Catalog - Rosalina marginata

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.

Other pages this level: R. canaliculata, R. linneiana, R. marginata, R. stuarti

Rosalina marginata

Citation: Rosalina marginata Reuss 1845

Type specimens: T. VIII, F. 54,74; T. XIII,, F68

Type age (chronostrat): Turonian (?)

Type locality: Not designated but found in Czech.

0,25—0,6'"gross, kreisrund, sehrniedergedrückt, scheiben- förmig. Das Gewinde sehr wenig erhaben, aus zwei Umgängen bestehend; der lezte mit 6 Kammern. Im Ganzen 10—12 Kammern, oval, sehr schief, bogenförmig. Jede ist auf der obern Fläche am äussern Rande mit einem sehr schmalen, erhabenen Saume eingefasst, in der Mitte sehr flach gewölbt oder selbst seicht konkav ; an der untern Fläche sind sie massig gewölbt und durch wenig tiefe Nähte gesondert die ,viel weniger schief verlaufen, als auf der obern Fläche. Der äussere Umfang der Kammern senkrecht abgestutzt. Die untere Fläche weit genabelt. Die Oberfläche des ganzen Gehäuses mit kleinen Spitzen dicht übersäet. T. VIII, F. 54 stellt einen Steinkern dar.

Ausserst häufig im Planermergel von Luschitz, Rannay, Brozan, Kaut, seltner in dem von Kystrr, im unteren Planerkalk von Kosstitz und im obern von Kutschlin.

Rosalina marginata was described from Czech Republic sequences by Reuss (1845) as having umbilical “small deep sutures” (English translation from German by Neagu, 2012), but the three type specimens were poorly illustrated and lack lateral views (here re-illustrated in Fig. 7, 5-7). Later, Reuss (1854) found the same species in Austria and clarified marginata species concept by re-describing the species and by illustrating three views of a specimen clearly having radial and depressed sutures on the umbilical side and two closely spaced keels (here re-illustrated in Fig. 7, 3A-C). Unfortunately, the emended description of marginata by Reuss (1854) was mainly overlooked in the literature and the species was largely misidentified (Neagu, 2012). Further confusion was introduced by Jirova (1956) who selected a neotype of marginata having distinct U-shaped keeled sutures on the umbilical side (Fig. 7, 4A-C) out of an assemblage from the type locality while, in the same year, Hofker (1956) erected marginata Reuss as the type species of the genus Marginotruncana. Although the morphological features shown by the neotype are substantially different from the type material of marginata selected by Reuss, (see Pessagno, 1967), the former species concept has been widely accepted in the literature (see Robaszynski et al., 1979). In 2012, Neagu remarked on the morphological differences between the type species, as emended by Reuss (1854) and Jirova's neotype, and assigned the species marginata to the genus Dicarinella Porthault (1970) according to the presence of depressed sutures on the umbilical side. Consequently, Neagu (2012) erected the new species pseudomarginata for Jirova's neotype and assigned it to the genus Marginotruncana on the basis of the umbilical keeled U-shaped sutures. [Falzoni et al. 2016]

References:

Falzoni, F., Petrizzo, M. R., Jenkyns, H. C., Gale, A. S. & Tsikos, H. (2016). Planktonic foraminiferal biostratigraphy and assemblage composition across the Cenomanian–Turonian boundary interval at Clot Chevalier (Vocontian Basin, SE France). Cretaceous Research. 59: 69-97. gs

Hofker, J. (1956a). Die Globotruncanen von Nordwest-Deutshland und Holland. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 103: 312-340. gs

Jirova, D. (1956). The genus Globotruncana in Upper Turonian and Emscherian of Bohemia. Acta Universitatis Carolinae Geologica. 2: 239-255. gs

Neagu, T. (2012). “Rosalina” marginata Reuss 1845 (Foraminifera) and its taxonomic position. Studia UBB Geologia. 57: 35-38. gs

Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs V O

Reuss, A. E. (1845a). Die Versteinerungen der böhmischen Kreide-formation. E. Schweizebart, Stuttgart. 1-58. gs V O

Reuss, A. E. (1854). Beitrage zur Charakteristik der Kreideschichten in den Ostalpen, besonders im Gosauthale und am Wolfgangsee. Denkschriften der kaiserlichen Akademie der Wissenschaften zu Wien. 7: 1-156. gs V O

CATALOG OF ORIGINAL DESCRIPTIONS: Rosalina marginata Reuss 1845

Rosalina marginata

References:

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