radiolaria - rads_cenozoic - Aspis velutochlamydosaurus

Aspis velutochlamydosaurus


Classification: rads_cenozoic -> Artostrobiidae -> Aspis -> Aspis velutochlamydosaurus
Sister taxa: A. murus, A. velutochlamydosaurus, A. sp.

Taxonomy

Citation: Aspis velutochlamydosaurus Nishimura 1992
Rank: species
Basionym: Aspis velutochlamydosaurus

Catalog entries: Aspis velutochlamydosaurus

Original description: Shell of three (?) segments; cephalis irregularly spherical, quite thick-walled, rough-surfaced, with several tube-like nodules externally, bearing a rod-like stout apical spine of which the base possesses a large pore, and a conical thick tube-like projection (probably V) with a large opening near the collar stricture. Thorax spindle-shaped cylindrical, its pores circular or subcircular with polygonal pore-frames regularly arranged with three solid, rod-like lateral wings/feet in the distal portion. Abdomen (?) commonly broken, only fragments of thin-walled lattice, its pores irregular.

(Based on 15 specimens) Overall height 110-132 µ, maximum width of thorax 58-62 µ, of cephalis 28-36 µ, length of feet 30-40 µ and of apical horn 20-30 µ. Distinguishing characters (rw): This form differs from Aspis murus in having an apical horn and three lateral wings/feet. There seems to be a close evolutionary relationship between both species. The two species do not co-occur: Aspis velutochlamydosaurus appears after Aspis murus disappears.

Description


Morphology:


Size:

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:


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Aspis velutochlamydosaurus compiled by the radiolaria@mikrotax project team viewed: 30-9-2022

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203269 Go to Archive.is to create a permanent copy of this page - citation notes



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