Montanazhdarcho

Source: Wikipedia, the free encyclopedia.

Montanazhdarcho
Temporal range:
Ma
Reconstructed skeletons
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Order: Pterosauria
Suborder: Pterodactyloidea
Clade: Azhdarchoidea
Genus: Montanazhdarcho
Padian, de Ricqlès & Horner, 1995
Type species
Montanazhdarcho minor
Padian, Ricqlès & Horner, 1995

Montanazhdarcho is a

azhdarchoid pterosaur from the Late Cretaceous period (Campanian stage) of what is now the state of Montana, United States
. Montanazhdarcho is known from only one species, M. minor.

Discovery

Holotype pectoral girdle and left forelimb

The

Blackfoot, in sandstone of the Upper Two Medicine Formation, a layer about 74 million years old. The genus name Montanazhdarcho was first given informally in 1993 by Kevin Padian, Armand de Ricqlès, and Jack Horner.[1] It was then named formally in 1995 by the same researchers,[2] and was fully described in 2002.[3]

The type species is Montanazhdarcho minor. The generic name refers to the state of Montana and to the related species Azhdarcho. The specific name means "the smaller one" in Latin, a reference to the relatively small size in comparison to closely related forms.

Description

Montanazhdarcho was a relatively small pterosaur, reaching 2.5 m (8.2 ft) in wingspan.[4] The fossil is largely uncompressed and that of an adult exemplar, as established by a study of the bone by de Ricqlès. It consists of a partial left wing, lacking the outer three wing finger phalanges, a complete shoulder girdle, a crushed cervical vertebra and two fragments of the symphysis of the mandible. The jaws were edentulous, i.e. they lacked teeth.[1][2]

Classification

Location of the discovery of Montanazhdarcho (top; USA)

Montanazhdarcho was by the authors assigned to the

basalmost position.[4]
Their phylogenetic analysis is shown below:

Azhdarchidae

See also

References

  1. ^ a b Padian, K.; Horner, J.R.; de Ricqlès, A.J (1993). "A new azhdarchid pterosaur from the Two Medicine Formation (Late Cretaceous, Campanian) of Montana, identified on the basis of bone histology". Journal of Vertebrate Paleontology. 13: 52A.
  2. ^
    S2CID 132120904
    .
  3. ^ McGowen, M.R.; Padian, K.; de Sosa, M.A.; Harmon, R.J. (2002). "Description of Montanazhdarcho minor, an azhdarchid pterosaur from the Two Medicine Formation (Campanian) of Montana". PaleoBios. 22 (1): 1–9.
  4. ^
    PMID 29534059
    .
  5. ^ Carroll, Nathan (2015). "Reassignment of Montanazhdarcho minor as a non-azhdarchid member of the Azhdarchoidea". Journal of Vertebrate Paleontology. 35: 104.