Quadrum eptabrachium

Distinguishing features:
Parent taxon (Quadrum): Stellate to cubiform nannoliths with walls formed from two cycles of 4-9 elements and no central opening or diaphragm. When cubiform, the elements are joined along sutures that go out to the mid-point of the 'cube' edges.
This taxon: Quadrum with 7 elements per cycle

Taxonomy:

Farinacci & Howe catalog pages: Q. eptabrachium *

Distinguishing features:
Parent taxon (Quadrum): Stellate to cubiform nannoliths with walls formed from two cycles of 4-9 elements and no central opening or diaphragm. When cubiform, the elements are joined along sutures that go out to the mid-point of the 'cube' edges.
This taxon: Quadrum with 7 elements per cycle

Morphology:

Geological Range:
Last occurrence (top): within Santonian Stage (83.64-86.26Ma, top in Santonian stage). Data source: Burnett 1998
First occurrence (base): within Turonian Stage (89.77-93.90Ma, base in Turonian stage). Data source: Burnett 1998

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Quadrum eptabrachium, synonyms included - Quadrum eptabrachium;
• See also space-time plot :: Samples map :: Parent: Quadrum

Quadrum eptabrachium compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 13-8-2022 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10969 Go to Archive.is to create a permanent copy of this page - citation notes

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