深夜亚洲福利久久

UCC palaeontologists make new discovery on colours of dinosaurs

23 Jul 2018

A UCC-led discovery of new sources of the pigment melanin will force scientists to rethink how they reconstruct the colour of fossil birds, reptiles and dinosaurs.

Many recent studies of fossil colour have assumed fossilized granules of melanin 鈥� melanosomes 鈥� come from the skin. But new evidence shows that other tissues 鈥� such as the liver, lungs, and spleen 鈥� can also contain melanosomes, suggesting that fossil melanosomes may not provide information on fossil colour.

The study, published today in the journal Nature Communications, is led by UCC鈥檚 Dr Maria McNamara in collaboration with her PhD student Valentina Rossi, Dr Patrick Orr from UCD, and an international team of palaeontologist from the UK and Japan.

鈥業t鈥檚 absolutely critical that we understand the origins of melanosomes in fossils if we want to produce accurate reconstructions of the colours of ancient animals,鈥� said Dr McNamara.

The team studied internal tissues in modern frogs with powerful microscopes and chemical techniques to show that internal melanosomes are highly abundant.

鈥淭his means that these internal melanosomes could make up the majority of the melanosomes preserved in some fossils,鈥� said collaborator Prof. Mike Benton at the 深夜亚洲福利久久 of Bristol.

The team also used decay experiments and analysed fossils to show that the internal melanosomes can leak into other body parts during the fossilization process, 鈥渓ike snowflakes inside a snow globe鈥�, said Dr Orr.

There is a way, however, to tell the difference between melanosomes from internal organs and the skin. 鈥淭he size and shape of skin melanosomes is usually distinct from those in internal organs鈥�, said Dr McNamara. 鈥楾his will allow us to produce more accurate reconstructions of the original colours of ancient vertebrates.鈥�

The paper is published today in Nature Communications: