others being Zhejiangopterus and Quetzalcoatlus), and was one of the last known pterosaurs. Complete neck vertebral series are rare for azhdarchids, but such vertebrae are some of the most commonly found and best known remains of the group. In 2018 paleontologist Nicholas R. Longrich and colleagues reported pterosaur fossils collected from "couche III" in cooperation with the Moroccan fossil industry the previous three years; until that point, only the single specimen of Phosphatodraco was known from the assemblage. At the time, the collection was the largest and most diverse collection of pterosaurs from the Maastrichtian age of the Late Cretaceous, and included two cervical vertebrae they assigned to Phosphatodraco, based on similarity with the holotype in size and proportions. One of the vertebrae, specimen FSAC-OB 12, was identified as a C5 (though stated in the description to be similar to C6 of the holotype); the other, FSAC-OB 13, was identified only as a cervical vertebra. The cervical ribs (ribs of the neck vertebrae) of FSAC-OB 12 do not appear to have yet fused to the centrum (the main part of the vertebra), so the animal may not have been completely mature. These specimens are housed at Faculté des Sciences Aïn Chock in Casablanca. In 2020 paleontologists Claudio Labita and David M. Martill described an articulated (where the bones are connected as in life) pterosaur wing from "couche III" (specimen FSAC CP 251, bought from fossil dealers), which they assigned to Tethydraco, a genus also described by Longrich and colleagues in 2018 based on a humerus (upper arm bone). Tethydraco was originally considered a pteranodontid, but Labita and Martill concluded it was an azhdarchid, and that it possibly represented the wing elements of Phosphatodraco. They noted that more associated and articulated pterosaur fossils were being collected from these deposits due to improving methods used by fossil diggers, and that azhdarchid fossils were becoming abundant. They also cautioned that the provenance of some of the Moroccan fossils was difficult to establish, due to the commercial nature of their collection. Interpretations of cervical (neck) vertebra order Pereda-Suberbiola and colleagues originally interpreted the five preserved cervical vertebrae of Phosphatodraco as cervicals C5–C9. The frontmost preserved vertebra they interpreted as C5 consisted of two fragments; they found it unlikely that these belonged to two different vertebrae, since they lay in continuity with no sediment in between, and overlapped each other in some areas. They considered