The Cenomanian short snout enchodontid fishes (Aulopifomes,Enchodontidae) from Sierra Madre Formation,Chiapas, southeastern Mexico |
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| Institution: | 1. Museo de Paleontología “Eliseo Palacios Aguilera”, Secretaría de Medio Ambiente e Historia Natural., Calzada de Los Hombres Ilustres s/n., Tuxtla Gutiérrez, Chiapas, Mexico;2. Instituto de Geología, Universidad Nacional Autónoma de México; Circuito de la Investigación S/N, Ciudad Universitaria, Coyoacán, D.F., 04510, Mexico;1. Departamento de Paleontología, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, D. F., C.P. 04510, Mexico;2. Departamento de Zoologia, Instituto de Biologia, Universidade do Estado do Rio de Janeiro, São Francisco Xavier 524, Maracanã, Rio de Janeiro, 20559-900, Brazil;3. Museo de Paleontología de Múzquiz, Adolfo E. Romo Pte. s/n. Col. La Cascada, Melchor Múzquiz, Coahuila, 26340, Mexico;4. Posgrado en Ciencias Biológicas, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, D. F., C.P. 04510, Mexico;1. Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, CdMx 04510, Mexico;2. Muséum National d’Histoire Naturelle, Paris, Département Origines & Évolution, UMR 7207 CR2P CNRS-MNHN-UPMC, case postale 38, 8 rue Buffon, Paris, F-75005, France;3. Museo de Paleontología “Eliseo Palacios Aguilera”, Secretaría de Medio Ambiente e Historia Natural, Tuxtla Gutiérrez, Chiapas, Mexico;4. Laboratório de Paleontologia, Faculdade de Geologia, Instituto de Geociências, Universidade Federal do Pará, Caixa Postal 1611, CEP 66075-110, Belém, Pará, Brazil;5. Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, CdMx 04510, Mexico;6. 8 Impasse de San Marino, 31140 Pechbonnieu, France;7. Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, CdMx 04510, Mexico;1. Department of Environmental Science and Studies and Department of Biological Sciences, DePaul University, 2325 North Clifton Avenue, Chicago, IL 60614, USA;2. Sternberg Museum of Natural History, Fort Hays State University, 3000 Sternberg Drive, Hays, KS 67601, USA;1. Departamento de Zoologia, Instituto de Biologia, Universidade do Estado do Rio de Janeiro, rua São Francisco Xavier, 524, Rio de Janeiro, 20559-900, Brazil;2. School of Earth and Planetary Sciences, Birkbeck College, Malet Street, London, WC1E 7HX, UK;3. Instituto de Geología, Universidad Nacional Autónoma de México, Circuito de la Investigación S/N, Ciudad Uniersitaria, Delegación Coyoacán, Ciudad de México, 04510, Mexico;1. Departament de Geologia, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain;2. Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico;3. Facultad de Ingeniería, Universidad Autónoma de Chihuahua, Campus II, 31125 Chihuahua, Mexico;4. Secretaría del Medio Ambiente e Historia Natural (SEMAHN) and Instituto de Ciencias Biológicas de la Universidad de Ciencias y Artes de Chiapas (UNICACH), 29000 Tuxtla Gutiérrez, Chiapas, Mexico |
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| Abstract: | In this paper the short snout Cenomanian enchodontids from the El Chango quarry, Chiapas, southeastern Mexico, are reviewed. Unicachichthys multidentata nov. gen. and sp. is named and identified as a new member of the Enchodontidae because it has the predorsal scute series that is the distinctive character of such family. This new genus resembles other short snout enchodontids, as Enchodus and Eurypholis; however, Unicachichthys differs from these and other members of the family because it shows characters ever observed, including a multitoothed dermopalatine, the presence of a basal sclerotic bone, and the serrations in the posterior edge of the preopercle vertical limb. The inclusion of Unicachichthys in two phylogenetic analyses, based on studies previously performed, suggests that this is a primitive representative of the family Enchodontidae. Additionally specimens of two different species of Enchodus from the El Chango quarry are also described; these specimens are so scarce and fragmentary that it is not possible to determine their specific taxonomic identity. The record of these Mexican fossils enrich the knowledge about the diversity of Cenomanian enchodontids in the North American domain of the Tethys Sea, which now contains new taxa that should be considered in future efforts to recognize the phylogenetic and biogeographic processes experienced by this fish group. |
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| Keywords: | Upper Cretaceous El Chango Cintalapa Member |
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