4
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: not found

      Linguliform brachiopods from the terminal Cambrian and lowest Ordovician of the Oaxaquia microcontinent (Southern Mexico)

      Read this article at

      ScienceOpenPublisher
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Eighteen taxa of linguliform brachiopods, mainly represented by acrotretoids, are reported from the Upper Cambrian (Furongian, Stage 10) and Lower Ordovician (Tremadocian) Tiñu Formation of Oaxaca State, Mexico. At the time of deposition, this area was part of Oaxaquia, which was either a microcontinent or an integral part of the Gondwanan margin. Whereas certain trilobites seem to indicate a Gondwanan affinity, the Tiñu brachiopod faunas show a less definite paleogeographic relationship. Some taxa have previously only been reported from Laurentia ( Eurytreta cf. fillmorensis, Eurytreta cf. campaniformis), and one taxon is best known from the Avalon microcontinent ( Eurytreta cf. sabrinae). However, the relatively high percentage of new and potentially endemic taxa ( Oaxaquiatreta labrifera n. gen. n. sp., Tapuritreta reclinata n. sp., Oaxaquiatreta sp., Eurytreta? n. sp., Acrotretidae n. gen. n. sp., Obolinae gen. and sp. indet.) and the lack of other typical Laurentian, Gondwanan, or Avalonian taxa suggest either a certain degree of insularity of Oaxaquia or reflects a more temperate, unrestricted marine environment during the Early Paleozoic. Other taxa reported from the Tiñu Formation include Semitreta sp., Lingulella? spp., Obolinae gen. and sp. indet., Eoscaphelasma? sp., Ottenbyella? sp. A and sp. B, and Acrotretidae gen. and sp. indet. A, B, and C. Eurytreta and Semitreta are critically reviewed and several taxa previously assigned to them have been excluded. An emended diagnosis for the genus Eurytreta is presented. The presence of delthyrium and notothyrium-like structures in the siphonotretid Oaxaquiatreta n. gen. further strengthens the previously proposed relationship between the Siphonotretida and Paterinida.

          Related collections

          Most cited references37

          • Record: found
          • Abstract: not found
          • Article: not found

          Palaeontological evidence bearing on global Ordovician–Silurian continental reconstructions

            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            A Supra-Ordinal Classification of the Brachiopoda

              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Terranes of Mexico Revisited: A 1.3 Billion year Odyssey

              J. Keppie (2004)
                Bookmark

                Author and article information

                Journal
                applab
                Journal of Paleontology
                J. Paleontol.
                Paleontological Society
                0022-3360
                1937-2337
                January 2011
                July 14 2015
                : 85
                : 01
                : 122-155
                Article
                10.1666/10-074.1
                9e96d3fe-0af3-4886-8165-742addbb13de
                © 2015
                History

                Comments

                Comment on this article