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radiolaria - rads_cat - Phormostichoartus fistula radiolaria - rads_cat - Phormostichoartus fistula

CATALOG OF ORIGINAL DESCRIPTIONS: Phormostichoartus fistula 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 -> P -> Phormostichoartus -> Phormostichoartus fistula
Other pages this level: P. ashbyi, P. fistula, P. pitomorphus, P. schneideri, P. strongi

Phormostichoartus fistula

Citation: Phormostichoartus fistula Nigrini 1977
Taxonomic rank: species
Described on page(s) : p.253
Type specimens: pl.1, figs.11-13
Type repository: Holotype, DSDP 8-77B-10-4, B-R40/4; paratype DSDP 8-77B-13-2, A-P14/2. (no catalog number) U.S. National Museum, Washington, D.C.
Family (traditional): Artostrobiidae
Family (modern): Artostrobiidae

Current identification/main database link: Phormostichoartus fistula Nigrini 1977


Original Description

Shell thick-walled, smooth, subcylindrical, consisting of four segments. Cephalis approximately spherical with well-developed, poreless vertical tube lying along thorax for about half thoracic length; few subcircular pores; no apical horn. Collar stricture indistinct. Thorax short, truncate conical with two or three transverse rows of relatively large subcircular pores. Lumbar stricture and post-lumbar strictures distinct but not pronounced. Sometimes post-lumbar stricture marked by smooth poreless band. Abdomen annular, elongate with five to eight closely spaced transverse rows of large subcircular pores.

(Based on 15 specimens) Total length 110-190 µ; length of cephalis and thorax 36-40 µ; length of abdomen 35-53 µ; length of fourth segment 35-70 µ; maximum breadth 65-83 µ

Fourth segment approximately same width as or narrower than abdomen; pores similar in size and shape to those on abdomen, usually in three or four transverse rows. Segment narrowing to poreless peristome, sometimes with small, poorly developed terminal teeth. In some specimens fourth segment is elongate with more pore rows, often becoming irregular in arrangement and shape.

Phylogeny: Uncertain; may be ancestor of Phormostichoartus corbula.

Editors' Notes
Eocene and Oligocene specimens usually incomplete, with fourth segment either broken or not originally developed. Characteristic vertical tube always well developed.

References:

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


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Phormostichoartus fistula compiled by the radiolaria@mikrotax project team viewed: 23-3-2025

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=252034 Go to Archive.is to create a permanent copy of this page - citation notes



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