Dinosaur Institute - Diversity and Evolution of Extinct Archosaurs | Natural History Museum of Los Angeles

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Diversity and Evolution of Extinct Archosaurs

Our investigations of the diversity and evolution of extinct archosaurs (crocodiles and kin, pterosaurs, dinosaurs, and a host of early Mesozoic lineages) have focused on expanding our understanding of the physical transformations, diversity, and genealogical relationships of these reptiles during their long evolutionary history. Excluding research on dinosaurs, these investigations have included studies of Mesozoic fossils of primitive crocodilians and their predecessors, as well as research on South American pterosaurs—in particular, the peculiar filter-feeding pterodactyl Pterodaustro from the Cretaceous of central Argentina. The picture above is an inch-long snout of an early crocodile with complex teeth.


1988. Chiappe, L. M. Un nuevo Caiman (Crocodylia, Alligatoridae) de la Formación Tremembé (Oligoceno), Estado de Sao Paulo,Brasil, & su significado paleoclimático. Paulacoutiana 1 (3): 49-66.

1988. Chiappe, L. M. A new trematochampsid crocodile from the Early Cretaceous of North-western Patagonia (Argentina). Palaeobiogeographical & phylogenetic implications. Cretaceous Research 9: 379-389.

1991. Gasparini, Z., Chiappe, L. M. & M. Fernandez. A new Senonian peirosaurid (Crocodylia) from Argentina & a synopsis of the South American Cretaceous crocodilians. Journal of Vertebrate Paleontology 11 (3): 316-333.

1996. Chiappe, L. M. & A. Chinsamy. Pterodaustro's true teeth. Nature 379: 211-212. 

1998. Chiappe, L. M., Rivarola, D., Cione, A., Fregenal-Martinez, M., Sozzi, H., Buatois, L., Gallego, O., Laza, J., Romero, E., López-Albarello, A., Buscalioni, A., Marsicano, C., Adamonis, S., Ortega, F., McGehee, S., & O. Di Iorio. Biotic Association & Paleoenvironmental Reconstruction of the "Loma del Pterodaustro" Fossil Site (Lagarcito Formation, Early Cretaceous, San Luis, Argentina). Geobios 31(3): 349-369. 

2000. Chiappe, L. M., Kellner, A. W. A., Rivarola, D., Davila, S., & M. Fox. Cranial morphology of Pterodaustro guinazui (Pterosauria: Pterodactyloidea) from the Early Cretaceous of Argentina. Contributions in Science 483: 1-19.

2004. Codorniu, L. & L. M. Chiappe. Juvenile pterosaurs (Pterodactyloidea: Pterodaustro guinazui) from the Lower Cretaceous of central Argentina Canadian Journal of Earth Science 41(1): 9-18. 

2004. Pol, D., Ji S.-H., Clark, J. M., & L. M. Chiappe. Basal crocodyliforms from the Early Cretaceous Tugulu Group (Xinjiang Province, China), & the phylogenetic position of Edentosuchus. Cretaceous Research 25: 603-622. 

2004. Chiappe, L. M., Codorniú, L., Grellet-Tinner, G., & D. Rivarola. Pterosaurian embryo inside an egg from the Early Cretaceous of Argentina. Nature 432: 571-572. 

2005. Göhlich, U., Chiappe, L. M., Clark, J. M., & H.-D. Sues. The systematic position of the alleged Late Jurassic dinosaur Macelognathus (Crocodylomorpha: Sphenosuchia). Canadian Journal of Earth Sciences 42: 307-321. 

2009. Milan, J & L.M. Chiappe. First American Record of the Jurassic Ichnospecies Deltapodus brodricki and a Review of the Fossil Record of Stegosaurian Foootprints. The Journal of Geology 17:343-348.

2010. Chiappe, L.M., and U.B. Gohlich. Anatomy of Juravenator starki (Theropoda: Coelurosauria) from the Late Jurassic of Germany. N. Jb. Geol. Palaont. Abh. 258/3, 257-296

2012. Butler, R.J., Porro, L.B., Galton, P.m., and L.M. Chiappe. Anatomy and Cranial Functional Morphology of the Small-Boned Dinosaur Fruitadens haagaorum from the Upper Jurassic of the USA. PloS ONE 7(4): e31556.

2013. Codorniu, L., Chiappe, L.M. & Fabricio D. Cid. First Occurrence of Stomach Stones in Pterosaurs. Journal of Vertebrate Paleontology 33(3):647-654.