1 species Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anenomes) Placozoa (trichoplax) Subregnum Bilateria (bilateral symmetry) Acoelomorpha (basal) Orthonectida (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 Anura Caudata Gymnophiona Allocaudata The Subclass Lissamphibia includes all recent amphibians. ... Families Salamander is the common name applied to approximately 350 amphibian vertebrates with slender bodies, short legs, and long tails (order Caudata or Urodela). ... Species Subfamily Desmognathinae Subfamily Plethodontinae Lungless salamanders (Family Plethodontidae) are salamanders which do not have lungs and instead conduct respiration through their skin and the tissues lining their mouth. ...
The Four-toed salamander (Hemidactylium) is native to North America and an endangered species. It is a member of the Plethodontidae family of salamanders, which is characterized by their absence of lungs; they instead achieve respiration through their skin and the tissues lining their mouth. It is a relatively small salamander, and usually only grows to lengths of 2 to 3.5 inches (5 to 10cm) at adulthood. It can be identified by its four-toed hind feet and its milk white belly, which is peppered with black markings. The American bison there are as few as 750 in 1890 due to extreme overhunting. ... Species Subfamily Desmognathinae Subfamily Plethodontinae Lungless salamanders (Family Plethodontidae) are salamanders which do not have lungs and instead conduct respiration through their skin and the tissues lining their mouth. ...