radiolaria - rads_cenozoic - Artobotrys auriculaleporis radiolaria - rads_cenozoic - Artobotrys auriculaleporis

Artobotrys auriculaleporis


Classification: rads_cenozoic -> Artostrobiidae -> Artobotrys -> Artobotrys auriculaleporis
Sister taxa: A. auriculaleporis, A. biaurita, A. borealis, A. sp.

Taxonomy

Citation: Artobotrys auriculaleporis (Clark and Campbell 1942)
taxonomic rank: species
Basionym: Lophophaena auriculaleporis Petrushevskaya and Kozlova 1979
Taxonomic discussion: (Clark and Campbell) 1942 p.89 pl.8 figs.20,27-29 as Lophophaena; Petrushevskaya and Kozlova 1979 p.137

Catalog entries: Lophophaena auriculaleporis

Original description: Shell small, with two strong, forked, very prominent apical horns, the larger one usually subvertical, 0.5 total length, and the smaller, subhorizontal one 0.3 total length, the tips sharp, the horns both very stout (about 3°), equally four-bladed, the angles decurrent distally, strong basally, slightly twisted, the level of origin not especially modified as the horns arise directly from the cephalis, the horns well-separated (45° in some, and 90° in other, individuals); cephalis small, asymmetrical with the top higher on the side with the vertical horn, wide, apically the space between the horns flattened, sides expanded from top to base, the basal diameter twice the height, the height only about 0.12 total length; thorax truncate-ovate (40° in the upper part, later 10° and finally 30° in the contracted 0.25 of thorax), the sides very strongly convex, trim, apertural end truncated squarely, the diameter 0.3 total length, with a thin, subregular, rounded rim like the moulded edge of a metal pail, the rim slightly irregular as if torn along the free edge; wall mostly thin, a little thicker at the top of the cephalis than elsewhere, generally neat; surface of horns, hyaline; of cephalis, hyaline save a scattering of small, pimplelike dots; of thorax, with a great many circular pores of several sizes, the largest pores being near the middle, and the smaller ones irregularly scattered among them and below, the pores all well-spaced, no pores just above the apertural rim, but a regular row is found exactly above the rim; framework light.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

Plot of occurrence data:

References:

Clark, B. L. & Campbell, A. S. (1942a). Eocene radiolarian faunas from the Mt. Diablo area, California. Geological Society of America, Special Papers. 39: 1-112. gs

Petrushevskaya, M. G. & Kozlova, G. E. (1979). Opisanie rodov i vidov radiolyariy [Description of the radiolarian genera and species.]. In, Sterlkov, A. A. & Petrushevskaya, M. G. (eds) Istoriya mikroplanktona Norvezhskogo Morya [The history of the microplankton of the Norwegian Sea (based on Deep Sea Drilling materials)]. Issledovanie Faunyi Morey (Akademii Nauk SSSR) Leningrad . 23(31): 86-157. gs O


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Artobotrys auriculaleporis compiled by the radiolaria@mikrotax project team viewed: 21-4-2024

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