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Microhedbergella pseudodelrioensis


Classification: pf_mesozoic -> Hedbergellidae -> Microhedbergella -> Microhedbergella pseudodelrioensis
Sister taxa: M. albiana, M. intermedia, M. miniglobularis, M. praeplanispira, M. pseudodelrioensis, M. pseudoplanispira, M. pseudotrocoidea, M. renilaevis, M. rischi, M. sp.

Taxonomy

Citation: Microhedbergella pseudodelrioensis Huber & Leckie 2011
Rank: Species
Basionym: Microhedbergella pseudodelrioensis

Type images:

Original description: Test wall microperforate, pores randomly scattered, wall surface finely pustulose. Test moderate in size, low trochospiral, equatorial periphery rounded, equatorial outline weakly lobate, test thickness:diameter ratio averaging 0.56; chambers globular, increasing moderately in size, ultimate:penultimate chamber ratio averaging 1.0, antepenultimate:ultimate chamber ratio averaging 1.16, relatively tightly coiled dextrally or sinistrally in 2 whorls with 11 to 12 chambers in adult specimens, 4.5 to 5 chambers in the final whorl; sutures moderately depressed, radial on umbilical and spiral sides; umbilicus narrow, comprising 11 to 16% of the test diameter; aperture a low arch that extends from the umbilicus 1/2 to 3/4 of the distance toward the peripheral margin, bordered by a narrow lip that thickens toward the umbilicus.

Entries in the Catalog of original descriptions: Microhedbergella pseudodelrioensis

Geological Range:
Last occurrence (top): within T. primula zone (107.39-111.84Ma, top in Albian stage). Data source: [copied from Chronos database]
First occurrence (base): within M. rischi zone (112.40-112.96Ma, base in Albian stage). Data source: [copied from Chronos database]

Plot of range and occurrence data:

Character matrix

test outline:Lobatechamber arrangement:Trochospiraledge view:aperture:
sp chamber shape:coiling axis:Lowperiphery:aperture border:Thin lip
umb chbr shape:umbilicus:Narrowperiph margin shape:Moderately roundedaccessory apertures:
spiral sutures:Moderately depressedumb depth:wall texture:Finely pustuloseshell porosity:Microperforate: <1┬Ám
umbilical or test sutures:Moderately depressedfinal-whorl chambers:4.5-5.0 N.B. These characters are used for advanced search. N/A - not applicable

References:

Huber, B. T. & Leckie, R. M. (2011). Planktic foraminiferal species turnover across deep-sea Aptian/Albian boundary sections. Journal of Foraminiferal Research. 41: 53-95. gs


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Microhedbergella pseudodelrioensis compiled by the pforams@mikrotax project team viewed: 25-10-2020

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Short stable page link: http://mikrotax.org/pforams/index.php?id=110351 Go to Archive.is to create a permanent copy of this page - citation notes



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