Bits of bugs and plants in the ancient goo provide a glimpse of the amphibians’ lives
About 99 million years ago, tiny frogs hopped through a wet, tropical forest — and an unlucky few ran afoul of some tree sap. Four newly described frog fossils, preserved in amber, offer the earliest direct evidence of ancient frogs living in a humid tropical clime — just as many modern amphibians do.
None of the frog fossils is complete, making it difficult to place the frogs within their family tree: One has a partial skull and another a froggy outline, although CT scanning revealed no remaining skeletal material inside the impression. So researchers dubbed all four fossils Electrorana limoae (electrum for “amber” and rana for “frog”) in a study published June 14 in Scientific Reports. Anatomy-wise, the ancient frogs most resemble a modern group that includes fire-bellied toads.
The fossil record contains relatively few frogs, despite