Temporal range: Upper Maastrichtian
|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.|
Longrich et. al., 2018
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.
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.
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.
A phylogenetic analysis by Longrich et. al. uncovered Alcione as a member of Nyctosauridae.
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.
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.
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.