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Description
Hallopus victor (whose name means "leaping foot" with "winner" mixed in there -- Marsh wasn't the most brilliant nomenclator, although the name itself is very elegant to see, it's less meaningful in the details) was a fossil crocodilian from the Late Jurassic Morrison Formation.

Hallopus has historically been considered a dinosaur, and was originally named as a species of the now dubious "hypsilophodontan" Nanosaurus, as Nanosaurus victor before Marsh had the idea to look at its ankle; today, we know this ankle qualifies the animal as a crocodilian, and a few decades ago the form of the wrist and tibia suggested the material belonged to a grade of crocs called "sphenosuchians."

Hallopus is very similar to, and possibly synonymous with, Macelognathus ([link] ) from the same formation.

Description
Hallopus victor (whose name means "leaping foot" with "winner" mixed in there -- Marsh wasn't the most brilliant nomenclator, although the name itself is very elegant to see, it's less meaningful in the details) was a fossil crocodilian from the Late Jurassic Morrison Formation.

Hallopus has historically been considered a dinosaur, and was originally named as a species of the now dubious "hypsilophodontan" Nanosaurus, as Nanosaurus victor before Marsh had the idea to look at its ankle; today, we know this ankle qualifies the animal as a crocodilian, and a few decades ago the form of the wrist and tibia suggested the material belonged to a grade of crocs called "sphenosuchians."

Hallopus is very similar to, and possibly synonymous with, Macelognathus ([link] ) from the same formation.