pforams@mikrotax - Lunatriella spinifera

Lunatriella spinifera

Classification: pf_mesozoic -> Heterohelicidae -> Lunatriella -> Lunatriella spinifera
Sister taxa: L. spinifera, L. sp.


Citation: Lunatriella spinifera Eicher and Worstell 1970
Rank: Species
Basionym: Lunatriella spinifera

Type images:

Original description: Test elongate, compressed; initial biserial portion consisting of up to four pairs of subglobular chambers ; later chambers becoming increasingly elongate vertically, with curved axes convex outward ; final one to three elongate chambers in fully developed specimens irregularly uniserial, the chambers arcing alternately right and left; commonly the last chamber and rarely the last two chambers of the uniserial portion having a large aboral spine like elongation protruding at an angle that varies greatly among specimens; sutures distinct, depressed, strongly curved in later chambers of biserial portion, slanting alternately right and left in uniserial portion; aperture in early chambers a high arch bounded by lateral lips, which become increasingly elongate as chambers increase in height. In elongate but still biserially arranged chambers the lateral lips join below the aperture to form a trough like flange (here termed the "apertural trough"), which extends downward to the top of the chamber below. In uniserially arranged chambers the apertural trough commonly forms a delicate flying buttress separated from the main body of the test by a window; wall of radially built calcite, finely perforate.

Entries in the Catalog of original descriptions: Lunatriella spinifera

Emended description:


Wall type:


Character matrix
test outline:Subtriangularchamber arrangement:Biserialedge view:Compressedaperture:Interiomarginal
sp chamber shape:Elongatecoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Elongateumbilicus:N/Aperiph margin shape:Moderately roundedaccessory apertures:N/A
spiral sutures:Moderately depressedumb depth:N/Awall texture:Finely pustuloseshell porosity:
umbilical or test sutures:Moderately depressedfinal-whorl chambers:1.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

Geological Range:
Last occurrence (top): within W. archaeocretacea zone (93.52-94.03Ma, top in Turonian stage). Data source: [copied from Chronos database]
First occurrence (base): within W. archaeocretacea zone (93.52-94.03Ma, base in Cenomanian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:


Eicher, D. L. & Worstell, P. (1970). Lunatriella, a Cretaceous heterohelicid foraminifer from the western interior of the United States. Micropaleontology. 16(1): 117-121. gs


Lunatriella spinifera compiled by the pforams@mikrotax project team viewed: 28-9-2022

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Comments (1)

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Jeremy Young (UCL, UK)
surely this is one of the most ornate species?
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