The skeletal structure of a fish's gill arches and paired fins are quite similar – enough so that it was once believed the fins evolved from the arches. Although that theory has since been ...

While their gill arches haven’t survived, their braincases do, meaning that researchers can see where the arches and associated soft tissue once connected to their head. While the gill arches no ...

Gill arches are the collection of looped bones that support gills and serve as the sprouting point for gill arch appendages, or branchial rays.

Yes, those are gills. At these sorts of resolutions, it's possible to go beyond the "Well, those look like gills and gill arches" analysis that leads to conflicting interpretations.

In 1878, German anatomist Karl Gegenbaur proposed a theory that fish fins and human limbs evolved from a structure that resembles gill arches, a collection of bony "loops" in fish that support the ...

This fish did not have full-fledged jaws, but its gill arches, with paired separate bones rather than continuous single bones, were “a staging post in the evolutionary story of vertebrates ...

"Taken to the extreme, these experiments could be interpreted as evidence that limbs share a genetic programme with gill arches because fins and limbs evolved by transformation of a gill arch in ...

The branchial rays extend like a series of fingers down the side of a shark gill arch," said Andrew Gillis, who led the research, in a statement. Enlarge Image ...

“Gegenbaur speculated that gill arches and fins/limbs were evolutionarily related because they appear to be built according to a common ground plan,” lead author Andrew Gillis told Gizmodo.

There are no fish yet on the record with primitive, semi-moving jaws or gill arches that are close enough to the mouth to manipulate it but too far to be considered actual jaws. What there are ...

Modern sharks, though, have a different arrangement of gill supports that likely evolved after O. mapesae.So if scientists want to study the evolution of these arches and the jaws that followed ...

In 1878, influential German anatomist Karl Gegenbaur presented the theory that paired fins and eventually limbs evolved from a structure resembling the gill arch of cartilaginous fishes.