Taxonomy
Original description: Test planispiral in general, the adult chambers sometimes slightly out of alignment, earlier chambers globular but very early developing a distal tubular extension, in general in a radial position, later chambers polyhedral and with as many as five tubular processes, three chambers making up each coil; suture fairly distinct, slightly depressed; wall smooth, calcareous, thick, finely perforated; aperture a low arched opening at the base of the chamber, in the earlier stages in the median line but in the adult extending outward to the umbilical area at least on one side, with a thin lip over the opening.
Entries in the Catalog of original descriptions: Hantkenina multispinata, Schackoina moliniensis, Hantkenina trituberculata, Schackoina cushmani
Character matrix
test outline: | Stellate | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Equatorial |
sp chamber shape: | Elongate | coiling axis: | Low | periphery: | - | aperture border: | Thin lip |
umb chbr shape: | Elongate | umbilicus: | Narrow | periph margin shape: | N/A | accessory apertures: | None |
spiral sutures: | Moderately depressed | umb depth: | Shallow | wall texture: | Smooth | shell porosity: | Finely Perforate: 1-2.5µm |
umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 3-4 | N.B. These characters are used for advanced search. N/A - not applicable |
Geological Range:
Last occurrence (top): within G. ventricosa zone (76.18-79.20Ma, top in Campanian stage). Data source: [copied from Chronos database]
First occurrence (base): within T. globotruncanoides zone (98.85-100.50Ma, base in Cenomanian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
Cushman, J. A. & Wickenden, R. T. D. (1930). The development of Hantkenina in the Cretaceous with a description of a new species. Contributions from the Cushman Laboratory for Foraminiferal Research. 6(2): 39-43. gs Leckie, M. (1984). Mid-Cretaceous planktonic foraminiferal biostratigraphy off Central Morocco, Deep Sea Drilling Project Leg 79, Sites 545 and 547. Initial Reports of the Deep Sea Drilling Project. 79: 579-620. gs Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs OReferences:
Schackoina multispinata compiled by the pforams@mikrotax project team viewed: 14-9-2024
Short stable page link: https://mikrotax.org/pforams/index.php?id=110523 Go to Archive.is to create a permanent copy of this page - citation notes |
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