radiolaria - rads_cenozoic - Spirocyrtis subscalaris radiolaria - rads_cenozoic - Spirocyrtis subscalaris

Spirocyrtis subscalaris

Classification: rads_cenozoic -> Artostrobiidae -> Spirocyrtis -> Spirocyrtis subscalaris
Sister taxa: S. greeni, S. gyroscalaris, S. scalaris, S. subscalaris, S. subtilis, S. sp.


Citation: Spirocyrtis subscalaris Nigrini 1977
taxonomic rank: species
Basionym: Spirocyrtis subscalaris
1977 Spirocyrtis subscalaris - Nigrini pl. 3, figs. 1, 2
Taxonomic discussion: Nigrini 1977

Catalog entries: Spirocyrtis subscalaris

Original description: Shell conical, smooth with four to six postcephalic segments. Cephalis hemispherical with a few subcircular pores, a strong 3-bladed apical horn approximately as long as cephalis, and a well-developed, duck-billed vertical tube. Collar stricture indistinct.
Thorax inflated with three or four transverse rows of relatively large subcircular pores. Lumbar and post-lumbar strictures clearly visible and often marked by a poreless band.
Abdomen and post-abdominal segments inflated, increasing in size distally. Each segment bears four or more transverse rows of subcircular pores of variable size.
Termination usually ragged. but rarely a short poreless peristome with very small, irregularly spaced peglike teeth has been observed.


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:


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


Spirocyrtis subscalaris compiled by the radiolaria@mikrotax project team viewed: 17-6-2024

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!