Fig 4 - uploaded by Rodrigo A. Otero
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Comparison of mandibular plates of Tithonian species within Ischyodus Egerton, 1843. All in occlusal view. A. Ischyodus quendstedti, MJSN SCR010-1000), Tithonian of Switzerland; right mandibular, mirrored for comparison (modified from Leuzinger et al. 2017). B. Ischyodus townsendi (MHNC.35.444), Tithonian of central Chile; outline of the left mandibular (only visible in basal view) is overlapped in dashed lines for a better understanding of the complete plate outline. C. Ischyodus dutertrei (holotype, specimen number 3402, Musée Boulogne-sur-le-mer, France), KimmeridgianTithonian of France (modified from Sauvage 1896). D. Ischyodus townsendi (holotype, BMNH P474; currently NHMUK 010039966 PV), Tithonian of England (modified from Natural History Museum, London, Data Portal, data.nhm.ac.uk, https://doi.org/10.5519/0002965). Abbreviations: act, accessory tritor; aot, anterior outer tritor; mt, median tritor; pot, posterior outer tritor; syt, symphyseal tritor.
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Citations
... In South America, the oldest record of Holocephali is from the Upper Jurassic (Tithonian) of Chile, with tooth plates referred to Ischyodus towsendi and Ischyodus sp. (Otero et al. 2021). With respect to Argentina the first and also geologically oldest record of a fossil chimaeroid was reported by Florentino Ameghino (1898a), who mentioned in his Sinopsis Geológico-Paleontológica (p. ...
The aim of the present contribution is to review the fossil record of chimaeroids in Argentina. We review previous records from Argentina, including the presence of Cretaceous chimaeroids reported by Ameghino in the 19th century from the Cretaceous of Santa Cruz province. We re-analyse the species Callorhynchus crassus described from the Miocene of Patagonia by Smith Woodward and Withe in the early 20th century. It is here considered as a valid taxon within the genus Ischyodus as I. crassus nov. comb. Ichyodus dolloi is reported for the first time for the Palaeocene of Patagonia, Argentina. We report for the first time in Argentina fossils belonging to Callorhinchus from Holocene deposits in Buenos Aires province. The long temporal range of Holocephali in Argentina (from Late Cretaceous to Holocene) contrasts with the paucity of their fossil record. This indicates that the history of the clade in southern South America is far from well known.
www.zoobank.org/urn:lsid:zoobank.org:pub:2D6C9E8D-6A32-40E8-89A3-98E7D06ED6D3
La presencia de ictiosaurios es conocida en rocas del Jurásico Superior en el norte de Chile, no obstante, hasta ahora no existen identificaciones taxonómicas válidas más precisas para estos hallazgos. En este trabajo presentamos tres nuevos especímenes de ictiosaurios, recuperados desde niveles oxfordianos de
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corresponde a un cráneo parcial de un taxón más pequeño, casi adulto, referible también a un Ophthalmosauridae. Considerando el registro Jurásico conocido de Ophthalmosauridae en el planeta, la presencia de este grupo en el norte de Chile era esperable. Sin embargo, la disparidad morfológica entre los especímenes
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