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
Received: 07 Jan 2016 – Revised: 22 Feb 2016 – Accepted: 03 Mar 2016 – Published: 15 Apr 2016
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 1.6 m – 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.
Schultze, H.-P. and González-Rodríguez, K. A.: Actinistian gular plates from the Cretaceous of Mexico and the problems assigning gular plates taxonomically, Foss. Rec., 19, 101-117, doi:10.5194/fr-19-101-2016, 2016.