Catalog - Spiroplecta americana

CATALOG OF ORIGINAL DESCRIPTIONS: Spiroplecta americana Ehrenberg 1844

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.

Higher levels: pf_cat -> S -> Spiroplecta -> Spiroplecta americana
Other pages this level: S. americana, S. clarae

Spiroplecta americana

Citation: Spiroplecta americana Ehrenberg 1844
Rank: Species
Type specimens: P33
Type age (chronostrat): Maastrichtian
Type locality: from 6-8 above the base of a pit of the Seguin Tile and Brick Co., McQueeney, Guadalupe County, TX
Type repository: Washington; USNM

Current identification/main database link: Spiroplecta americana Ehrenberg 1844

Original Description

"Test minute and subtriangular in side view, the biserial portion flaring widely from the tiny planispiral coil, periphery broadly rounded; the 5-6 chambers of the coil are low and not much inflated, the later 6-11 biserially arranged chambers increasing rapidly in height so that later ones are inflated and subglobular; sutures distinct, straight, somewhat oblique, depressed; wall calcareous, hyaline, surface faintly striate, finely perforate; aperture a low arch at the inner margin of the final chamber, sometimes with a slight lip."



Extra details from original publication

Editors' Notes
Lectotoype designation: Cushman 1927 designated the genotype of Heterohelix as follows:
Heterohelix Ehrenberg, 1843. Two forms are given by Ehrenberg under his Spiroplecta americana: The form figured, Mikrogeologie, pl. 32, fig. 25, is here designated as the genotype of Heterohelix.
According to Loeblich (1951, p107) this effectively designates the speciemen in Mikrogeologie as the lectotype of S. americana.


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 V O

Ehrenberg, C. G. (1843b). Verbreitung und Einfluss des mikroscopischen Lebens in Süd- 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. (1844). Über 2 neue Lager von Gebirgsmassen aus Infusorien als Meers-Absatz in Nord-Amerika und eine Vergleichung derselben mit den organischen Kreidegebilden in Europa und Afrika. Bericht uber die zu Bekanntmachung geeigneten Verhandlungen der Koniglichen Preussische Akademie der Wissenschaften zu Berlin. 57-97. 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

Loeblich, A. R. (1951). Coiling in the Heterohelicidae. Contributions from the Cushman Foundation for Foraminiferal Research. 2: 106-110. gs V O


Spiroplecta americana compiled by the pforams@mikrotax project team viewed: 30-11-2022

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