Pseudoras niger is generally an all black species. However, there is usally a pale horizontal stripe down the side. The type location is listed as "South America"

The spiny catfish family Doradidae are native primarily to the mainland of South America. There generally is always at least one row of thorn like spines along the side of the body. Furthermore, there are spines in the dorsal and pectoral fins. As of 1985 there were about 135 species known in this family which included the subfamily Auchenipterinae and the subfamily Ageneisionae.

Catfish, Order Siluriformes, are found throughout the world. Although most of them are freshwater kinds, a few are found in a marine environment. They are characterized by having whiskers and barbels around their mouths. Many search for their food by smell and make little use of their small eyes.

Bony fish, Class Teleostomi, are a class of chordates that include the majority of fish-like animals found on earth. They are characterized by a bony jaw and a bony skeleton. They are found in both fresh and marine waters.

Backboned Animals (Phylum Chordata) are the most advanced group of animals on earth. These animals are characterized by having a spinal cord or backbone. Most members have a clearly defined brain that controls the organism through a spinal cord. Fish, amphibians, reptiles, birds, and mammals are in this phylum.

Currently, some taxonomists believe that the fish should be divided into two groups (sharks and regular fishes) and that there are some other primitive groups in the phylum such as hagfish or lampreys.

Animal Kingdom contains numerous organisms that feed on other animals or plants. Included in the animal kingdom are the lower marine invertebrates such as sponges and corals, the jointed legged animals such as insects and spiders, and the backboned animals such as fish, amphibians, reptiles, birds, and mammals.

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