CATALOG OF ORIGINAL DESCRIPTIONS: Semantis triangularis 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 -> Semantis -> Semantis triangularis
Other pages this level: S. biforis, S. crescenda, S. dipyla, S. distephanus, S. distoma, S. micropora, S. sigillum, S. triangularis, S. triforis

Semantis triangularis

Citation: Semantis triangularis Clark & Campbell 1945
Rank: species
Type locality: LL598
Type specimens: pl.5, fig.7
Described on page(s) : p.29

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Current identification:

Original Description
Bilateral, subtriangular, fairly thick, prismatic (flattened inside, laterally compressed, and outwardly grooved) sagittal ring enclosing a similarly shaped gate; basal rod divergent, triangular, prominent, arborescent and having origin from 2 proximal branches which enclose an oval jugular pore; remaining parts of vertical ring having, save on lower 0.3, a double row of small, irregular, rarely branched thorns.

Size: Altitude of gate 60┬Ám.

Etymology: No information given

Extra details from original publication
Distinguishing features: This singular species resembles spinescens Haeckel (1887) = (Stephanolithes spinescens Ehrenberg 1875) from Barbados, but the gate is triangular instead of ovate, and the incipient feet (basal rods) are very different. There are more and smaller thorns on


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


Semantis triangularis compiled by the radiolaria@mikrotax project team viewed: 25-2-2021

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