Hallopus

Hallopus
Temporal range: Late Jurassic,
Hallopus victor skeletal reconstruction
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauria
Clade: Pseudosuchia
Clade: Crocodylomorpha
Family: Hallopodidae
Genus: Hallopus
Marsh, 1881
Type species
Nanosaurus victor
Marsh, 1881
Synonyms
  • Macelognathus vagans? Marsh, 1884
  • Nanosaurus victor Marsh, 1877

Hallopus was a prehistoric reptile, named in 1877 as a species of Nanosaurus and classified as a genus by O. C. Marsh in 1881 from the Late Jurassic Morrison Formation. Today though the animal is thought to be a pseudosuchian more closely related to crocodilians. It was redescribed as a sphenosuchian crocodylomorph in 1970, now thought to be a paraphyletic group. It was a quite small animal, reaching a length of 1 m (3.3 ft) with long and slender limbs. Macelognathus, a similarly slender-proportioned crocodylomorph to Hallopus, may be synonymous with it.

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