Scientists in Brazil unveil flying reptiles from 90 million years ago
Fossilised pterosaur skeletons at site in Brazil reveal creatures with huge, yacht-like crests
Reuters in Washington
A flying reptile whose head was topped with a big bony crest shaped like the sail of a yacht swooped through the skies over Brazil roughly 90 million years ago.
Scientists have announced the remarkable discovery of about 50 fossilised skeletons of Caiuajara dobruskii, a type of flying reptile known as a pterosaur that lived alongside the dinosaurs, at a site in southern Brazil.
These pterosaurs, whose wingspans measured up to nearly 2.35 metres, inhabited a lakeside oasis in a large desert region during the Cretaceous period, living in vibrant colonies with others of the same species of all ages.
"This helps us to have a glimpse on the anatomical variation achieved by this species from young to old," said Alexander Kellner, a palaeontologist with Brazil's National Museum at the Federal University of Rio de Janeiro, who led the study.
Many pterosaurs boasted elaborate and sometimes large head crests. Caiuajara's head was topped with a big triangular crest that looked like "a bony sail", said Kellner. "It looks bizarre."
There is no indication that the crest was limited to either sex, but Kellner said: "The size of the crest was small in young animals and very large in older ones."
Pterosaurs were earth's first flying vertebrates, with birds and bats making their appearances much later. They thrived from about 220 million years ago to 65 million years ago, when they were wiped out by the asteroid that also doomed the dinosaurs.
The researchers described 47 skeletons in their study published in the scientific journal PLOS ONE and said they have identified 10 more. They said this species lived about 80 to 90 million years ago.
Caiuajara was toothless and most likely a fruit eater.
Pterosaurs' fragile skeletons do not lend well to fossilisation. The sheer number of Caiuajara individuals discovered and their variety of ages have made it one of the best understood pterosaurs ever found, the researchers said.
Chinese scientists in June said they had unearthed 40 adult individuals of another newly identified pterosaur species as well as five pterosaur eggs.