Since the last ice age 15,000 years ago, isolated populations of a freshwater fish called threespine sticklebacks have lost their three sharp- pointed pelvic fins, probably to avoid predators that ...

They don’t have pelvic fins — in the fish world that’s akin to not having hind legs. Instead they flutter their dorsal fins as many as 30 times a second to help them move around in the water.

The new species has been found in two small isolated waterways in Brazil's Atlantic Forest, according to a study.

A trove of fossils in China, unearthed in rock dating back some 436 million years, have revealed for the first time that the mysterious galeaspids, a jawless freshwater fish, possessed paired fins.

Interestingly, he says, pectoral fins seems to have evolved more rapidly than the pelvic fins, with the mechanism of their development in fish being similar to that used in the legs of land ...

Curtin University researchers have revealed how the pelvic fins of fish such as sharks and chimaeras have evolved from their sudden appearance in the fossil record over 410 million years ago.

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A trove of fossils in China, unearthed in rock dating back some 436 million years, have revealed for the first time that the mysterious galeaspids, a jawless freshwater fish, possessed paired fins.