CATALOG OF ORIGINAL DESCRIPTIONS: Tripocyrtis curtidiscus 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 -> T -> Tripocyrtis -> Tripocyrtis curtidiscus
Other pages this level: T. curtidiscus, T. plagoniscus, T. plectaniscus, T. pteides, T. tripodiscus

Tripocyrtis curtidiscus

Citation: Tripocyrtis curtidiscus Clark & Campbell 1942
Rank: species
Type specimens: pl.9, fig.28
Type repository: University of California, Museum of Paleontology, San Francisco
Described on page(s) : p.68
Family (traditional): Plagiacanthidae
Family (modern): Sethoperidae

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Current identification:


Original Description
Shell with strong apical horn and feet with limited lattice; apical horn long, with four strong, equal angles, each of the angles triangular with the base at the top of the cephalis, base wide, tips sharply pointed; cephalis large, subhemispherical, wider than high; thorax a simple skirtlike, latticed framework between the three legs, cut off from the cephalis by a distinct stricture and sharp change in contour; feet three, equal, equidistant, strong, arising at the margin of the cephalis, with strong longitudinal, raised rib along its entire length, free portion of the foot strong and thick, three-angled, with triangular blades forming its sides, the outermost of these developed from the rib on the latticed portion of the leg, tips blunted towar4 the ends; margin between the feet arched, somewhat irregular, and perhaps broken; wall thin, closely following the contour, dark; surface of horn and feet hyaline; of cephalis, with numerous, subcircular, unequal pores; framework of thorax with large, subcircular, unequal, sometimes anastomosed pores; internally the shell with a weak columella.

Length of shell, 130µm; of horn, 29.8µm; of cephalis, 40.8µm; of free portion of foot, 54.0µm; breadth of base of cephalis, 62.8µm; diameter of pores, 8.8-10.0µm. Distinguishing characters (rw): The photographed specimen was strongly tipped, and hence its proportions are not clearly indicated.
Tripocyrtis curtidiscus n. sp. differs from T. plectaniscus Haeckel (1887) and T. plagoniscus Haeckel (1887) in the character of the horn which is not branched and ornate and also in lesser development of the latticed skirt. The horn is not arborescent and not branching as in T. tripodiscus Haeckel (1887). All of these three species are from the Central Pacific.

References:

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


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Tripocyrtis curtidiscus compiled by the radiolaria@mikrotax project team viewed: 7-3-2021

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