CATALOG OF ORIGINAL DESCRIPTIONS: Sethostylus logchophorus Clark & Campbell 1945

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 -> Sethostylus -> Sethostylus logchophorus
Other pages this level: S. acutus, S. dentatus, S. dicylindrus, S. distyliscus, S. hastatus, S. logchophorus, S. serratus, S. spicatus

Sethostylus logchophorus

Citation: Sethostylus logchophorus Clark & Campbell 1945
Rank: species
Type locality: LL598
Type specimens: pl.3, fig.8
Described on page(s) : p.21

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Current identification:

Original Description
Large phacoid cortical shell with the opposite broad faces spiny, its margin bearing 12 (or more) fairly long radial spines, and, at either of 2 opposite margins in 1 axis, a single larger polar (or main) spine; this longer pair of spines (length about 0.5 broad axis of cortical shell) similarly conical (about 3°), with minutely truncated tips, circular sections, and having widely flared, 3-bladed, prismatic bases; the more numerous shorter (length 0.5 main spines), conical (about 2°), radial spines have sharp tips, circular sections, and simple, barely flared bases; small (axis 0.22 that of outer shell) lenticular medullary shell proportioned similarly to larger outer shell; rodlike radial supporting beams few (2 opposite polar, and 8 or more median-radial), and only the polar pair continuous with the external marginal spines. Pores of cortical shell similarly circular and of uniform diameter, fairly closely set and rather numerous (approximately 10 in the equatorial radius); pores of medullary shell subhexagonal; framework of cortical shell a raised polygonal mesh from the nodes of which arise everywhere on the broad surfaces short, conical, sepaloid points (or by-spines), and which increase in length from the central region where they are longer; these are additional to the marginal and polar spines; framework of medullary shell a low hexagonal meshwork.

Size: Diameter of cortical phacoid shell 230µm, of medullary shell 50µm, of cortical pores 12.2µm; length of polar spines 120µm, of radial marginal spines 60µm, of sepaloid by-spines 20µm.

Etymology: No information given

Extra details from original publication
Distinguishing features: Our photographed specimen, which was the best one, is turned on its long axis and thus obscures some of the characters and prevents the proper measurement of some structures.||Sethostylus logchophorus n. sp. differs from other species in the spiny broad f

Editors' Notes
The authors here list Sethostylus logchophorus under the subgeneric name Heliostylus and include the subgeneric name in the species name.[comment from RadWorld database]


Clark, B. L. & Campbell, A. S. (1945). Radiolaria from the Kreyenhangen Formation near Los Banos, California. Geological Society of America, Memoir. 1-66. gs


Sethostylus logchophorus compiled by the radiolaria@mikrotax project team viewed: 4-3-2021

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