Lithopera renzae

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


Citation: Lithopera renzae Sanfilippo & Riedel 1970
Rank: species
Basionym: Lithopera renzae
Taxonomic discussion: Sanfilippo and Riedel 1970 p 454 pl 1 figs 21-23+27

Catalog entries: Lithopera renzae

Original description: Subellipsoidal shell. of which the thorax forms the major part. Cephalis spherical. usually with small circular pores, half or more of it enclosed in the thoracic wall. with a small apical horn. Collar stricture not usually pronounced externally. From the base of the cephalis, primary lateral and dorsal spines extend in the thoracic wall or within the thoracic cavity to join the inner surface of the upper wall. Remainder of shell subellipsoidal, with pores very irregular in size and arrangement. tending to form a spongy meshwork especially in the upper part of the thorax. In some specimens the thoracic wall is not actually spongy, but the pores are divided by secondary bars. Inverted-hemispherical or inverted-conical abdomen usually separated from the larger thorax by a distinct stricture and change in contour.

(Based on 30 specimens) Maximum breadth 80-110┬Ám. Ratio of length of abdomen to length of thorax (measured from base of cephalis) (0.01-1.3):1. usually (0.3-0.7):1. Distinguishing characters (rw): L. renzae is distinguished from L. baueri by its less spongy meshwork, smaller size, and a lumbar stricture usually accompanied by a change in contour. It is distinguished from L. neotera as indicated under that species, and from Stichocorys diploconus by having a spongy wall and only three segments.
Remarks on original description: [The authors here list this species under the subgeneric name Lithopera and include the subgeneric name in the species name.


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:


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


Lithopera renzae compiled by the radiolaria@mikrotax project team viewed: 16-4-2021

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