Spiroplecta

Daughter taxa (time control age-window is: 0-800Ma)
			Spiroplecta americana
			Spiroplecta sp. Specimens which cannot be assigned to established species

Taxonomy

Original description: XI. SPIROPLECTAE nomine appelavi (Spiral-Zöpfchen). Quod Clavulina Nodosariis, Sagrina Textulariis, est id Spiroplecta est Rotaliis. In statu juniore cellulae spiralem ordinem sequuntur in adulto alteroum.
Spiroplecta americana Textilariae americanae affinis est, quam nuper indicavi. Spirulina e Rotaliarum forma in Nodosariae. Spiroplecta in Textilariae formam abit.

Approximate translation: (JRY 2019)
Spiroplecta - new name (spiral-pigtail). As Clavulina in the Nodosarids, Sagrina in the Textulrarids so is Spiroplecta in the Rotalids. The juvenile chambers are spirally arranged follwing which in the adult they alternate.
Spiroplecta americana has affinty to Textilaria americana, as previously mentioned. Spirulina is in the form out of the Rotaliarum Nodosariae. Spiroplecta in the form Textilariae zero.

Entries in the Catalog of original descriptions: Spiroplecta

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 then biserial, chambers globular, aperture symmetrical, wall texture costate

Geological Range:
Last occurrence (top): at top of P. hariaensis zone (100% up, 66.4Ma, in Maastrichtian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within R. calcarata zone (75.06-75.91Ma, base in Campanian 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
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Heterohelicidae

Spiroplecta compiled by the pforams@mikrotax project team viewed: 12-1-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110535 Go to Archive.is to create a permanent copy of this page - citation notes

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