First record of the genus Trichites (Mollusca, Bivalvia) from the Upper Jurassic (Kimmeridgian) of Santiago Coatepec, Puebla, Mexico

  • Gloria Alencáster
  • Lourdes Omaña
  • Celestina González-Arreola
  • Delfino Hernández-Láscares
Keywords: Trichites, bivalve, larger foraminifers, Upper Jurassic, Mexico


This article proves the presence of the bivalve of the genus Trichites in the Upper Jurassic of Santiago Coatepec, a small area located at the southeast of the state of Puebla, Mexico, and describes a new species, Trichites pueblaensis. This is also the first Upper Jurassic record of the genus for the American continent. The associated larger foraminifera indicate a Kimmeridgian age for this sedimentary sequence. Other important aspect is that during about two centuries it was supposed that the genus Trichites did not exist in the American continent. However, in this article is shown that this assumption was wrong, because the genus has been reported from some places of the western hemisphere.