CATALOG OF ORIGINAL DESCRIPTIONS: Amphibrachium californicum 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 -> A -> Amphibrachium -> Amphibrachium californicum
Other pages this level: A. amphilonche, A. anomalum, A. armatum, A. californicum, A. capitatum, A. clavula, A. dilatatum, A. gracilis, A. indicum, A. lanceolatum, A. monstrosum, A. mugodscharicum, A. mugodscharicum acerosum, A. mugodscharicum carinatum, A. paleogenicum, A. planum, A. robustum, A. sponguroides

Amphibrachium californicum

Citation: Amphibrachium californicum Campbell & Clark 1944
Rank: species
Type locality: LL462
Type age (chronostrat): Late Cretaceous, Mesozoic.
Type specimens: pl.6, figs.2, 4
Type repository: University of California, Museum of Paleontology, Berkeley, Holotype: Slide No.34522, 34548..
Repository city: San Francisco
Described on page(s) : p.17

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Current identification:


Original Description
Shell of moderate size, circular with 2 opposite chambered arms; both polar arms similar in form and size, narrow quadrilateral (?) with several transverse septa or joints and 4 parallel vertical beams (distal ends of both arms broken and arms themselves much torn); round disc with 5 (or more) concentric, circular rings of equal breadth and with large central chamber, periphery of disc with numerous, short radial spines (at least 24 in a quadrant); pores squarish, of nearly uniform size and similar form, usually 2 on breadth of ring, and 4 across chambered arm; radial beams numerous (as many as spines), dividing rings into radial chambers.

Size: Diameter, of the disc, 13µm, of central chamber, 21µm, of pores, 6.6µm, width of arm, 25.4µm.

Etymology: [Probably after its occurrence in California]

Extra details from original publication
Distinguishing features: Amphibrachiurn californicum, n. sp., although incomplete specimens alone occur in our material differs from others of this genus in the shape of the arms and is most distinctive.


Editors' Notes
The authors here list Amphibrachium californicum. under the subgeneric name Amphibrachella and include the subgeneric name in the species name.[comment from RadWorld database]

References:

Campbell, A. S. & Clark, B. L. (1944b). Radiolaria from Upper Cretaceous of middle California. Geological Society of America, Special Papers. 57: 1-61. gs


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Amphibrachium californicum compiled by the radiolaria@mikrotax project team viewed: 9-3-2021

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