Catalog - Rugotruncana

Catalog - Rugotruncana <title>Catalog - Rugotruncana

CATALOG OF ORIGINAL DESCRIPTIONS: Rugotruncana Brönnimann and Brown 1956

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 -> R -> Rugotruncana

Other pages this level: Racemiguembelina, Rectoguembelina, Riveroinella, Rosalina, Rosalinella, Rotalia, Rotalina, Rotalipora, Rotundina, Rugoglobigerina, Rugoglobigerina (Archaeoglobigerina), Rugoglobigerina (Plummerella), Rugoglobigerina (Rugoglobigerina), Rugotruncana

			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

Rugotruncana

Citation: Rugotruncana Brönnimann and Brown 1956

Rank: Genus

Type species: Rugotruncana tilevi Brönnimann & Brown 1956

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.

Size:

Etymology:

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.

Editors' Notes