Unenlagiidae

Unenlagiidae is a proposed family of eumaniraptoran paravians that includes the subfamilies Halszkaraptorinae and Unenlagiinae. While traditionally members of this group have been classified as subfamilies of Dromaeosauridae, since the 2010s there has been subsequent studies that have question their placement. Some have placed unenlagiids as the sister taxon to Avialae,[1][2] while others have placed them as basal deinonychosaurs outside Dromaeosauridae and Troodontidae.[3] Other recent studies supported the traditional placement of Halszkaraptorinae and Unenlagiinae in Dromaeosauridae.[4][5] Fossils of both subfamilies have been found in both Gondwanan and Laurasian deposits. The biology of the group suggests that some members were semiaquatic specialists.[4]

Unenlagiids
Temporal range: Late Cretaceous, 94–70 Ma Possible Early Cretaceous record
Life reconstruction of Austroraptor cabazai
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Clade: Saurischia
Clade: Theropoda
Clade: Eumaniraptora
Family: †Unenlagiidae
Bonaparte, 1999
Type species
†Unenlagia comahuensis
Novas & Puerta, 1997
Subfamilies

References
  1. Federico L. Agnolín and Fernando E. Novas (2013). Avian ancestors. A review of the phylogenetic relationships of the theropods Unenlagiidae, Microraptoria, Anchiornis and Scansoriopterygidae. SpringerBriefs in Earth System Sciences. pp. 1–96. doi:10.1007/978-94-007-5637-3. ISBN 978-94-007-5636-6.
  2. Matías J. Motta; Federico L. Agnolín; Federico Brissón Egli; Fernando E. Novas (2020). "New theropod dinosaur from the Upper Cretaceous of Patagonia sheds light on the paravian radiation in Gondwana". The Science of Nature. 107 (3): Article number 24. doi:10.1007/s00114-020-01682-1.
  3. Hartman, Scott; Mortimer, Mickey; Wahl, William R.; Lomax, Dean R.; Lippincott, Jessica; Lovelace, David M. (2019). "A new paravian dinosaur from the Late Jurassic of North America supports a late acquisition of avian flight". PeerJ. 7: e7247. doi:10.7717/peerj.7247. PMC 6626525. PMID 31333906.
  4. Cau, A.; Beyrand, V.; Voeten, D.; Fernandez, V.; Tafforeau, P.; Stein, K.; Barsbold, R.; Tsogtbaatar, K.; Currie, P.; Godrfroit, P. (6 December 2017). "Synchrotron scanning reveals amphibious ecomorphology in a new clade of bird-like dinosaurs". Nature. 552 (7685): 395–399. doi:10.1038/nature24679. PMID 29211712.
  5. Cau, Andrea (2020-02-25). "The body plan of Halszkaraptor escuilliei (Dinosauria, Theropoda) is not a transitional form along the evolution of dromaeosaurid hypercarnivory". PeerJ. 8: e8672. doi:10.7717/peerj.8672. ISSN 2167-8359. PMC 7047864. PMID 32140312.
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