Zusammenfassung
An der Typ-Lokalität des Littig phosphorite-cobble paraconglomerate an der Basis der Midway group (Dan-Stufe) wurden drei Brachiopoden-Arten aufgefunden. Eine dieser drei Arten, ein hornschaliger inartikulater Brachiopode, hat wahrscheinlich dasselbe Alter wie das Konglomerat. Er wird nach den aufgefundenen Dorsalklappen alsDiscinisca (Discradisca)littigensis n. sp. bestimmt und ist die älteste Art von 4 Disciniscen, die vom Golf, der Atlantischen Küstenebene und der Karibischen Region bekanntgeworden sind.
Es wird vorgeschlagen, zwei neue Subgenera einzuführen:Discinisca s. s. undDiscradisca n. subgen. Die letztere basiert auf der Typen-ArtD. antillarum (D'Orbigny), die rezent von Kuba bis nach Brasilien vorkommt.
Die geographische Verteilung der Gattung in Süd-, Mittel- und Nordamerika und ihr bathymetrischer Bereich werden diskutiert. In beiderlei Hinsicht streuen jedoch die Beobachtungswerte so stark, daß sie sich paläoökologisch nicht auswerten lassen.
Abstract
Three species of brachiopods are found at the type locality of the Littig phosphorite-cobble paraconglomerate at the base of the Midway group (Danian). One of the three, a chitinophosphatic inarticulate brachiopod, is probably contemporaneous with the conglomerate. It is described from upper valves asDiscinisca (Discradisca) littigensis n. sp. and is the oldest of four Disciniscas known from the Gulf and the Atlantic Coastal Plains and the Caribbean region. Two subgenera are proposed:Discinisca s. s. andDiscradisca n. subgen. The latter is based on the type speciesD. antillarum (D'Orbigny), which is found living from Cuba to Brazil. The geographic distribution of the genus in the Americas and its bathymetric range are discussed with the conclusion that both the distribution and the range are too widespread to be useful in paleoecological interpretation.
Résumé
Dans la localité — type du paraconglomérat de Littig à nodules de phosphorite, situé à la base du Midway group (Etage danien), on a trouvé trois espèces de brachiopodes. L'une, un brachiopode inarticulé à coquille cornée, a probablement le même âge que le conglomérat. D'après les valves dorsales trouvées il a été déterminé commeDiscinisca (Discradisca) littigensis n. sp. et constitue l'espèce la plus ancienne des 4 Disciniscées connues du Golfe, du littoral atlantique et de la région des Caraïbes.
Il est proposé d'introduire deux nouveaux sous-genres:Discinisca s. s. etDiscradisca n. subgen. La dernière est basée sur l'espèce-typeD. antillarum (D'Orbigny) qui se rencontre à l'époque récente depuis Cuba jusqu'au Brésil. L'auteur discute la répartition géographique de l'espèce en Amérique méridionale, septentrionale et centrale, ainsi que son milieu bathymétrique. Considérées toutefois sous ce double aspect, les valeurs observées présentent tellement d'écart que l'on ne peut pas en tirer de conclusions au point de vue paléoécologique.
Краткое содержание
Описан новый вид брах иопод — плеченогих —, н айденный в Техасе. Дается их систематик а и географическое распространение. Осв ещаются некоторые вопросы па леоэкологии.
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Herrn Prof. Dr. Dr. h. c.Erich Bederke zum 70. Geburtstag gewidmet.
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Stenzel, H.B. Stratigraphic and paleoecologic significance of a new danian brachiopod species from Texas. Geol Rundsch 54, 619–631 (1965). https://doi.org/10.1007/BF01820747
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DOI: https://doi.org/10.1007/BF01820747