radiolaria - rads_cat - Artocapsa livermorensis <title>radiolaria - rads_cat - Artocapsa livermorensis

CATALOG OF ORIGINAL DESCRIPTIONS: Artocapsa livermorensis Campbell & Clark 1944

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 -> A -> Artocapsa -> Artocapsa livermorensis
Other pages this level: A. armata, A. dunikowskyi, A. elegans, A. fusiformis, A. livermorensis, A. octocamera, A. quadricamera, A. spinosa

Artocapsa livermorensis

Citation: Artocapsa livermorensis Campbell & Clark 1944
Rank: species
Described on page(s) : p.45
Type specimens: pl.8, figs.10, 19, 21, 27
Type age (chronostrat): Late Cretaceous, Mesozoic.
Type locality: LL462
Type repository: University of California, Museum of Paleontology, Berkeley, Holotype: Slide No.. 34523, 34526, 34533.
Repository city: San Francisco

Current identification:


Original Description

Shell small, generally spindle-shaped, smooth and with 5 joints; apical horn very short, like a little stub, but conical, rarely rudimentary and sometimes acentric; shell as a whole biconical (35°-50° in upper section, 10° in longer portion, finally 45°-100° in short inverted conical terminal part); cephalis, thorax, and abdomen (forming first 3 joints) and postabdomen (ultimate 2-3 joints) regularly increasing in length and diameter according to positions in linear series from apical to apertural ends, except cephalis is relatively longer than other joints; lateral shell contour unmodified by more than minor modifications at strictures which are small transverse indentations marked by thin bands, otherwise contour regular, apertural end mostly simply conical with rounded sides, but may be hollow-conical, and always with either a short conical tooth or a longer spinelike rod; wall uniformly thin; surface smooth; pores largest on ultimate joint, often crossing strictures, very well separated In clear shell substance, double-contoured, shallow, rather strictly circular, although a few are squarish, and about 40 in number on ultimate joint where they are in 3 crude transverse rows, and in perhaps 5-6 rows in longer cephalis.

Translation:

Size:
Length, total, 140µm; diameter, maximum (at level of ultimate stricture), 40µm, of pores, 8.8µm.

Etymology:
No information given

Extra details from original publication
Distinguishing features: Artocapsa livermorensis n. sp., lacks pyramidal terminal spine of A. fusiformis (Haeckel, 1887), has only 5 joints, and is much smaller. It suggests, in outline, Stichocapsa biacuminata Rüst (1885, pl. 16, fig. 15).


Editors' Notes

References:

Campbell, A. S. & Clark, B. L. (1944b). Radiolaria from Upper Cretaceous of middle California. Geological Society of America, Special Papers. 57: 1-61. gs


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Artocapsa livermorensis compiled by the radiolaria@mikrotax project team viewed: 30-1-2023

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