Classification: rads_cenozoic -> Amphipyndacidae -> Amphipternis
Sister taxa: Amphipternis,
Daughter taxa: (blue => in age window 0-800Ma)

neptune records:

neptune records: 6

neptune records: 18


Citation: Amphipternis Foreman 1973
Rank: genus
Basionym: Amphipternis

Catalog entries: Amphipternis

Original description: Amphipyndacids with transverse, ring-like septum as in Amphipyndax. Collar structures (apical and vertical bars) depend from this septum into thoracic cavity where the primary and secondary lateral bars join the thoracic wall (figure 7).
Remarks on original description: This genus differs from Amphipyndax in having the collar structures elongated in the thoracic cavity rather than constricted and reuced to form a small chamber. Previously described species belonging to this genus include: Phormocampe alamedaensis Campbell and Clark, 1944b = ? Stichomitra alamedaensis (Campbell and Clark) Foreman, 1968, and Lithocampe ? clava Ehrenberg, 1873.

Stratigraphic range:Late Cretaceous.


Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of Chattian Stage (100% up, 23Ma, in Chattian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Danian Stage (0% up, 66Ma, in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:


Foreman, H. P. (1973b). Radiolaria from DSDP Leg 20. Initial Reports of the Deep Sea Drilling Project. 20: 249-305. gs


Amphipternis compiled by the radiolaria@mikrotax project team viewed: 20-10-2020

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