Lunatriella

Daughter taxa (time control age-window is: 0-800Ma)
			Lunatriella spinifera
			Lunatriella sp. Specimens which cannot be assigned to established species

Taxonomy

Original description: Test elongate; initial portion of nearly equi dimensional chambers arranged biserially like Heterohelix; later portion composed of vertically elongated chambers which form an irregularly uniserial pattern; sutures depressed: later chambers with or without spinelike lateral projections; aperture in early biserial chambers a high arch with lateral apertural lips: aperture in elongate later chambers terminal, the lateral apertural lips merging below the aperture into a troughlike projection which is attached to the preceding chamber; wall of radia lly arranged calcite, finely perforate.

Entries in the Catalog of original descriptions: Lunatriella

Distinguishing features:
Parent taxon (Heterohelicidae): Aperture symmetrical, ranging from a low slit to a high arch at the base of the final chamber, becoming terminal in uniserial taxa.
This taxon: Initially biserial, later chambers elongated and arranged in an irregular uniserial pattern

Geological Range:
Last occurrence (top): at top of W. archaeocretacea zone (100% up, 93.5Ma, in Turonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within W. archaeocretacea zone (93.52-94.03Ma, base in Cenomanian stage). Data source: Total of ranges of species in this database

Plot of range and 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
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Heterohelicidae

Lunatriella compiled by the pforams@mikrotax project team viewed: 11-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110325 Go to Archive.is to create a permanent copy of this page - citation notes

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