Lagosuchus

Lagosuchus; Temporal range: Late Triassic,
	Mounted skeleton (based on specimens previously referred to Marasuchus)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Ornithodira
Clade:	Dinosauromorpha
Order:	†Lagosuchia; Paul, 1988
Family:	†Lagosuchidae; Bonaparte, 1975
Genus:	†Lagosuchus; Romer, 1971
Species:	†L. talampayensis
Binomial name
	†Lagosuchus talampayensis; Romer, 1971
Synonyms
	Marasuchus lilloensis? Sereno & Arcucci, 1994;

Lagosuchus is an extinct genus of avemetatarsalian archosaur from the Late Triassic of Argentina. The type species of Lagosuchus, Lagosuchus talampayensis, is based on a small partial skeleton recovered from the early Carnian-age Chañares Formation. The holotype skeleton of L. talampayensis is fairly fragmentary, but it does possess some traits suggesting that Lagosuchus was a probable dinosauriform, closely related to dinosaurs.^[1]^[2]^[3]

A second potential species of Lagosuchus, L. lilloensis, is based on an assortment of slightly larger and more well-preserved fossils.^[4] These larger specimens have been considered much more diagnostic and informative than the original small L. talampayensis skeleton. As a result, some paleontologists have placed the larger specimens into a new genus, Marasuchus. Marasuchus is generally considered one of the more complete early dinosauriforms, useful for estimating ancestral traits for the origin of dinosaurs. This would also render Lagosuchus a nomen dubium, simply a name referring to a fossil which is too fragmentary to have a formal genus.^[2]^[5] However, other paleontologists support the argument that Lagosuchus is a valid genus, and that Marasuchus is a junior synonym of it.^[6]^[3]

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