radiolaria - rads_cat - Stylosphaera megaxyphos trixyphos

radiolaria - rads_cat - Stylosphaera megaxyphos trixyphos radiolaria - rads_cat - Stylosphaera megaxyphos trixyphos

CATALOG OF ORIGINAL DESCRIPTIONS: Stylosphaera megaxyphos trixyphos 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 trixyphos

Other pages this level: << < 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, S. terpsichore> >>

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

Stylosphaera megaxyphos trixyphos

Citation: Stylosphaera megaxyphos trixyphos Clark & Campbell 1942

Taxonomic rank: sub-species

Described on page(s) : p.25

Type specimens: pl.5, fig.9

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

Family (traditional): Actinommidae

Family (modern): Rhizosphaeridae

Current identification:

Original Description

Shell globular with three equal elongate spines all in the same plane, not so thick as in other subspecies and more like those of S. megaxyphos megaxyphos, n. subsp. – one of the spines at one pole, the other two about 35° at the opposite pole, subequal, about ten times their basal diameter in length, three-angled with the interfaces concave. 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, bars thick, dense, beams six in one plane, about a fourth the diameter of the polar spines.

Size:

Length of spines, 200µm; diameter of cortical shell, 170µm; medulIary shell, 48.4µm; of pores, 8.8µm; width of wall, 13.2µm.

Extra details from original publication

Distinguishing characters: This subspecies differs from the other subspecies of S. megaxyphos n. sp. in having three instead of two polar spines. It differs from S. trixyphophora n. sp. in the lack of spines on the cortical shell.

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 trixyphos 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=252780 Go to Archive.is to create a permanent copy of this page - citation notes

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