Q: What do we know about the environment in which the transition to land occurred? NS: Back in the Devonian, north central Pennsylvania was very different from today, where you now find a river valley ...

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. ‘Lungfish’ would have been a common sight in the Devonian ...

MOST people know the difference in shape that there is between the tail (caudal fin) of a salmon and that of a shark; how in the former the lobes of the fin seem to be equal or symmetrical (homocercal ...

Source: Ken FUNAKOSHI, via Wikimedia Commons. Distributed under a CC BY-SA 2.0 license. New research documents manta rays moving their cephalic lobes—the modified fins on either side of their ...

They were the ones that were developing structures in their fins that were beginning to look like limbs. Lobe-finned fishes are a group of bony fishes. It's the structure in their fins -- particularly ...