Hallopus

Hallopus Temporal range: Late Jurassic, 155.7–145.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Hallopus victor front and hind limb
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Family:	†Hallopodidae
Genus:	†Hallopus Marsh, 1881
Type species
†Hallopus 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 by O. C. Marsh in 1881 from the Late Jurassic Morrison Formation, originally as a dinosaur,^[1] though the animal is now thought to be a pseudosuchian more closely related to crocodilians. It was a quite small animal, reaching a length of 1 m (3.3 ft).^[2] It was redescribed as a sphenosuchian crocodylomorph.^[3] Later, it was speculated to be more derived than Sphenosuchus and near or within the Junggarsuchus + Crocodyliformes node.^[4]

Phylogeny[]

A recent phylogenetic analysis^[5] recovered Hallopus in a clade with Macelognathus and Almadasuchus, the Hallopodidae (defined as "all taxa more closely related to Hallopus victor than to Protosuchus richardsoni or Dibothrosuchus elaphros). The Hallopodidae was recovered as the nearest sister to the Crocodyliformes and more derived than Junggarsuchus or the "sphenosuchians" whose monophyly was not supported in this analysis.

Similarly, in redescribing Macelognathus from the Morrison Formation, Göhlich et al. (2005)^[6] recognized several anatomical similarities between Macelognathus and Hallopus while also noting if the provenance of the latter was correct, they would overlap stratigraphically.

Restoration

Skeletal restoration

References[]

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