CATALOG OF ORIGINAL DESCRIPTIONS: Acanthosphaera stalactites 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 -> A -> Acanthosphaera -> Acanthosphaera stalactites
Other pages this level: << < A. macropora, A. marginata, A. maxima, A. micropora, A. mucronata, A. octahedralis, A. pachyconcha, A. parvula, A. pentagonalis, A. pinchuda, A. polyacerosa, A. reticulata, A. setosa, A. simplex, A. spinosa, A. stalactites, A. tenera, A. teneriformis, A. tenuis, A. trichophora, A. zonaster

Acanthosphaera stalactites

Citation: Acanthosphaera stalactites Clark & Campbell 1945
Rank: species
Type specimens: pl.5, fig.4
Described on page(s) : p.16
Family (traditional): Actinommidae
Family (modern): Actinommidae

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Current identification:


Original Description
Simple, hollow, globular lattice-shell having 4 similarly circular pores of the same diameter on a radius; a raised, hexagonal meshwork encloses the single pores which lie at the bottom of a depressed, hyaline area within the pore-frames; 8 similar, basally flared radial spines, regularly opposite in pairs perpendicular to one another, exceed the shell-diameter by about 20 per cent; these spines are 3-bladed, prismatic with similar apically sharp points and angular interfaces (the spines as a whole mostly deflected in the distal 0.3); each blade bears at its middle a transverse ramule which is twice repeatedly branched; these ramules are again branched so that the total number of branches is 12.

Diameter of shell 62µm, of pores 10µm; length of radial spines 87µm. Distinguishing characters (rw): The repeated branching of the ramules of the spine-blades recalls a nearly similar condition in Hexancistra quadricuspis Haeckel (1887), but in that species the branches are terminal and much larger, and the radial spines as a whole are different in form.

Editors' Notes
[The authors here list Acanthosphaera stalactites under the subgeneric name Rhaphidocapsa and include the subgeneric name in the species name.

References:

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


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Acanthosphaera stalactites compiled by the radiolaria@mikrotax project team viewed: 19-4-2021

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