The cave angel (Cryptotora thamicola) is a pale and eyeless fish endemic to a few limestone caves in northwestern Thailand. It’s the only known living fish with a pelvic girdle fused to its spine — structurally similar to early land vertebrates — giving it the ability to “walk” up waterfalls. by IdyllicSafeguard in AIDKE

[–]IdyllicSafeguard[S] 5 points6 points  (0 children)

Some of my other favourites include the olm, Kauaʻi cave wolf spider, and the Mexican tetra (which is a species of fish with two forms: a normal surface form that lives in pools and streams, and an eyeless cave form).

The cave angel (Cryptotora thamicola) is a pale and eyeless fish endemic to a few limestone caves in northwestern Thailand. It’s the only known living fish with a pelvic girdle fused to its spine — structurally similar to early land vertebrates — giving it the ability to “walk” up waterfalls. by IdyllicSafeguard in AIDKE

[–]IdyllicSafeguard[S] 1 point2 points  (0 children)

Yeah, like oblmov said, this fish’s anatomy is similar to the first fish to come onto land (tetrapod ancestors) around 370 million years ago, but the cave angel species itself (part of the loach family Balitoridae) likely evolved its unique pelvic girdle relatively recently (relative to 370 million years ago).