Piksi

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Piksi
Temporal range:
Ma
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Order: Pterosauria
Suborder: Pterodactyloidea
Genus: Piksi
Varricchio, 2002
Species:
P. barbarulna
Binomial name
Piksi barbarulna
Varricchio, 2002

Piksi is a potential

monotypic
at present.

The fossils were found in 1991 by

Glacier County. Recovered from an old stratum of the upper Two Medicine Formation, they are probably from an individual that died in or near a small pool. It was described in 2002 by David J. Varricchio
.

Description and classification

The bones are fragmentary and represent roughly the elbow area. Comparing the fossils' size to the wing bones of other ground birds, P. barbarulna would have been relatively small, with a wingspan reaching 1 m (3.3 ft).[1]

The original description of the fossils found its affinities unresolvable except that it was probably an ornithothoracine bird. Agnolin and Varricchio (2012) reinterpreted Piksi barbarulna as a pterosaur rather than a bird, most likely a member of Ornithocheiroidea.[3] However, it has since been noted that the humerus of Piksi possesses features which found in some theropods but not in any pterodactyloid pterosaurs.[4]

However, more recent studies have recovered it as a pterosaur again.[1]

Ecology

The deposit in which the bones were found was a

claystone. This was formed from sediments deposited during what seems to have been a rather cool phase of the Late Cretaceous:[5] sea levels of the Western Interior Seaway at least were apparently very low for Mesozoic standards, though this may also have been due to strong tectonic uplift in the Cordilleran Overthrust Belt
. The location was inland, with the Western Interior Seaway's coast at least 350 km (220 miles) away.

Judging from the

]

A diverse fauna utilized the location as a

multituberculates – occurred in the area, as well as lizards. That there was a temporary though not permanent body of water is indicated by the presence of articulated frog skeletons and the absence of fish and other aquatic animals.[citation needed
]

See also

References

  1. ^
  2. ^ (Varricchio 2002)
  3. S2CID 56002643
    .
  4. .
  5. ^ Though still much warmer than today: see Cretaceous for contemporary climate.

Sources

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