arrayname: original
Taxonomy
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
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | aperture: | ||
sp chamber shape: | coiling axis: | Low | periphery: | aperture border: | Thin lip | ||
umb chbr shape: | umbilicus: | Narrow | periph margin shape: | Moderately rounded | accessory apertures: | ||
spiral sutures: | Moderately depressed | umb depth: | wall texture: | Finely pustulose | shell porosity: | Microperforate: <1µm | |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 4.5-5 | N.B. These characters are used for advanced search. N/A - not applicable |
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:
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. gsReferences:
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Microhedbergella pseudodelrioensis compiled by the pforams@mikrotax project team viewed: 21-4-2025
Short stable page link: https://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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