 alamedaensis Campbell and Clark 1944.jpg)
neptune records:
neptune records: 6
neptune records: 18
| Daughter taxa (time control age-window is: 0-800Ma) | ||||
| Amphipternis alamedaensis neptune records: | |||
| Amphipternis clava neptune records: 6 | |||
| Amphipternis sp. neptune records: 18 | ||||
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.
Geological Range:
Last occurrence (top): at top of Paleogene Period (100% up, 23Ma, in Aquitanian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Foreman, H. P. (1973a). Radiolaria from DSDP Leg 20. Initial Reports of the Deep Sea Drilling Project. 20: 249-305. gs References:
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Amphipternis compiled by the radiolaria@mikrotax project team viewed: 21-1-2025
Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203074 Go to Archive.is to create a permanent copy of this page - citation notes |
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