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

The Shedd Aquarium's Karen Murchie expects her sucker research into longnose suckers to expand knowledge on a prime prey fish ...

Listrura elongata is a fossorial, or burrowing, species that has evolved without its dorsal or pelvic fins, according to a study published July 4 in the journal Zoosystematics and Evolution.

Listrura elongata is a fossorial, or burrowing, species that has evolved without its dorsal or pelvic fins, according to a study published July 4 in the journal Zoosystematics and Evolution.

They share the trait of fused pelvic fins that provide suction on the rock and presumably a brace for starting an upward push by the pectoral fins. That brace detaches as the fish undulates up ...

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.

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.

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.