Daughter taxa (time control age-window is: 0-800Ma)![]() | ||||
![]() | Trigonastrum regulare neptune records: | |||
Trigonastrum sp. neptune records: |
Catalog entries: Trigonastrum
Original description: Porodiscida with three forked, chambered arms, connected by a patagium. (Arms and angles between them either equal or unequal.)
The genus Trigonastrum differs from the preceding Chitonastrum, its ancestral form, in the development of a patagium between the arms. It bears therefore to the latter the same relation that Euchitonia does to Rhopalastrum.
Geological Range:
Last occurrence (top): at top of Piacenzian Stage (100% up, 2.6Ma, in Piacenzian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Aquitanian Stage (0% up, 23Ma, in Aquitanian stage). Data source: Total of range of species in this database
Plot of occurrence data:
Haeckel, E (1887). Report on the Radiolaria collected by H.M.S. Challenger during the years 1873-1876. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the year 1873-1876, Zoology. 18: 1-1803. gsReferences:
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Trigonastrum compiled by the radiolaria@mikrotax project team viewed: 19-4-2021
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