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Longicrusavis
''Longicrusavis'' (meaning "long shin bird" in Latin) is an extinct genus of basal ornithuromorph bird within the family Hongshanornithidae. Remains have been found from the Lower Cretaceous Yixian Formation in Liaoning Province, China.
==Description==
''Longicrusavis'' is known from the holotype specimen PKUP V1069, which consists of shale slab and counter slab. The skeleton is nearly complete and belongs to an adult individual, with carbonized feathers preserved around the head and forelimbs.
Like the closely related genus ''Hongshanornis'', ''Longicrusavis'' has hindlimbs that are very long relative to the forelimbs. ''Longicrusavis'' has a rostrum that is more robust than that of ''Hongshanornis''. The skull is roughly triangular in shape and the orbits, or eye sockets, are large. In lateral view, the dorsal margin of the skull is slightly concave, but not as much as the dorsal margin of the skull of ''Hongshanornis'', where there is an abrupt constriction at the rostrum.
Although no teeth are preserved, they were likely present because there appears to be alveoli, or tooth sockets, in the premaxilla and maxilla. ''Hongshanornis'' also appears to have alveoli, despite being described as toothless when it was first named. No alveoli are found in the mandible, indicating that it was likely edentulous. ''Longicrusavis'' most likely lacked a beak because it does not possess groves and foramina that are indicative beaks in other taxa such as ''Archaeorhynchus''.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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