Alcione elainus

Alcione elainus
Temporal range: Upper Maastrichtian
A. elainus FSAC-OB 2 holotype partial skeleton and FSAC-OB 217 metacarpal IV compressed.png
A, humerus of holotype; B, radius and ulna of holotype; C, sternum of holotype; D, referred metacarpal IV; E, metacarpal IV and scapulocoracoid of holotype; F, femur of holotype.
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Order: Pterosauria
Suborder: Pterodactyloidea
Family: Nyctosauridae
Genus: Alcione
Longrich et. al., 2018
Species:
A. elainus
Binomial name
Alcione elainus
Longrich et. al., 2018

Alcione is a nyctosaurid pterosaur from the Ouled Abdoun Basin of Morocco and is from the Maastrichtian of the Upper Cretaceous. Only one species, A. elainus, is known. This pterosaur lived in a marine environment alongside several other pterosaurs, including the nyctosaurids Simurghia and Barbaridactylus.

Description[]

Mandible

Alcione was a small nyctosaurid pterosaur. Its limb proportions were relatively short compared to related pterosaurs. Its anatomy was relatively typical for the group. Its mandible was narrow and Y-shaped (from a dorsal view), and lacked teeth. Instead, it had sharp edges. The scapulocoracoid was fused in the type specimen, which suggests that it was mature. This bone was boomerang-shaped, a condition seen in many nyctosaurids, and to a lesser degree in pteranodontids.[1]

Discovery and naming[]

All known specimens of Alcione were uncovered in a 3-year dig that unearthed about 200 pterosaur specimens. The type specimen, FSAC-OB 2, consists of a partial skeleton that preserves various elements, including the femur, humerus, scapulocoracoid, and sternum. Referred specimens include FSAC-OB 217, which consists of metacarpal IV, FSAC-OB 156, a mandible, and the more complete FSAC-OB 4. This specimen consists of the humerus, radius, ulna, a partial metacarpal IV, phalanx IV-1, scapulocoracoids, and synsacra.[1]

Alcione is named after Alcyone, who was transformed into a seabird, from Greek mythology. The species name, A. elainus, comes from the Greek elaino, which means "to stray or wander."[1]

Classification[]

A phylogenetic analysis by Longrich et. al. uncovered Alcione as a member of Nyctosauridae.

Pteranodon longiceps

Pteranodon sternbergi

Tethydraco

Alamodactylus byrdi

Volgadraco bogolubovi

Cretornis hlavaci

Alcione elainus

Simurghia robusta

Muzquizopteryx coahuilensis

Barbaridactylus grandis

Nyctosaurus lamegoi

Nyctosaurus nanus

Nyctosaurus gracilis

Paleobiology[]

Right humerus

The shorter wings of Alcione suggest that it was better adapted for rapid flapping during flight than other nyctosaurids. An alternative explanation is that this adaptation was to aid with underwater movement, as shortened wings are present in modern piscivorous birds.[1]

Paleoecology[]

Partial right wing

Alcione was discovered in upper Maastrichtian phosphates located in the Ouled Abdoun Basin of Northern Morocco. This geological formation does not belong to a formation. It is divided into couches, with Alcione being discovered in Couche III. This layer dates back to the latest Maastrichtian, about 1 million years before the extinction event at the end of the Cretaceous. Couche III represents the most diverse marine ecosystem known from the time.[1]

A large variety of marine life is known from the region, including sharks and bony fish, in addition to turtles, plesiosaurs, and mosasaurs. A few rare, fragmentary dinosaur fossils are known, including an abelisaur and a sauropod. Other pterosaurs in the formation were originally only represented by the azhdarcid Phosphatodraco mauritanicus. However, in addition to Alcione, more recent studies have revealed at least five more pterosaur species from this location, including Barbaridactylus, Simurghia, and Tethydraco.[1]

References[]

  1. ^ a b c d e f Nicholas R. Longrich; David M. Martill; Brian Andres (2018). "Late Maastrichtian pterosaurs from North Africa and mass extinction of Pterosauria at the Cretaceous-Paleogene boundary". PLOS Biology. 16 (3): e2001663.