Taxonomy
Original description: T. americana, parva, saepius microsc., celerius dilatata laevis, cellulis primis globosis (1/300 lineae l.), dein ovatis, summis in papillam superiorem externam productis subaculeatis.
Cellulae primae nonnullis spirales. Tales formae forsan proprio generi addicendae sunt: Heterohelix.
Translation (from Frerichs & Gaskill 1978)
T . americana, small, more often microscopic, rapidly expanding, smooth, first chamber globular (1/300 of a line), chambers ovate, final chambers produced into a spine.
Entries in the Catalog of original descriptions: Textilaria americana
Emended description:
Character matrix
| test outline: | Triangular | chamber arrangement: | Biserial | edge view: | Compressed | aperture: | Interiomarginal |
| sp chamber shape: | Globular | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin flange |
| umb chbr shape: | Globular | umbilicus: | N/A | periph margin shape: | Broadly rounded | accessory apertures: | N/A |
| spiral sutures: | Moderately depressed | umb depth: | N/A | wall texture: | Smooth | shell porosity: | Microperforate: <1µm |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 2-2 | 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:
Ehrenberg, C. G. (1843b). Verbreitung und Einfluss des mikroscopischen Lebens in Süd- und Nord Amerika. Bericht uber die zu Bekanntmachung geeigneten Verhandlungen der Koniglichen Preussische Akademie der Wissenschaften zu Berlin. 1841: 291-446. gs Ehrenberg, C. G. (1854). Mikrogeologie: Das Erden und Felsen schaffende Wirken des unsichtbar kleinen selbständigen Lebens auf der Erde. Leopold Voss, Leipzig. 1-374. gs Georgescu, M. D. & Huber, B. T. (2009). Early evolution of the Cretaceous serial planktic foraminifera (late Albian-Cenomanian). Journal of Foraminiferal Research. 39: 335-360. gs Missing or ambiguous references: Masters 1980; References:

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Heterohelix americana compiled by the pforams@mikrotax project team viewed: 22-1-2026
Short stable page link: https://mikrotax.org/pforams/index.php?id=110284 Go to Archive.is to create a permanent copy of this page - citation notes |
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