Pterodactylus specimens can be divided into two distinct year classes.
From the en.wikipedia.org
Pterodactylus, like related pterosaurs, had a crest on its skull composed mainly of soft tissues.
From the en.wikipedia.org
A prolific fossilist, Anning is credited with finding the first plesiosaurus, the first pterodactylus macronyx in Britain and the squaloraja fish fossil.