= Rugotruncana circumnodifer
= Rugotruncana nothi
= Globotruncana aegyptiaca
= Rugotruncana circumnodifer
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.
| | Rugotruncana ellisi Bronnimann and Brown 1956 = Rugotruncana circumnodifer | |
| | Rugotruncana nothi Bronnimann and Brown 1956 = Rugotruncana nothi | |
| | Rugotruncana skewesae Bronnimann and Brown 1956 = Globotruncana aegyptiaca | |
| | Rugotruncana tilevi Bronnimann and Brown 1956 = Rugotruncana circumnodifer |
Current identification/main database link: Rugotruncana Brönnimann and Brown 1956
See also: Globotruncana (Rugotruncana) - also used a sub-genus;
Original Description
The calcareous hyaline test is trochospirally coiled. The small early chambers are globular, inflated, and globigerine-like. Later chambers are very slightly to strongly flattened and exhibit a keeled, imperiorate, peripheral band. The early chambers are smooth walled, but some or all later chambers exhibit fine discontinuous costellae or traces of costellae. The principal aperture is rounded, interiomarginal, and opens into a relatively large umbilicus. Long apertural flaps extend into the umbilicus, and in later chambers form a protruded, imperforate, umbilical cover-plate with accessory apertures.
Extra details from original publication
Remarks: Rugotruncana, n. gen., is very similar to Globotruncana, but the latter has no costellae or traces of them. Some workers may regard Rugotruncanas as homeomorphs of Globotruncanas. Although the morphologic differences between the two genera are slight, they cannot be regarded as true homeomorphs because of the existence of the morphologic differences. In practice the differences are not always apparent, and some workers may prefer to apply the name Globotruncana to forms of Rugotruncana, n. gen.
Age: Campanian to Maastrichtian.
References:
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Rugotruncana compiled by the pforams@mikrotax project team viewed: 28-10-2020
Short stable page link: http://mikrotax.org/pforams/index.php?id=132209 Go to Archive.is to create a permanent copy of this page - citation notes |