Abdomen may appear as a "neck" on the fourth segment or may be a discrete, but short segment with two or, as the form approaches S. corona, three or four transverse rows of circular pores. Termination ragged.


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:


Nigrini, C. A. (1977). Tropical Cenozoic Artostrobiidae (Radiolaria). Micropaleontology. 23(3): 241-269. gs


Siphostichartus praecorona compiled by the radiolaria@mikrotax project team viewed: 12-12-2023

Taxon Search:
Advanced Search

Short stable page link: Go to to create a permanent copy of this page - citation notes

Add Comment

* Required information
Captcha Image
Powered by Commentics


No comments yet. Be the first!