Catalog - Rotalia limbata Catalog - Rotalia limbata

CATALOG OF ORIGINAL DESCRIPTIONS: Rotalia limbata d'Orbigny, in Fornasini 1902

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 -> Rotalia -> Rotalia limbata
Other pages this level: R. aspera, R. concavata, R. deeckei, R. elevata, R. limbata, R. menardii, R. nitida

Rotalia limbata

Citation: Rotalia limbata d'Orbigny, in Fornasini 1902
taxonomic rank: species
Type specimens: Lectotype designated by Banner & Blow 1960
Type age (chronostrat): [d'Orbigny, 1826]: Recent.
Type locality: [d'Orbigny 1826]: La mer Adriatique, près Rimini, Italie.
Type repository: Paris, MNHN, Lab de PalŽontologie

Current identification/main database link: Globorotalia limbata d'Orbigny, in Fornasini 1902

Original Description

La R. limbata è conosciuta soltanto per la figura de le 'Planches inedites' che pubblico qui accanto, da cui si rileva che essa è difficilmente separabile da la Pulvinulina menardi, quale è riprodotta dal modello 10 e anche da Brady (Chall., tav. CIII, fig. 1, 2). [Fornasini 1902, p. 56]

Description of lectotype: The test consists of 14 chambers arranged in about 2½ whorls comprising a low trochospire with 6 chambers present in the last whorl. The equatorial profile is sub-circular and the equatorial periphery is moderately lobulate. The axial profile is rhomboidal with an acute carinate periphery. The test is somewhat compressed dorso-ventrally alid is almost equally biconvex. The chambers are uniformly and regularly enlarging (with the exception of the abnormally reduced final chamber); in dorsal aspect they are semi-circular, little inflated and do not embrace. In ventral view the chambers are subtriangular, slightly inflated and partially embracing. The dorsal sutures are slightly depressed and are limbate, being thickened by a deposit of clear shell material which is continuous with the imperforate peripheral carina. The dorsal intercameral sutures are, for the most part, smoothly curved but in the last few chambers they become angular. These sutures meet the spiral suture at right angles and recurve to become almost tangential to the periphery. The ventral intercameral sutures are depressed, not thickened or limbate, but are slightly curved or slightly sinuous and become nearly radial. The umbilicus is small, open and fairly deep. The primary aperture is a low interiomarginal arch, extending from the umbilicus almost to the periphery; it possesses a thin and narrow lip along its length. The apertural face is sub-triangular in apertural view and is only slightly flattened, not being clearly delimited from the ventral face of the last chamber. The umbilical shoulders of the ventral surfaces of the chambers are weakly developed. The wall is finely and uniformly perforate, except for the areas of the imperforate peripheral carina and the dorsal sutural limbations. The surface of the test is smooth except for a weakly developed pustulose area on the ventral side of the first chamber of the last whorl, facing the primary aperture. [Banner & Blow 1960, p30-31]

Maximum diameter of lectotype: 0.44 mm. The lectotype has suffered slight damage and parts of the periphery of the last two chambers have been lost. [Banner & Blow 1960]

Extra details from original publication
Synonym - Rotalia limbata d'Orbigny, 1826, Ann. Sci. Nat., vol. VII, pag. 274, num. 30 [nomen nudum].


Taxonomic remarks: When d'Orbigny (1826) proposed the name Rotalia limbata for specimens he had obtained from the Adriatic sea near to Rimini, he neither described nor illustrated the species. As not even a synonymous reference was given in 1826 the species was nomen nudum and it did not become taxonomically available until Fornasini published d'Orbigny's drawings in 1902.

In the A. d'Orbigny collections in Paris a tube labelled "Rotalia limbata d'Orb. (Subapennin) Rimini" contains the only surviving syntypic specimen of this species. This specimen is here designated, illustrated and described as lectotype of Rotalia limbata d'Orbigny. [Banner & Blow 1960]

Remarks: This species-has not been recorded in the literature as far as we are aware. Most authors appear to have followed Fornasini (1902, p. 56) in considering it difficult to separate from Globorotalia menardii (d'Orbigny) auct. We believe it to be a junior synonym of Rotalina cultrata d'Orbigny 1839, (see p. 34). [Banner & Blow 1960]


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

Fornasini, C. (1902). Sinossi metodica dei foraminiferi sin qui rinvenuti nella sabbia del lido di Rimini. Memorie della Reale Accademia della scienze dell'Istituto di Bologna. 10: 1-68. gs O


Rotalia limbata compiled by the pforams@mikrotax project team viewed: 18-7-2024

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