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.

Taxonomy

Citation: Spirocyrtis subscalaris Nigrini 1977
taxonomic rank: species
Basionym: Spirocyrtis subscalaris
Synonyms:
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.

Description

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:

References:

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


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

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=205452 Go to Archive.is to create a permanent copy of this page - citation notes



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