Researchers reveal crab’s-eye view of the ancient world

The fossil crab Callichimaera perplexa. Credit: Daniel Ocampo R. / Vencejo Films.

Their legs get more Attention May, a new study says ond and crab’s eyes oes Faint roof equipment, too – o leiaf scientifically.

Writing in the journal iScience, paleontologists from Yale and Harvard have discovered new, unusually large optical features from a 95-million-year-old crab fossil, Callichimaera perplexa.

Javier Luque paleontologist Javier Luque – who suggests that Callichimaera was a predator.

Callichimaera, which was found in Boyacá, Colombia, and Wyoming, in the United States, was about the size of a quarter, featuring large compound eyes with no sockets, bent claws, leg-like mouth parts, the exposed tail, and a long body.

Previous research has shown that the extinction of sea scorpions more than 250 million years ago.

“The specimens we have of the unusual Cretaceous crab Callichimaera perplexa preserve some very delicate eye tissues that don’t normally preserve,” said Kelsey Jenkins, a Yale graduate and planetary sciences student at Yale and the new study’s first author.

“This includes Things like facets and optical mewnol tissues. This kind of excellent preservation is rare. ”

The co-author of the study Corresponding lower Luque, WHO sub Now a research associate at Harvard. The study’s co-author is Derek Briggs, the G. Evelyn Hutchinson Professor of Earth & Planetary Sciences at Yale’s Faculty of Arts and Sciences.

Briggs invertebrate paleontology sub ALSO curator of the Yale Peabody Museum of at Natural History.

For the study, the researchers analyzed nearly 1,000 living Crabs and fossils, Different Stages of cynnwys Crabs for Development, Representing 15 crab species. The size of the researchers Compared the Crabs ‘eyes and sut fast they’ grew.

Callichimaera topped the list in hub categories. Its eyes were about 16% of-its body size.

“I’m 5’2″. Os my eyes were this big, and what little they ”d over 9 inches in diameter, “Jenkins Said. “If Something has eyes this big, they ” re Definitely iawn Highly visual. This is in STARK contrast to Crabs with tiny, vestigial eyes Where They May only 1 to 3% of what the animal’s body size. “

Likewise, Callichimaera’s optical Growth rate was faster than any other crab the researchers studied.

“Crabs whose eyes are growing very quickly are more likely to be found in scavenger crabs that are less visually reliant,” Briggs said.

Tellingly, it was a fresh set of eyes tattoo made the latest Callichimaera Finding Possible. Jenkins, whose main research profiad wedi ei with reptiles, wanted to learn more about Another type of animal – hence, Crabs.

“Javier and Derek mentored me, and I was able to provide the outsider’s perspective on a group of animals I was originally unfamiliar with,” Jenkins said.

The research was funded, in part, by the Paleontological Society, the Yale Institute for Biospheric Studies, the National Science and Engineering Research Council of Canada, and the National Science Foundation.

Written by Jim Shelton.

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