CATALOG OF ORIGINAL DESCRIPTIONS: Sethoconus woodfordi 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 -> S -> Sethoconus -> Sethoconus woodfordi
Other pages this level: S. anthocyrtis, S. bimarginatus, S. conicus, S. crinitus, S. dogieli, S. facetus, S. galea, S. hexagonalis, S. hyalinus, S. lophophaena, S. martini, S. myxobrachia, S. orthoceras, S. parvus, S. pileus, S. rayianus, S. reschetnjakae, S. setosus, S. subtilis, S. venosus, S. virgultus, S. woodfordi, S. woodfordi advena

Sethoconus woodfordi

Citation: Sethoconus woodfordi Campbell & Clark 1944
Rank: species
Type specimens: pl.6, fig.9
Type repository: University of California, Museum of Paleontology, San Francisco
Described on page(s) : p.43
Family (traditional): Theoperidae
Family (modern): Acropyramiidae

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Current identification:


Original Description
Shell narrowly conical, as a whole 7-22°; apical horn generally much like a blunt stub; cephalis longer than wide, narrowly biconvex, spindle-shaped, its neck only mildly constricted, free of pores and hyaline; thorax forming over 0.9 total length, with rather sudden change in contour in upper 0.3-0.5 from a cone of about 20-37° which has a basal diameter of 0.23-0.31 total length to either a subcylinder or a narrower cone of not over 10° in lower section, sometimes again contracted in apertural 0.3 or less; aperture more or less regularly circular, often ragged (torn?); wall of thorax hyaline; pores regularly subcircular, larger in lower than in upper shell but not with sudden change in size, fairly well spaced, distinct, with narrow, sharp frames around each pore which do not connect from pore to pore, about 10-12 pores in a row across diameter of lower shell and in 16 (down to 12) vertical rows.

Length of shell, 180µm; diameter of aperture, 40µm. Distinguishing characters (rw): Cephalis without pores, and there is a short horn, unlike gracilis (Haeckel, 1887), in which cephalis has pores and horn is long. Thorax slender and generally similar in two species; dimensions do not differ greatly. Previously described species, gracilis, is from Barbados. Sethoconus subtilis (Carnevale, 1908), from lower Miocene of Italy, has scattered, widely separated, transversely arranged, elliptical pores and is 237µm in length.

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

References:

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


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Sethoconus woodfordi compiled by the radiolaria@mikrotax project team viewed: 7-3-2021

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