Halszkaraptorinae

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Halszkaraptorinae
Temporal range: Late Cretaceous,
75–70 Ma
Halszkaraptor escuilliei.jpg
Holotype specimen of Halszkaraptor escuilliei.
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Saurischia
Suborder: Theropoda
Family: Dromaeosauridae
Subfamily: Halszkaraptorinae
Cau et al., 2017
Type genus
Halszkaraptor escuilliei
Cau et al., 2017
Genera

Halszkaraptorinae is a basal ("primitive") subfamily of Dromaeosauridae that includes the enigmatic genera Halszkaraptor, Mahakala, and Hulsanpes. A comparison of the fossils of Halszkaraptor with the bones of extant crocodilians and aquatic birds revealed evidence of a semiaquatic lifestyle.[1] The group is named after Polish paleontologist Halszka Osmólska.[2]

Description[edit]

Halszkaraptorinae is defined as the most inclusive clade that contains Halszkaraptor escuilliei but not Dromaeosaurus albertensis, Unenlagia comahuensis, Saurornithoides mongoliensis or Vultur gryphus. The subfamily is diagnosed by their long necks, proximal caudal vertebrae with oriented articular processes (projections of the vertebra fits with an adjacent vertebra) and prominent zygodiapophyseal laminae (plates of bone that form the posterior walls of each vertebra), a flattened ulna with a sharp posterior margin, ilium with a shelf-like supratrochanteric (above the trochanter of the femur) process, metacarpal III shaft transversely as thick as that of metacarpal II, a posterodistal surface on the femoral shaft with an elongate fossa bound by a lateral crest and the proximal half of metatarsal III being unconstricted and markedly convex anteriorly.[1]

Classification[edit]

The cladogram below is based on the phylogenetic analysis conducted in 2017 by Cau et al. using updated data from the Theropod Working Group in their description of Halszkaraptor.[1]

Dromaeosauridae
Halszkaraptorinae

Halszkaraptor Halszkaraptor reconstruction by Tom Parker.png

Mahakala

Hulsanpes

Unenlagiinae Austroraptor Reconstruction.jpg

Shanag Shanag.jpg

Zhenyuanlong Zhenyuanlong life restoration (white background).jpg

Microraptoria Microraptor Restoration.png

Eudromaeosauria

Bambiraptor

Tianyuraptor

Dromaeosaurinae Utahraptor Restoration (flipped).png

Velociraptorinae Fred Wierum Velociraptor.png

References[edit]

  1. ^ a b c 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. doi:10.1038/nature24679. 
  2. ^ Greshko, Michael (6 December 2017). "Duck-Like Dinosaur Is Among Oddest Fossils Yet Found". National Geographic Society. Retrieved 8 December 2017.