The fish popularly known as darters are small perch-like fish. They inhabit freshwater streams in North America. They include members of the Ammocrypta, Crystallaria, Etheostoma and Percina genera. Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms (as opposed to folk taxonomy). ... Phyla Subregnum Parazoa Porifera (sponges) Subregnum Agnotozoa Placozoa (trichoplax) Orthonectida (orthonectids) Rhombozoa (dicyemids) Subregnum Eumetazoa Radiata (unranked) (radial symmetry) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anemones) Bilateria (unranked) (bilateral symmetry) Acoelomorpha (basal) Orthonectida (parasitic to flatworms, echinoderms, etc. ... Typical Classes Subphylum Urochordata - Tunicatas Ascidiacea Thaliacea Larvacea Subphylum Cephalochordata - Lancelets Subphylum Myxini - Hagfishes Subphylum Vertebrata - Vertebrates Petromyzontida - Lampreys Placodermi (extinct) Chondrichthyes - Cartilaginous fishes Acanthodii (extinct) Actinopterygii - Ray-finned fishes Actinistia - Coelacanths Dipnoi - Lungfishes Amphibia - Amphibians Reptilia - Reptiles Aves - Birds Mammalia - Mammals Chordates (phylum Chordata) include the vertebrates, together with... Orders See text The Actinopterygii are the ray-finned fish. ... Families many, see text The Perciformes, also called the Percomorphi or Acanthopteri, include about 40% of all fish and are the largest order of vertebrates. ... Species See text. ... Species Many, including: Etheostoma fonticola Etheostoma blennioides Etheostoma boschungi The Etheostoma are a genus of small freshwater fish. ... Percina is a genus of small, mostly North American fish. ... Species P. flavescens (Yellow perch) P. fluviatilis (European perch) P. schrenkii (Balkhash perch) Perca is the genus of fish referred to as perch or yellow perch, a group of freshwater fish belonging to the family Percidae. ... For the village on the Isle of Wight, see Freshwater, Isle of Wight. ... Species See text. ... Species Many, including: Etheostoma fonticola Etheostoma blennioides Etheostoma boschungi The Etheostoma are a genus of small freshwater fish. ... Percina is a genus of small, mostly North American fish. ...

Some darters are widespread throughput North America most notably Nutley New Jersey, Tennessee, and Kentucky, but others are restricted to single streams, leaving them vulnerable to extinction. In biology and ecology, extinction is the ceasing of existence of a species or group of taxa. ...