specific name thambema is derived from the Greek for 'terror, monster' (τό θάμβημα, -ήματος), in reference to its huge size. New specimens of Hatzegopteryx have since been recovered from other localities. In the Sânpetru Formation from the locality of Vadu, Sântămăria-Orlea, a medium-sized scapulocoracoid was found, which probably pertained to an individual with a wingspan of . From the Râpa Roșie locality of the Sebeș Formation, which is contemporary and adjacent to the Densuș Ciula Formation, a single large neck vertebra, the "RR specimen" or EME 215, was found. Although the lack of overlapping elements prevents this specimen from being definitely referred to Hatzegopteryx thambema, its distinctive internal bone structure, as well as the lack of evidence for a second giant azhdarchid in the area, warrant its referral to at least H. sp. Description Skull The skull of Hatzegopteryx was gigantic, with an initially estimated length of based on comparisons with Nyctosaurus and Anhanguera, making it one of the largest skulls among non-marine animals. The skull was broadened in the rear, being wide across the quadrate bones. While most pterosaur skulls are composed of gracile plates and struts, in Hatzegopteryx the skull bones are stout and robust, with large ridges indicating strong muscular attachments. In 2018, Mátyás Vremir concluded that Hatzegopteryx likely had a shorter and broader skull, the length of which he estimated at . The massive jaw bore a distinctive groove at its point of articulation (also seen in some other pterosaurs, including Pteranodon) that would have allowed the animal to achieve a very wide gape. Unpublished remains attributed to Hatzegopteryx suggest that it had a proportionally short, deep beak, grouping with the "blunt-beaked" azhdarchids rather than the "slender-beaked" azhdarchids (including Quetzalcoatlus sp.). Cervical vertebrae A large neck vertebra attributed to Hatzegopteryx is short and unusually robust. The preserved portion measures long, with the entire vertebra likely measuring long in life. Pterosaurs had nine neck vertebrae; regression indicates that the third to seventh cervical vertebrae would have collectively measured in length, with the longest vertebra - the fifth - only measuring approximately long. Meanwhile, the same vertebrae in the similarly giant Arambourgiania measured ; this indicates that the neck of Hatzegopteryx is about 50–60% the length of what would be expected for a giant azhdarchid of its size. The bottom surface of the neck vertebra was also unusually thick, at . For most other giant azhdarchids, including Arambourgiania,