BannerBlow 1960 pl3-9.JPG
dOrbigny 1846 pl9 f11-14.JPG
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.
BannerBlow 1960 pl3-9.JPG
dOrbigny 1846 pl9 f11-14.JPGCurrent identification/main database link: Orbulina universa d’Orbigny, 1839
Taxonomic remarks. - d'Orbigny (1846) first described Globigerina bilobata from the Vindobonian marly clays near the village of Nussdorf, north of Vienna, Austria. For many years the gross morphology of this species was believed by many authors to be characteristic, even though its generic position was disputed. However, more recent work (Blow, 1956) has shown that superficially similar but actually distinct forms exist (e. g., Porticulasphaera transitoria (Blow, 1956);, and it proved necessary to be sure of the precise details of the type specimen of G. bilobata. The lectotype of Globigerina bilobata d'Orbigny, here designated, was selected from a named syntypic series present in the A. d'Orbigny collections, labelled "Tortonien, Nussdorf (Autriche) ,"" probably in Terquem's handwriting. On the reverse of the mount, a subsequent hand had written the reference to d'Orbigny's first description of G. bilobata (""p. 164, pI. 9, Fig. 11-14""). [Banner & Blow1960]
Original Description
Cette espèce, qu'on pourrait prendre, au premier aperçu, pour le jeune du G. bulloides, s'en distingue parce que les deux loges dont elle est composée sont plus grosses à elles seules que deux fois les plus fortes coquilles adultes complètes du G. bulloides. Elle s'en distingue encore par sa surface très largement criblée de trous infiniment plus grands. Son ouverture est à peine visible.
"Diese Gattung, welche man auf den ersten Blick, für das junge Thier der G. bulloides nehmen koennte, unterscheidet sich von derselben, weil die beiden Kammern, aus denen sie zusammengesetzt ist, an sich selbst dicker sind, ais zwei Mal die staerksten, erwachsenen, vollkommenen Schalen der G. bulloides.
Sie unterscheidet sich noch von derselben durch ihre von unendlich groessern Loechern sehr weit durchloecherte Oberflaeche. Ihre Oeffnung ist kaum sichtbar."
Description of lectotype: The large test is bilobate, consisting exteriorly of two sub-equal and partially embracing spheres, but without any external trace of any chambers earlier than the penultimate. The suture between the penultimate and last chamber is distinct and qepressed, and no apertural pores' were observed in the suture. No external primary aperture exists, but a very few apertural pores are present, apparently randomly distributed over both the ultimate and penultimate chambers. The wall is calcareous, radial in structure, and is uniformly and coarsely perforate, but otherwise smooth, with little trace of the original hispidity. The surfaces of the ultimate and penultimate chambers are virtually identical; and the wall thicknesses appear to be the same. [Banner & Blow 1960]
Size:
Extra details from original publication
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 d'Orbigny, A. (1840). Mémoire sur les foraminiféres de la craie blanche du bassin de Paris. Mémoires de la Société Géologique de France. 4(1): +34+-. gs d'Orbigny, A. (1846). Foraminiferes fossiles du bassin tertiaire de Vienne (Austriche). Gide et Companie, Paris. 1-312. gsReferences:
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Globigerina bilobata compiled by the pforams@mikrotax project team viewed: 9-6-2023
Short stables page link: https://mikrotax.org/pforams/index.php?id=130367 Go to Archive.is to create a permanent copy of this page - citation notes |
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