Regan's bishop (Brachyrhaphis rhadophora) is found on both the Atlantic and Pacific side of Costa Rica. This females of this fish can be just over 2 inches in length. The males are much smaller. There are two images (one of a male, and another of a female) on page 317 of the 1985 version of the Burgess-Axelrod atlas of freshwater aquarium fish. Both images show a rather plain colored silver fish.

Brachyrhaphis genus is found from extreme southwestern Mexico south to Costa Rica and Panama. There were about 8 total known species in this genus as of 2005. This genus is closely related to the Gambusia genus.

The Poeciliidae (equal Poecilidae) are a group of live bearing fish native to both North and South America. This family includes many tropical species favored by the pet store industry. There are probably about 18O species in the family. The mosquitofish (Gsambusia affinis) has been introduced widely around the world and is probably the most widely distributed fresh water fish. The guppy, platy, swordtail, and others belong here.

Atheriniformes group of fish consists of diverse marine and freshwater kinds. It includes many of the tropical aquarium fish (guppies, mollies, and platies), flying fish, and the needle fish of the ocean.

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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