Plummerita hantkeninoides

Taxonomy

Original description: The delicate asteroid test resembles the Middle Eocene Hantkenina (Aragonella) mexicana Cushman. Only the last five-chambered volution is visible. The chambers are arranged in an indistinct trochoidal spiral. The peripherally well-separated chambers are compressed, except the end chamber, which in some individuals is slightly inflated. The chambers are radially elongate and possess throughout the last whorl axially situated spines. The angles between the spines measure on the average 70 degrees. In general, the spines of the last chambers are smaller than those of the earlier ones. It is possible that this feature becomes obsolete in the course of the ontogenetic development. The umbilicus is indistinct, and the central areas on both sides are masked by matrix. The sutures are straight, shallow but clearly defined. The aperture is not known. The walls appear to be thick. The surface is rugose and, in a few specimens, even a kind of linear pattern can be observed. Due to the indistinct trochoidal spiral the direction of coiling cannot be determined.

Entries in the Catalog of original descriptions: Rugoglobigerina (Plummerella) hantkeninoides hantkeninoides, Rugoglobigerina (Plummerella) hantkeninoides costata, Rugoglobigerina (Plummerella) hantkeninoides inflata

Geological Range:
Last occurrence (top): within P. hantkeninoides zone (66.04-66.39Ma, top in Maastrichtian stage). Data source: [copied from Chronos database]
First occurrence (base): within A. mayaroensis zone (67.64-69.27Ma, base in Maastrichtian stage). Data source: [copied from Chronos 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
• (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Plummerita

Plummerita hantkeninoides compiled by the pforams@mikrotax project team viewed: 13-2-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/dinotax/index.php?id=110420 Go to Archive.is to create a permanent copy of this page - citation notes

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