A new trematochampsid crocodile from the Early Cretaceous of north-western Patagonia,Argentina and its palaeobiogeographical and phylogenetic implications |
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| Institution: | 1. Honors College, University of New Mexico, Albuquerque, NM 87131, United States;2. Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, 87131, United States;3. Facultad de Ciencias, Universidad de la Republica, 11400 Montevideo, Uruguay |
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| Abstract: | Amargasuchus minor is described from the Early Cretaceous (Neocomian, of the La Amarga Formation of northwest Patagonia (Argentina). This species possesses a moderately high and narrow snout, strong festooning, a relatively large number of maxillary teeth and a well developed antorbital fenestra, and it lacks hypertrophied teeth, a combination of characters which suggests that it belongs to the crocodile family Trematochampsidae. Amargasuchus differs, however, from Trematochampsa in several respects. These include an almost straight lateral edge of the maxilla in dorsal aspect, a different distribution of the largest teeth, a longer snout, and laterally compressed alveoli. The new material supports a Gondwanan origin of the Trematochampsidae and agrees with a new phylogenetic hypothesis which considers trematochampsids to be the ancestral group of certain lineages of ziphodont mesosuschian crocodiles. |
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