arrayname: original
Taxonomy
Original description: Test wall microperforate, pores randomly scattered and averaging 0.9 mm in diameter, wall surface smooth. Test small, very low trochospiral, equatorial periphery rounded, weakly lobate in equatorial outline; chambers subglobular, increasing slowly in size, ultimate: penultimate chamber ratio averaging 1.05, dextrally or sinistrally coiled in 2 whorls with 6.5 to 7 chambers in the final whorl; sutures moderately depressed in last several chambers, weakly depressed to flush on earlier chambers, radial on umbilical and spiral sides; umbilicus shallow, comprising 26 to 30% of the test diameter; aperture an extraumbilical low arch that extends from near the equatorial peripheral margin nearly to the umbilicus, bordered by a narrow lip, with relict apertural lips surrounding the umbilicus.
Entries in the Catalog of original descriptions: Microhedbergella pseudoplanispira
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | aperture: | Extraumbilical | |
sp chamber shape: | coiling axis: | Low | periphery: | aperture border: | Thin lip | ||
umb chbr shape: | umbilicus: | periph margin shape: | Moderately rounded | accessory apertures: | Relict | ||
spiral sutures: | Moderately depressed | umb depth: | Shallow | wall texture: | Smooth | shell porosity: | Microperforate: <1µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 6.5-7 | 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 pseudoplanispira compiled by the pforams@mikrotax project team viewed: 21-4-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110352 Go to Archive.is to create a permanent copy of this page - citation notes |
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