radiolaria - rads_cat - Spirocyrtis gyroscalaris radiolaria - rads_cat - Spirocyrtis gyroscalaris

CATALOG OF ORIGINAL DESCRIPTIONS: Spirocyrtis gyroscalaris Nigrini 1977

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.

Higher levels: rads_cat -> S -> Spirocyrtis -> Spirocyrtis gyroscalaris
Other pages this level: S. cornutella, S. diplospira, S. elegans, S. greeni, S. gyroscalaris, S. hemispira, S. hollisi, S. holospira, S. merospira, S. parvaturris, S. proboscis, S. scalaris, S. submerospira, S. subscalaris, S. subtilis

Spirocyrtis gyroscalaris

Citation: Spirocyrtis gyroscalaris Nigrini 1977
taxonomic rank: species
Described on page(s) : p.258
Type specimens: pl.2, figs.10,11
Type repository: Holotype. 77B-13-2, A-X28/1; paratype, 77B-13-2, A-J27/3. U.S. National Museum, Washington, D.C. [No catalog number given]
Family (traditional): Artostrobiidae
Family (modern): Artostrobiidae

Current identification/main database link: Spirocyrtis gyroscalaris Nigrini 1977

Original Description

Similar in form to S. scalaris, but the outline of the segments is rounded rather than angular; it is generally narrower than S. scalaris, becoming broader in younger sediments as it evolves into S. scalaris. Duck-billed vertical tube and three-bladed apical horn both well developed. Seven to nine segments of variable length with two to five rows of subcircular to rectangular pores per segment. Termination ragged.

(based on 70 specimens). Total length 130-180µm; maximum breadth 75-105µm.

Phylogeny: Ancestor of S. scalaris and descendant of S. subtilis.


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


Spirocyrtis gyroscalaris compiled by the radiolaria@mikrotax project team viewed: 19-6-2024

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