sentences:  Two fossils from North America formerly thought to have been similar to istiodactylids are now believed to have been misidentified; a mandible fragment from the Morrison Formation probably belongs to another pterosaur group, and "Gwawinapterus" is most likely a fish.The "Istiodactylus" specimen NHMUK R3877 is the most well-preserved istiodactylid skeleton, and some details of the group's anatomy are known only from it.The cladogram below is a topology recovered by Kellner "et al."