Heterohelix
Classification: pf_mesozoic -> Heterohelicidae -> Heterohelix
Sister taxa: Heterohelix, Spiroplecta ⟩⟨ Braunella, Hendersonites, Huberella, Laeviheterohelix, Planoheterohelix, Protoheterohelix, Pseudoguembelina, Pseudotextularia ⟩⟨ Planoglobulina, Ventilabrella, Gublerina, Praegublerina, Sigalia, Racemiguembelina ⟩⟨ Lunatriella, Rectoguembelina, Zeauvigerina
Daughter taxa (time control age-window is: 0-800Ma) | ||||
 |  |  | Heterohelix americana | |
| Heterohelix sp. Specimens which cannot be assigned to established species | ||||
Taxonomy
As noted by Frerichs and Gaskill (1978 p. 143), the type species of Heterohelix is Textilaria americana Ehrenberg, 1843 by original monotypy (hence Cushman's, 1927, p. 190, designation of Spiroplecta americana as the type of Heterohelix is invalid). Textilaria americana was first illustrated by Ehrenberg (1854, pl. 32 I, fig. 4a), and similar specimens were illustrated by Frerichs and Gaskill. The latter authors regarded Ehrenberg's pl. 32 I, figs. 13, 14 of Spiroplecta americana to be the microspheric generation of Heterohelix americana.
Original description: Cellulae primae nonnullis spirales. Tales formae forsan proprio generi addicendae sunt: Heterohelix.
Approximate translation (by JRY 2019 - with assistance from google translate)
Sometimes the first chambers are spirally arranged. These forms can perhaps be assigned their own genus: Heterohelix.
N.B. This brief description appears after the description of Textilaria americana and is used to distinguish this form from similar biserial forams without the initial spiral portion.
Entries in the Catalog of original descriptions: Heterohelix
Distinguishing features:
Parent taxon (Heterohelicidae): Aperture symmetrical, ranging from a low slit to a high arch at the base of the final chamber, becoming terminal in uniserial taxa.
This taxon: Initially planispiral, final 1 or 2 pairs of chambers subtriangular with a short blunt spine.
Morphology:
Geological Range:
Last occurrence (top): at top of W. archaeocretacea zone (100% up, 93.5Ma, in Turonian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within W. archaeocretacea zone (93.52-94.03Ma, base in Cenomanian stage). Data source: Total of ranges of species in this database
Plot of range and occurrence data:
- Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
- Triangles indicate an event for which a precise placement has been suggested
- See also: customisable plot Parent: Heterohelicidae
Cushman, J. A. (1927g). The designation of some genotypes in the foraminifera. Contributions from the Cushman Laboratory for Foraminiferal Research. 3(4): 188-190. gs 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 Frerichs, W. E. & Gaskill, C. H. (1978). Textilaria americana Ehrenberg: Type species of Heterohelix. Journal of Foraminiferal Research. 8(2): 143-146. gs Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gsReferences:
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Heterohelix compiled by the pforams@mikrotax project team viewed: 17-12-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110283 Go to Archive.is to create a permanent copy of this page - citation notes |
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