radiolaria - rads_cenozoic - Udan radiolaria - rads_cenozoic - Udan

Udan


Classification: rads_cenozoic -> Theoperidae -> Theoperidae inc sed -> Udan
Sister taxa: Anthocyrtoma, Aphetocyrtis, Archicorys, Cassideus, Conarachnium, Cyrtolagena, D. middouri, Diplocyclas, Eurystomoskevos, Lithapium, Lithomitrissa, Lophoconus, Lophocorys, Phrenocodon, Sethochytris, Sethoconus, Sethocyrtis, Stichocampe, Theocorys, Udan
Daughter taxa (time control age-window is: 0-800Ma)
Udan undulata

neptune records:
Udan sp.

neptune records:

Taxonomy

Citation: Udan Renz 1976
Taxonomic rank: genus
Basionym: Udan
Taxonomic discussion:

Catalog entries: Udan

Original description:
Description: Cyrtoid with an annulated shell, divided by three or more transverse stric­ tures into four or more annular segments with numerous (4-9 or more) radial apophyses. The mouth of the terminal segment is open and simple, lacking terminal feet. Six radial ribs or wings are present.

Type Species: Udan undulata n. sp.

Remarks: Haeckel did not provide a genus for Phormocampida with a simple uncon­ stricted mouth and without terminal feet but possessing 6 radial ribs or wings. This new genus combines characteristics of both the subfamilies Stichophormida and Stichophaenida in the family Phormocampida (superfamily Eucyrtidioidea according to the classifica­tion of Petrushevskaya 1971c). The generic name Udan is an anagram of the Latin word unda meaning wave. Gender feminine.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of Neogene Period (100% up, 2.6Ma, in Piacenzian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Renz, G. W. (1976). The distribution and ecology of Radiolaria in the central Pacific: plankton and surface sediments. Bulletin of the Scripps Institution of Oceanography. 22: 1-267. gs


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Udan compiled by the radiolaria@mikrotax project team viewed: 6-10-2026

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