This Candiru catfish, Tridensimilus brevis, goes by the common names of "dwarf parasitic catfish," "glass parasitic catfish," and "glass candiru." The species was described in 1889 from tributaries of the Amazon River in Peru. This is a small species, rarely growing longer than 2 inches total length. The translucent nature of its tissues give the fish its name. When it has fed on the blood of a larger fish, by entering its gill chamber and chewing on its gill tissue, the full stomach of the parasite can be seen through its sides (as depicted). Candiru are also rumored to swim up the urethras of humans, becoming lodged there. This specimen photographed in Amazonian Peru 2012.