arrayname: original 

Marginotruncana desioi

Taxonomy

Original description: "Taking as an average type of Globotruncana tricarinata the specimen illustrated by Cushman (1946, USGS Prof. Paper 206, pl. 61, fig. 18) as Globotruncana canaliculata, which has a normal number of chambbers (five or six) in the last whorl, there are tests with an exceptionally large number of chambers (seven or eight) in the last whorl. Pending a more detailed study on tricarinata types, the form of Cita with such a large number of chambers should be considered at least as a subspecies of Glt. tricarinata tricarinata and newly named Glt. tricarinata desioi. The new subspecies name is proposed after Prof. A. Desio, Head of the Geological Institute of the Milan University, who sponsored the paleontological investigation of Cita. Ref.: Globotruncana lapparenti tricarinata Cita (not Quereau) 1948, p. 15, pi. 4, fig. 4. Entirely double-keeled; peripheral band at right angles to the plane of coiling; test protruding (truncoconical) on the umbilical side (bourrelet umbilical generally strongly developed); raisedumbilical sutures, eight to nine chambers in the last volution (test more flattened and larger than in Globotruncana tricarinata tricarinata of Cushman (1946, loc. cit.))."

Entries in the Catalog of original descriptions: Globotruncana tricarinata desioi

Geological Range:
Last occurrence (top): within Santonian Stage (83.65-85.70Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within Turonian Stage (89.39-93.90Ma, base in Turonian 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: Marginotruncana

Marginotruncana desioi compiled by the pforams@mikrotax project team viewed: 17-3-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110333 Go to Archive.is to create a permanent copy of this page - citation notes

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