CATALOG OF ORIGINAL DESCRIPTIONS: Lithochytris cheopsis 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 -> L -> Lithochytris -> Lithochytris cheopsis
Other pages this level: L. archaea, L. barbadensis, L. cheopsis, L. cortina, L. galeata, L. lanterna, L. lucerna, L. pileata, L. pteropus, L. pyramidalis, L. pyriformis, L. tripodium, L. vespertilio

Lithochytris cheopsis

Citation: Lithochytris cheopsis Clark & Campbell 1942
Rank: species
Type specimens: pl.9, fig.37
Type repository: University of California, Museum of Paleontology, San Francisco
Described on page(s) : p.81
Family (traditional): Theoperidae
Family (modern): Lychnocaniidae

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Current identification:


Original Description
Shell three-sided pyramidal, with indistinct collar and very slight lumbar constriction; length of the three segments 1:1:3.8, and the breadth 1:1.5:4.2 respectively; cephalis small, conical, with a very short horn; thorax truncate-conical, with slightly inflated sides and subspherical cavity; abdomen also truncate-conical, flat to concave-sided, with three, sharp, prominent, equidistant edges which are prolonged beyond the shell-base into three pyramidal, hollow, and fenestrated feet, distally the feet becoming round in cross section; the lower surface of the abdomen closed off by a pore-plate; pores of equal size in thorax and abdomen, in cephalis smaller, the upper part near the horn closed, in regular, vertical rows; wall everywhere thick.

Length of cephalis, 45µm (including the horn); of thorax, 45µm; of abdomen, 117µm; of feet, 70µm; breadth of cephalis (at base), 43µm; of thorax, 65µm; of abdomen (at tip of arms), 180µm; at base of arms, 60µm. Distinguishing characters (rw): Lithochytris cheopsis n. sp. resembles L. lucerna Haeckel (1887), a recent South Pacific species at 37° 29' 5., 83° 7' W., but differs in that the three joints have different proportions for the three joints of the two species, and also significantly longer feet in the Eocene species. It is interesting that several of the Eocene species of Radiolaria resemble those of the present Pacific Ocean.

Editors' Notes
[The authors here list this species under the subgeneric name Lithochytridium and include the subgeneric name in the species name.

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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Lithochytris cheopsis compiled by the radiolaria@mikrotax project team viewed: 7-3-2021

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