CATALOG OF ORIGINAL DESCRIPTIONS: Spongatractus balbis Sanfilippo & Riedel 1973

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 -> Spongatractus -> Spongatractus balbis
Other pages this level: S. balbis, S. californicus, S. fusiformis, S. klausi, S. streptacanthus

Spongatractus balbis

Citation: Spongatractus balbis Sanfilippo & Riedel 1973
Rank: species
Type specimens: pl.2, figs.1-3,
Described on page(s) : p.518

<% linkedspecs %>

Current identification/main database link: Spongatractus balbis Sanfilippo & Riedel 1973


Original Description
Cortical shell ellipsoidal, thick-walled, with subcircular pores (approximately 8-13 on the half-equator), joined to the double medullary shell by bars lying approximately in the equatorial plane, and usually two bars collinear with the polar spines. On the surface of the cortical shell are one to three layers of meshwork formed by connection of the distal ends of small superficial thorns. Two-bladed polar spines are somewhat variable in form and size, but are commonly robust, about half as long as the cortical shell, with a change in contour from parallel-sided proximally to tapered distally.

Size: Based on 25 specimens. Major diameter of cortical shell (excluding external layers) 105-150 µ, its minor diameter 65-145 µ. Maximum diameter of outer medullary shell 30-50 µ.

Extra details from original publication
Distinguishing features: S. balbis is distinguished from S. pachystylus by the lesser development of external meshwork, and from members of the Axoprunum pierinae (Clark and Campbell, 1942) group (Sanfilippo and Riedel, 1973) by the presence of meshwork on the cortical shell. (Sa


Editors' Notes
The thick-walled ellipsoidal cortical shell is covered by one to three layers of spongy meshwork, formed by connection of the distal ends of superficial thorns. The cortical shell has approximately 8-13 subcircular pores on the half-equator. Two bladed polar spines are variable in form and size, commonly robust, about half as long as the cortical shell, with a change in contour from parallel-sided proximally to tapered distally. (Sanfilippo et al., 1985)[comment from RadWorld database]

References:

Sanfilippo, A. & Riedel, W. R. (1973). Cenozoic Radiolaria (exclusive of theoperids, artostrobiids and amphipyndacids) from the Gulf of Mexico, Deep Sea Drilling Project Leg 10. Initial Reports of the Deep Sea Drilling Project. 10: 475-608. gs


logo

Spongatractus balbis compiled by the radiolaria@mikrotax project team viewed: 24-11-2020

Taxon Search:
Advanced Search

Short stable page link: http://mikrotax.org/radiolaria/index.php?id=258902 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