radiolaria - rads_cat - Siphostichartus praecorona <title>radiolaria - rads_cat - Siphostichartus praecorona

CATALOG OF ORIGINAL DESCRIPTIONS: Siphostichartus praecorona 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 -> Siphostichartus -> Siphostichartus praecorona
Other pages this level: S. jahnae, S. praecorona

Siphostichartus praecorona

Citation: Siphostichartus praecorona Nigrini 1977
Rank: species
Described on page(s) : p.258
Type specimens: pl.2, figs.8,9
Type repository: Holotype, 778-32-2, A-R43/2; paratype. 77B-32-2, B-R39/2 (?) U.S. National Museum, Washington, D.C.
Family (traditional): Artostrobiidae
Family (modern): Artostrobiidae

Current identification/main database link: Siphostichartus praecorona Nigrini 1977


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. Distinguishing characters (rw): This species is similar to Phormostichoartus marylandicus, but the fourth segment is more inflated and intersegmental strictures are more pronounced.
Riedel and Sanfilippo (1971) noted and illustrated this species as Phormostichoartus sp.aff. P. corona. The specimen figured by them (pl.2J, fig.6) is a good example of what is herein called "transitional," with a well-developed vertical tube but only two pore rows on the abdomen. The specimen shown on plate 2J, figure 5 may also be "transitional" and could be called either S. corona or S. praecorona.
The prominently "necked" forms illustrated by Riedel and Sanfilippo (pl.3F, figs. 4, 5) are excluded from the present description because they have not been observed by this author. They have been described by Petrushevskaya and Kozlova (1972, p.539, pl.23, figs. 26,27) as Theocamptra formaster Petrushevskaya.
The specimen shown by Riedel and Sanfilippo (1971, pl.3F, fig.6) does not appear to have four segments and is also excluded.

Translation:

Size:

Etymology:
Precursor of S. corona and closely related to Phormostichoartus marylandicus, the precursor of P. doliolum.

Extra details from original publication

Editors' Notes

References:

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


logo

Siphostichartus praecorona compiled by the radiolaria@mikrotax project team viewed: 7-2-2023

Taxon Search:
Advanced Search
AphiaID: not found
Short stable page link: https://mikrotax.org/radiolaria/index.php?id=252431 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics