Palintropus
| Palintropus | |
|---|---|
| Scientific classification Edit this classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Clade: | Avialae |
| Clade: | †Ambiortiformes |
| Genus: | †Palintropus Brodkorb, 1970 |
| Species: | †P. retusus
|
| Binomial name | |
| †Palintropus retusus (Marsh, 1892)
| |
| Synonyms | |
|
Cimolopteryx retusa Marsh, 1892 | |
Palintropus is a prehistoric bird genus from the Late Cretaceous. A single species has been named (Palintropus retusus) based on a proximal coracoid from the Lance Formation of Wyoming, dated to the latest Maastrichtian, 66 million years ago.[verification needed ] Coracoids and a proximal scapula of two unnamed species from the upper Campanian Dinosaur Park Formation of Alberta, dating to between 76.5 and 75 million years ago,[1] are also known.[2]
Initially it was placed in the wastebin genus "Cimolopteryx". Pierce Brodkorb assigned it its current name, first affiliating it with Apatornis in 1963, and establishing its current genus in 1970.[3]
Its relationships are not well determined, mainly due to the paucity of material. Several major theories have been established: Like many of the birds of the subtropical coastlands of the Western Interior Seaway - maybe a bit like eastern Australia today - it is sometimes believed to be an early member of the Charadriiformes (waders, gulls, auks, etc.; see also "Graculavidae").[3] However, an alternate theory is that it is a galliform, perhaps a quercymegapodiid.[2]
In 2009, Longrich and colleagues proposed that Palintropus is a primitive bird related to Apsaravis . They conducted the first cladistic analysis of the remains, and found this to be the most likely hypothesis, suggesting Palintropus warrants inclusion in the newly established Palintropiformes.[4]
Footnotes
[edit ]- ^ Arbour, V.M.; Burns, M. E.; Sissons, R. L. (2009). "A redescription of the ankylosaurid dinosaur Dyoplosaurus acutosquameus Parks, 1924 (Ornithischia: Ankylosauria) and a revision of the genus". Journal of Vertebrate Paleontology. 29 (4): 1117–1135. Bibcode:2009JVPal..29.1117A. doi:10.1671/039.029.0405. S2CID 85665879.
- ^ a b Hope (2002)
- ^ a b Brodkorb (1970)
- ^ Longrich, N. (2009). "An ornithurine-dominated avifauna from the Belly River Group (Campanian, Upper Cretaceous) of Alberta, Canada." Cretaceous Research, 30(1): 161-177.
References
[edit ]- Brodkorb, P. (1970): The generic position of a Cretaceous bird. Quarterly Journal of the Florida Academy of Science. 32(3), 239–240.
- Hope, Sylvia (2002): The Mesozoic radiation of Neornithes. in Chiappe and Witmer, eds. Mesozoic Birds: Above the Heads of Dinosaurs. 339–388.
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