radiolaria - rads_cenozoic - Enneaphormis rotula

Enneaphormis rotula

Classification: rads_cenozoic -> Plagiacanthidae -> Sethophormididae -> Enneaphormis -> Enneaphormis rotula
Sister taxa: E. rotula, E. sp.


Citation: Enneaphormis rotula Haeckel 1887
Rank: species
Basionym: Enneaphormis rotula

Catalog entries: Sethophormis rotula

Original description: Cephalis very large, flat, cap-shaped, trilobed, with irregular, polygonal network. Horizontal collar-ring stout, hexagonal, with three larger and three alternate smaller sides of half the length. From the middle of the three larger sides arise three horizontal, centripetal, radial beams, which are united in the centre of the collar-septum - the three primary cortinar beams. These are prolonged outside into three centrifugal primary ribs of the thorax. From the six corners of the collar-ring arise six other secondary, thoracic ribs, equal in size and similar in form to the three primary. Each of these nine equal, straight ribs of the thorax is thickened towards the distal end, and bears at equal distances five pairs of opposite (tangential) lateral branches. The opposite branches of the neighbouring spines become united, and lie nearly horizontally in one plane, so that the flat, discoidal thorax is like a nine-angled wheel with nine equally distant spokes and five concentric, nine angled rings.
Remarks on original description: Haeckel listed Sethophormis rotula under the subgeneric name Enneaphormis and uses it in the other name, Enneaphormis rotula, in the figure description.[comment from RadWorld database]




Biogeography and Palaeobiology

Similar species

Geographic distribution


Phylogenetic relations

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Lazarus et al. 2015 - "R age group"
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Lazarus et al. 2015 - "R age group"

Plot of occurrence data:



Enneaphormis rotula compiled by the radiolaria@mikrotax project team viewed: 3-12-2022

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