radiolaria - rads_cat - Stylosphaera megaxyphos tetraxyphos

radiolaria - rads_cat - Stylosphaera megaxyphos tetraxyphos radiolaria - rads_cat - Stylosphaera megaxyphos tetraxyphos

CATALOG OF ORIGINAL DESCRIPTIONS: Stylosphaera megaxyphos tetraxyphos Clark & Campbell 1942

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 -> Stylosphaera -> Stylosphaera megaxyphos tetraxyphos

Other pages this level: << < S. hexaxyphophora pentaxyphophora, S. hispida, S. holosphaera, S. isoporata, S. jugata, S. laevis, S. liostylus, S. lithatractus, S. losbanosensis, S. macropora, S. macropora microaculeata, S. megadictya, S. megaxyphos, S. megaxyphos megaxyphos, S. megaxyphos pentaxyphos, S. megaxyphos tetraxyphos, S. megaxyphos trixyphos, S. melpomene, S. minor, S. minor brevihastata, S. minor leptoxyphos, S. minor minor, S. musa, S. nana, S. polyhymnia, S. radiosa, S. raripora, S. setosa, S. simplex, S. spinulosa, S. sulcata> >>

Stylosphaera (Stylosphaerantha) megaxyphos tetraxyphos Clark and Campbell 1942.jpg

Stylosphaera megaxyphos tetraxyphos

Citation: Stylosphaera megaxyphos tetraxyphos Clark & Campbell 1942

Taxonomic rank: sub-species

Described on page(s) : p.26

Type specimens: pl.6, figs.6,8

Type repository: University of California, Museum of Paleontology, San Francisco

Family (traditional): Actinommidae

Family (modern): Rhizosphaeridae

Current identification:

Original Description

Shell globular with four elongate polar spines all in the same plane arranged in two pairs at opposite ends of the sphere some distance apart and at about 70° from the equator, about eight times their diameter in length, subequal, three-angled, with concave faces between the angles; cortical shell thick-walled, surface with subuniformly subcircular to oval pores, four to six across a radius, sunken into hexagonal areas with sepaloid projections; medullary shell small, less than a third the diameter of the cortical one, with three to five pores across a radius, and with rather thick bars, beams supporting it about a fourth the diameter of the polar spines, six visible on one plane. Length of polar spines, 185µm in one specimen in which the fourth spine is broken; diameter of the cortical shell, 150µm; of medullary shell, 44µm; of pores, 15.4µm; thickness of spines, 22µm; of wall, 11µm.

Extra details from original publication

Distinguishing characters: This subspecies differs chiefly from the bipolar typical species in having four instead of but two polar spines. Other minor differences are apparent in the description.
The type specimen, which is photographed, has one of the polar spines broken, and also at about 45° rather than at the more nearly normal 70°. The other specimen (Fig; 1) has the spines at right angles to each other, forming a cross.

Editors' Notes

The authors here list this subspecies under the subgeneric name Stylosphaerantha and include the subgeneric name in the species name.

References:
Clark, B. L. & Campbell, A. S. (1942a). Eocene radiolarian faunas from the Mt. Diablo area, California. Geological Society of America, Special Papers. 39: 1-112. gs

Stylosphaera megaxyphos tetraxyphos compiled by the radiolaria@mikrotax project team viewed: 29-4-2025

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=252779 Go to Archive.is to create a permanent copy of this page - citation notes

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