Piscogavialis

Nephrozoa

Piscogavialis
Temporal range: Miocene
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Crocodylomorpha
Order: Crocodylia
Family: Gavialidae
Subfamily: Gryposuchinae
Genus: Piscogavialis
Kraus, 1998
Species
  • P. jugaliperforatus Kraus, 1998 (type)

Piscogavialis is an extinct genus of gryposuchine gavialid crocodylian. The only species yet known is P. jugaliperforatus. Fossils of Piscogavialis have been found from the Mio-Pliocene Pisco Formation of the Sacaco Basin in southern Peru. It is the first reptile known from the formation, which is otherwise notable for its high diversity of fossil vertebrates.[1]

Piscogavialis is known only from a single specimen, but it represents some of the best preserved gavialid material known from South America. The skull is preserved in three dimensions and is nearly complete. A mandible and some postcranial material have also been found in association with the skull. Several important features of the occipital region of the skull support a referral to the family Gavialidae, which also includes the extant gharial and false gharial.

Paleobiology

The strata from which remains of Piscogavialis have been found suggest that it lived in a coastal environment.[1][2] Another extinct gavialid, Siquisiquesuchus, is also known to have lived in a coastal setting.[3] The presence of other gryposuchines in coastal strata may be an indication that all members of the subfamily inhabited coastal environments.[4][5] However, some gryposuchines have been found from localities that clearly represent non-marine environments.[6]

References

  1. ^ a b Kraus, R. M. (1998). "The cranium of Piscogavialis jugaliperforatus n.gen., n.sp. (Gavialidae, Crocodylia) from the Miocene of Peru". Paläontologische Zeitschrift 72 (3): 389–406. 
  2. ^ Vélez-Juarbe, J.; Brochu, C. A.; and Santos, H. (2007). "A gharial from the Oligocene of Puerto Rico: transoceanic dispersal in the history of a non-marine reptile". Proceedings of the Royal Society B 274 (1615): 1245–1254. doi:10.1098/rspb.2006.0455. PMC 2176176. PMID 17341454. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2176176. 
  3. ^ Brochu, C. A.; and Rincon, A. D. (2004). "A gavialoid crocodylian from the Lower Miocene of Venezuela". Special Papers in Palaeontology 71: 61–78. 
  4. ^ Iturralde-Vinent, M. A.; and MacPhee, R. D. E. (1999). "Paleogeography of the Caribbean region: implications for Cenozoic biogeography". Bulletin of the American Museum of Natural History 238: 1–95. 
  5. ^ Sánchez-Villagra, M. R.; and Aguilera, O. A. (2006). "Neogene vertebrates from Urumaco, Falcón State, Venezuela: diversity and significance". Journal of Systematic Palaeontology 4 (3): 213–220. doi:10.1017/S1477201906001829. 
  6. ^ Kay, R. F.; and Madden, R. H. (1997). "Paleogeography and paleoecology". In R. F. Kay, R. H. Madden, R. L. Cifelli, and J. J. Flynn (eds.). Vertebrate paleontology in the neotropics: the Miocene fauna of La Venta, Colombia. Washington, D. C.: Smithsonian Institution Press. pp. 520–550. ISBN 156098418X. 

External links