Catalog - Globigerina elongata

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.

Globigerina elongata

Citation: Globigerina elongata d'Orbigny 1826

Type age (chronostrat): Not designated. Levels given: Fossil and Recent.

Type locality: Not designated. Localities given: Castel-Arquato, Plaisantin, Italy [Fossil]; Adriatic Sea, near Rimini, Italy [Recent].

Type repository: Paris, MNHN, Lab de PalŽontologie; Lectotype designated by Banner & Blow 1960

Description of lectotype: The sub-tetrahedroid test consists of about ten chambers arranged in a high, tightly coiled trochospire of about three whorls. There are three chambers visible in each of the whorls. The equatorial profile is sub-triangular to subquadrate; the equatorial periphery is weakly lobate. The axial profile resembles a rounded and truncated cone; the axial periphery is rounded. In dorsal view, the chambers are reniform to sub-rectangular and are distinctly longer tangentially than they are broad radially. In ventral (umbilical) view the chambers are ovoid to sub-rectangular. The chambers are both laterally compressed and depressed, and are weakly inflated and moderately embracing. The sutures are distinct but only slightly depressed. The umbilicus is virtually closed and is very shallow. The apertures are multiple; the primary aperture is a large, almost completely circular opening, with an indistinct and slightly thickened rim, situated immediately above the penultimate intercameral suture. The dorsal supplementary apertures are small but strongly arched openings and are situated in the spiral suture at its junction with the intercameral sutures. Only one supplementary aperture is visible in each chamber. The wall is thick and is uniformly and coarsely perforate. The surface of the obtained from the Adriatic Sea near Rimini. The test is strongly cancellate and rough. [Banner & Blow 1960]

Maximum diameter of lectotype: 0.36 mm. [Banner & Blow 1960]

Synyonym: Polymorphium tuberosum et globigerum, Soldani, 1789-1799, Testaceographiae ac Zoophytographiae parvae et microscopicae. Tome 2. Senis: F. Rossi, p. 117, pl. 123, fig. K.

FROM Banner & Blow (1960)
Taxonomic remarks: D'Orbigny, in 1826, named as new Globigerina elongata, giving no description or illustration but merely referring to a figure in the nonLinneian work of Soldani (1791). We consider that this figure (copied here) is not recognisable with certainty but may be referable to the genus Bulimina. However, as all the specimens determined by d'Orbigny as Clobigerina elongata up to the time of first publication of this name can be regarded as syntypic -(R. V. Melville, verb.), we were able to select, from the series of 14 specimens obtained by d'Orbigny from the vicinity of Rimini (a syntypic locality) and preserved in the Museum National de I'Histoire Naturelle, Paris, a specimen which is here illustrated and designated as lectotype of Globigerina elongata d'Orbigny 1826 (pI. 3, figs. lOa-c).
We have been careful to ascertain from the Assistant Secretary to the International Commission on Zoological Nomenclature (Mr. R. V. Melville) that, although the publication of the name G. elongata in 1826 is valid only insofar as it refers to a Soldani specimen, as no type specimen was selected by d'Orbigny, the Soldani specimen is merely syntypic and has a rank no greater than d'Orbigny's own identified specimens of that time. Whether or not the forms involved are actually conspecific (or even congeneric) matters only to the extent that d'Orbigny considered them so. Consequently, we selected from d'Orbigny's syntypic series the specimen which matched as closely as possible that drawn under this name in the "Planches Inedites"" of d'Orbigny which were actually drawn prior to 1826 (fide M. Lys, 1950) but not published until 1899 by Fornasini.
The lectotype is now isolated in a single-celled slide and remains in the A. d'Orbigny collections in Paris. [Banner & Blow 1960]

Remarks: This species is referable to the genus Globigerinoides Cushman 1927 as restricted by Bolli, Loeblich and Tappan 1957 (see also Banner and Blow, 1959). The species G. elongatus d'Orbigny is considered here to be quite distinct from Globigerinoides ruber both in morphology and stratigraphic ccurrence. The distinctions between this form and G. ruber are discussed under the latter species. It is considered that the height of the spire can vary considerably in G. elongatus and this feature does not seem to be of either taxonomic or stratigraphic value. The biocharacters of importance are believed to be the high but equidimensional primary aperture, the shape and position of the supplementary apertures, the tightly coiled and relatively uninflated chambers and the characteristically thick and rough wall. G. elongatus shows some resemblances to the form described by Bolli as Globigerinoides diminutus (Bolli, 1957) but the latter has more embracing chambers and a more circular axial and equatorial profile, as well as a smaller, more semicircular primary aperture. G. diminutus Bolli has a very restricted range within the Aquitanian (Lower Miocene). Forms which have been referred to this species have been recorded from the Burdigalian (Todd, 1957) but it is doubtful whether Todd's form is strictly synonymous. A. G. I. P. Mineraria (1957) have recorded G. elongatus from the Tortonian to Quaternary and their illustrated specimen from the Pliocene is agreed to belong to this species. We ourselves have observed this species throughout the Pliocene and Pleistocene of Sicily as well as in the Recent. It is possible that some of the stratigraphically older records may refer either to Globigerinoides ruber d'Orbigny or Globigerinoides subquadratus Bronnimann 1954.[Banner & Blow 1960]"

References:

Banner, F. T. & Blow, W. H. (1960a). Some primary types of species belonging to the superfamily Globigerinaceae. Contributions from the Cushman Foundation for Foraminiferal Research. 11: 1-41. gs O

d'Orbigny, A. (1826). Tableau methodique de la Classe de Cephalopodes. Annales des Sciences Naturelles, Paris. 7: 245-314. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina elongata d'Orbigny 1826

Globigerina elongata

References:

Add Comment

Comments