Lithopera thornburgi


Classification: rads_cenozoic -> Theoperidae -> Eucyrtidiidae -> Lithopera -> Lithopera thornburgi
Sister taxa: L. bacca, L. baueri, L. neotera, L. renzae, L. thornburgi, L. sp.

Taxonomy

Citation: Lithopera thornburgi Sanfilippo & Riedel 1970
Rank: species
Basionym: Lithopera thornburgi
Taxonomic discussion: Sanfilippo and Riedel 1970 p 455 pl 2 figs 4-6

Catalog entries: Lithopera thornburgi

Original description: Spindle-shaped shell, tapering equally at both ends. Cephalis spherical, apparently poreless, completely enclosed in the spongy thoracic wall. Thorax spindle-shaped. tapering and closing distally, sometimes with a short terminal spine or acute cone. No third segment distinguished. Thoracic wall thick, of spongy meshwork, especially in the proximal half. The thoracic wall adjacent to the cephalis is of spongy meshwork and has some straight, rodlike elements developed within and projecting from it which are probably the primary spines.

(Based on 35 specimens) Total length 140-285µm. Maximum breadth usually 85-135µm, but rarely to 150µm. Distinguishing characters (rw): This species is distinguished from L. baueri by the facts that both ends are usually equally tapered and pointed. the cephalis is enclosed in the thoracic wall, and the thoracic wall is always spongy.
As is occasionally the case in L. baueri, in some specimens of L. thornburgi a change to smaller pores near the distal end of the thorax is associated with a change in contour, which is. however, not accompanied by an internal ring, such as would mark off a third segment (plate 2, figure 5).

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Neogene Period (2.59-23.03Ma, top in Piacenzian stage). Data source: Lazarus et al. 2015 - "N age group"
First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Lazarus et al. 2015 - "N age group"

Plot of occurrence data:

References:

Sanfilippo, A. & Riedel, W. R. (1970). Post-Eocene "closed" theoperid radiolarians. Micropaleontology. 16(4): 446-462. gs


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Lithopera thornburgi compiled by the radiolaria@mikrotax project team viewed: 11-4-2021

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