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Ilchunaia
''Ilchunaia'' is an extinct genus of sebecid mesoeucrocodylian. Fossils have been found from the Divisadero Largo Formation of Argentina dating back to the Late Eocene,〔Paolillo, Alfredo; and Linares, Omar J. (2007). Nuevos cocodrilos Sebecosuchia del Cenozoico Suramericano (Mesosuchia: Crocodylia). ''Paleobiologia Neotropical'' 3: 1–25.〕〔Turner, A. H. and Calvo, J. O. (2005). A new sebecosuchian crocodyliform from the Late Cretaceous of Patagonia. ''Journal of Vertebrate Paleontology'' 25(1):87–98.〕 and a locality in Mendoza, Argentina dating back to the Oligocene.〔Rusconi, C. (1946). Ave y reptil oligocenos de Mendoza. ''Bolletín Paleontológico (Buenos Aires)'' 21:1–3.〕〔Langston, W. J. (1956). The Sebecosuchia: cosmopolitan crocodilians? ''American Journal of Science'' 254:605–614.〕 Little material is known from the genus, with only the anterior portion of the skull being present to study (the holotype has since been lost).〔Gasparini, Z., Fernández, M. and Powell, J. (1993). New Tertiary Sebecosuchians (Crocodylomorpha) from South America: Phylogenetic Implications. ''Hististorical Biology'' 7:1-19.〕〔Gasparini, Z. (1972). Los Sebecosuchia (Crocodilia) del territorio argentino. Consideraciones sobre su “status” taxonómico. ''Ameghiniana'' 9(1): 23-34.〕
The placement of ''Ilchunaia'' within Sebecosuchidae has been questioned in the past, and many recent phylogenetic analyses have shown the family to be entirely paraphyletic, with members most likely being basal sebecosuchians ancestral to the baurusuchids.〔Busbey III, A. B. (1986). New material of ''Sebecus cf. huilensis'' (Crocodilia: Sebecosuchia) from the Miocene La Venta Formation of Colombia. ''Journal of Vertebrate Paleontology'' 6(1):20-27.〕〔Gasparini, Z., Fernández, M. and Powell, J. (1993). New Tertiary Sebecosuchians (Crocodylomorpha) from South America: Phylogenetic Implications. ''Hististorical Biology'' 7:1-19.〕〔Ortega, F., Buscalioni, A. D. and Gasparini, Z. (1996). Reinterpretation and new denomination of ''Atacisaurus crassiporatus'' (Middle Eocene; Issel, France) as ''cf. Iberosuchus'' (Crocodylomorpha, Metasuchia). ''Geobios'' 29:353–364.〕〔Ortega, F., Gasparini, Z., Buscalioni, A. D., and Calvo, J. O. (2000). A new species of ''Araripesuchus'' (Crocodylomorpha, Mesoeucrocodylia) from the Lower Cretaceous of Patagonia (Argentina). ''Journal of Vertebrate Paleontology'' 20:57–76.〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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