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Parasuchidae is a clade of more derived than Diandongosuchus, a basal phytosaur. This family was phylogenetically defined by Christian Kammerer and colleagues in 2015 as the last common ancestor and all descendants of Wannia, Parasuchus, and Mystriosuchus. It encompasses nearly all phytosaurs, including early Parasuchus-grade forms as well as a more restricted clade of more specialized phytosaurs. This more restricted clade is traditionally known as the family Phytosauridae and more recently as the subfamily Mystriosuchinae, defined by Kammerer et al. 2015 as the last common ancestor and all descendants of Mystriosuchus and Angistorhinus.
Parasuchids have been recovered from Late Triassic deposits in Europe, North America, India, Morocco, Thailand, Brazil, GreenlandMateus, O., Clemmensen L., Klein N., Wings O., Frobøse N., Milàn J., Adolfssen J., & Estrup E. (2014). The Late Triassic of Jameson Land revisited: new vertebrate findings and the first phytosaur from Greenland. Journal of Vertebrate Paleontology. Program and Abstracts, 2014, 182. and Madagascar. In their osteology of Parasuchus, Kammerer et al. (2016) suggested using Parasuchidae to include taxa traditionally included in Phytosauridae as well as Parasuchus-grade taxa.Kammerer, C. F., Butler, R. J., Bandyopadhyay, S., Stocker, M. R. (2016), Relationships of the Indian phytosaur Parasuchus hislopi Lydekker, 1885. Papers in Palaeontology, 2: 1–23. doi: 10.1002/spp2.1022 Stocker et al. (2017) use the phytosaur classification advocated by Kammerer et al. (2016) by recovering Diandongosuchus as the basalmost phytosaur outside Parasuchidae, noting that Diandongosuchus has a shorter snout than parasuchids.Michelle R. Stocker; Li-Jun Zhao; Sterling J. Nesbitt; Xiao-Chun Wu; Chun Li (2017). "A Short-Snouted, Middle Triassic Phytosaur and its Implications for the Morphological Evolution and Biogeography of Phytosauria". Scientific Reports. 7: Article number 46028. doi:10.1038/srep46028.
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