Trigonastrum


Classification: rads_cenozoic -> Spongodiscidae -> Spongodiscidae inc sed -> Trigonastrum
Sister taxa: Amphirhopalum, Coccolarcus, Euchitonia, Ommatogramma, Plectodiscus, Porodiscus, Spongasteriscus, Spongobrachium, Stylospongia, Tholodiscus, Trigonastrum
Daughter taxa: (blue => in age window 0-800Ma)
Trigonastrum regulare

neptune records:
Trigonastrum sp.

neptune records:

Taxonomy

Citation: Trigonastrum Haeckel 1887
Rank: genus
Basionym: Trigonastrum

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.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

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:

References:

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. gs


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Trigonastrum compiled by the radiolaria@mikrotax project team viewed: 24-11-2020

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Short stable page link: http://mikrotax.org/radiolaria/index.php?id=205932 Go to Archive.is to create a permanent copy of this page - citation notes



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