In a forested region of Angola where a cliff separates the landscape, a new species of butterfly was discovered. /iStockphoto ...

A Goggia sabula, or gravel pygmy gecko. Photo from Courtney Hundermark ... In the tea-colored rivers of northern Brazil, a new species of catfish named Hoplisoma noxium, or the noxium armored ...

Published April 3 | Read More | A Goggia sabula, or gravel pygmy gecko ... In the tea-colored rivers of northern Brazil, a new species of catfish named Hoplisoma noxium, or the noxium armored ...

This fish plays well with others and makes a good tank mate for dwarf gourami. Measuring around 3 to 5 inches in length when fully grown, this catfish species showcases sexual dimorphism ...

The dwarf gourami is one of the smallest members ... and patterns depending on the exact species. Unlike some larger catfish species, Otocinclus catfish tend not to damage larger aquarium plants.