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Fossil Record A palaeontological open-access journal of the Museum für Naturkunde
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Volume 19, issue 2
Foss. Rec., 19, 101-117, 2016
https://doi.org/10.5194/fr-19-101-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Foss. Rec., 19, 101-117, 2016
https://doi.org/10.5194/fr-19-101-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 15 Apr 2016

Research article | 15 Apr 2016

Actinistian gular plates from the Cretaceous of Mexico and the problems assigning gular plates taxonomically

Hans-Peter Schultze1 and Katia Adriana González-Rodríguez2 Hans-Peter Schultze and Katia Adriana González-Rodríguez
  • 1University of Kansas, Natural History Museum and Biodiversity Institute, Lawrence, Kansas, USA
  • 2Instituto de Ciencias Básicas e Ingeniería, Museo de Paleontología, Centro de Investigaciones Biológicas, Universidad Autónoma del Estado de Hidalgo, Mineral de la Reforma, Hidalgo, Mexico

Abstract. Two gular plates of an indeterminate actinistian are described from the Cretaceous of Muhi quarry, Hidalgo state, in central Mexico. Their narrow shape belongs to the few actinistian gular plates with a high length/width ratio (above 4) in contrast to most known actinistian gular plates with a length/width ratio below 4. The gulars of Muhi quarry are assigned, with caution, to the actinistian family Mawsoniidae on the basis of the length/width ratio (around 4.5) of the gular, which can be found in three other genera of the family. There are not enough characteristics in actinistian gular plates alone to erect a new genus or species. Noteworthy is the large size of the Muhi gulars that corresponds to a body length of about 1.6m – the length of Latimeria today. The gulars are preserved in association with a basibranchial tooth plate and a few neural spines. This is the third actinistian record from the Cretaceous of Mexico.

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