CATALOG OF ORIGINAL DESCRIPTIONS: Sethopyramis pulcherrima Clark & Campbell 1945

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 -> Sethopyramis -> Sethopyramis pulcherrima
Other pages this level: S. acuticephala, S. akanthodes akanthodes, S. akanthodes leptopleura, S. aneotos, S. bicornis, S. cyclomma, S. dodecalactis, S. enneactis, S. fenestrata, S. hexagonalis, S. hexalactis, S. lucerna, S. magnifica, S. maxima, S. pulcherrima, S. quadrata [sec. junior hom], S. scalariformis, S. septimoangularis, S. spinosa, S. trapezoides, S. victori

Sethopyramis pulcherrima

Citation: Sethopyramis pulcherrima Clark & Campbell 1945
Rank: species
Type locality: LL598
Type specimens: pl.6, fig.3
Described on page(s) : p.39

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Current identification:

Original Description
Shell with 6 (or 7) flat sides and greatly enlarged cephalis, the latter structure generally like a huge door knob, relatively prominent (0.2 total length in length), with a simple convex free end, widest at about two-thirds of its length from the neck and inverted truncate-conical (37°) for most of the length, the neck nearly 0.5 total length in breadth, composed of a dense spongy or minutely alveolar mass, and with a tiny, sinuous, tubular cavity which extends only a short distance into its substance from the top of the thorax; radial to the spongy cephalic mass is a peripheral framework of thin bars, so arranged that cuboidal spaces of nearly similar sizes in several layers occur; this extra-central cephalic envelope is broken in our specimen so that its total distribution and form cannot be ascertained; pyramidal (30°) thorax apically truncate at the cervix, formed by the union of facets each of which has 8 (or more) thick transverse beams which are directly opposite on the different faces in regular tiers like the steps of a ladder; the rectangles thus formed by the beams and radial apophyses enclose squarish, rarely round windows (or pores), these always having rounded corners and commonly having tiny teeth; these windows graded in size from small to larger toward the aperture on the inner rims, the radial apophyses thick and, as the transverse beams are elliptical in section, very sharp on the free edges and provided with numerous sharp, triangular teeth as are also the transverse beams, especially numerous in the upper shell region; pores of upper shell often subdivided into a meshwork by 1 or more delicate vertical and 2 or more transverse or oblique bars, but the windows of the lower shell are wide open; aperture simple (broken?).

Size: Total length 320µm, of cephalis 67µm.

Etymology: No information given

Extra details from original publication
Distinguishing features: Sethopyramis pulcherrima n. sp. resembles enneactis Haeckel (1887, p.1254, pl.56, fig.7) in having a large cephalis, but this is not spongy as in our new fossil species. Haeckel's species was waveringly assigned to Cephalopyramis as a new genus. Haeckel a

Editors' Notes
The authors here list Sethopyramis pulcherrima under the subgeneric name Sestropyramis and include the subgeneric name in the species name.[comment from RadWorld database]


Clark, B. L. & Campbell, A. S. (1945). Radiolaria from the Kreyenhangen Formation near Los Banos, California. Geological Society of America, Memoir. 1-66. gs


Sethopyramis pulcherrima compiled by the radiolaria@mikrotax project team viewed: 18-6-2021

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