radiolaria - rads_cat - Theocyrtis redondoensis radiolaria - rads_cat - Theocyrtis redondoensis

CATALOG OF ORIGINAL DESCRIPTIONS: Theocyrtis redondoensis 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 -> T -> Theocyrtis -> Theocyrtis redondoensis
Other pages this level: T. aculeata, T. ampla, T. andriashevi, T. careotuberosa, T. diabloensis, T. hirta, T. macroceros, T. mugaicus, T. perpumila, T. perysinos, T. proserpinae, T. ptychodes, T. redondoensis, T. setanios, T. triapenna, T. trimembris, T. tuberosa, T. turris

Theocyrtis redondoensis

Citation: Theocyrtis redondoensis Campbell & Clark 1944
taxonomic rank: species
Described on page(s) : p.49
Type specimens: pl.7, fig.4
Type repository: University of California, Museum of Paleontology, San Francisco
Family (traditional): Plagiacanthidae
Family (modern): Lophophaenidae

Current identification/main database link: Theocorys redondoensis (Campbell and Clark) Kling 1973

Original Description

Shall large, with two sharp strictures, one of most beautiful species in this collection (its length four apertural, or two maximum diameters); apical horn occipital in origin but arising freely from cephalic vertex, gracefully curved, and distally pointed; cephalis distinctly globular and knoblike, set off sharply by distinct cervical suture from thorax below it, relatively large (0.3 maximum diameter of shell, and with its neck about a third of that diameter); thorax greatly exceeding other shell segments in prominence, very nearly perfectly hemispherical, greatest diameter, at its middle (0.5 total length), widely open at oral end, there squarely truncated, and outside, around thick rim which encircles base of abdomen, a row of short downwardly directed spines; abdomen taperingly subcylindrical with two sides unlike with local bulges and rather general asymmetry (its origin 0.32, and its opening 0.25 total length of shell), and distal end widely open but with a short, flared, entire lip, squarely truncated; wall of thorax thick, of cephalis a little thinner, and of abdomen membranelike, latter readily torn cleanly off from remainder of shell so that majority of specimens appear formed of but two joints rather than three, and, in addition, horn is often torn off; surface of cephalis and of thorax roughened, latter much more so, otherwise shell glass-clear; pores of cephalis numerous, and very tiny, almost dotlike circles, very well separated, and in rather shallow depressions, freely scattered between surface tubercles, pores of thorax subuniformly circular, comparatively small for so large a species, perhaps as many as 75 around transverse axis, deeply sunken into hexagonal concavities or pits with blunt sepaloid points arising from frames; pores of abdomen subelliptical to subrectangular with rounded corners, freely scattered, not uniform in size but generally larger than those of thorax, perhaps a dozen in a vertical line and 20 around circumference, strikingly different from those of thorax.

Length, total, 240µm, of horn, 30µm, of cephalis, 50µm, of thorax 100µm; diameter of thoracic maximum, 120µm, of shell-aperture, 60µm, of thoracic pores, 6.6µm.

Extra details from original publication
Distinguishing characters: Theocyrtis redondoensis n. sp. unique and differs greatly in form, especially in large knoblike cephalis and inflated thorax from other described species.

Editors' Notes
[Campbell and Clark here list the species under the subgeneric name Theocorusca and include the subgeneric name in the species name.


Campbell, A. S. & Clark, B. L. (1944). Miocene radiolarian faunas from southern California. Geological Society of America, Special Papers. 51: 1-76. gs


Theocyrtis redondoensis compiled by the radiolaria@mikrotax project team viewed: 21-7-2024

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