radiolaria - rads_cenozoic - Rhabdolithis ellida radiolaria - rads_cenozoic - Rhabdolithis ellida

Rhabdolithis ellida


Classification: rads_cenozoic -> Plagiacanthidae -> Plagiacanthidae (ss) -> Rhabdolithis -> Rhabdolithis ellida
Sister taxa: R. ellida, R. pipa, R. sp.

Taxonomy

Citation: Rhabdolithis ellida Sanfilippo & Riedel 1973
taxonomic rank: species
Basionym: Rhabdolithis ellida

Catalog entries: Rhabdolithis ellida

Original description: Spinelike skeleton, thickened and sigmoidally curved near one end, and bearing arborescent branches toward the other end. Skeletons usually broken, but rare examples show a short. delicate, median bar from which arise a tiny, thornlike axial spine, a longer, acicular vertical spine, arborescent lateral spines (more commonly primary laterals than secondary laterals), sometimes a dorsal spine, and a strong apical spine that constitutes the most robust part of the skeleton. Apical spine delicate proximally (where the arborescent spines arise), thicker distally, reaching maximal thickness at the sigmoid curse, and cleft terminally to form two short thorns. The sigmoidally curved part of the apical spine is directed \backward\" (approxtmately parallel to the median bar, and in such a position that if extended it might form the upper part of an original sagittal ring).
Remarks on original description: Although the sagittal ring is incomplete, this species seems more appropriately placed in the Acanthodesmiidae than in the Plagoniidae, because the spines arising from the median bar are highlv differentiated in a manner similar to those of manv acanthodesmiids. Rhabdohthis ellida ranges downward to the earliest Paleocene assemblages presently available, and we therefore base no opportunity to determine its phylogenetic development.[comment from RadWorld database]

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:


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Rhabdolithis ellida compiled by the radiolaria@mikrotax project team viewed: 22-2-2024

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=205276 Go to Archive.is to create a permanent copy of this page - citation notes



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