Wikipedia
Cretornis is a pterosaur genus containing the single species Cretornis hlavaci. It is known from a complete three inch long humerus (upper arm bone) and other wing bones found in late Cretaceous period ( Turonian) rocks from Czech Republic, dating to about 92 million years ago. Based on comparison with its relatives, the wingspan of C. hlavaci has been estimated at .
The specimen was found by the pharmacist Hlaváč at Zářecká Lhota near the town of Choceň in 1880. In 1881, the Czech naturalist Antonín Frič named it as the type species Cretornis Hlaváči. The generic name is derived from Latin creta, "chalk", in reference to the Cretaceous, and Greek ὄρνις, ornis, "bird", as Frič thought the bones belonged to some ancient bird. The specific name honours Hlaváč. Afterwards it was realised that the find represented some pterosaur. The name was incorrectly emended by Richard Lydekker into Ornithochirus hlavatschi in 1888.