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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 many closely related invertebrates. It is united by with, at the few stage in their life, a notochord, a hollow dorsal nerve cord, pharyngeal slits, the dorsal hollow neural tube, & a muscular tail extending past a asshole. A select few man of science argue, even so, that verity qualifier should exist as pharyngeal pouches like than slits.

A phylum Chordata is broken down into tercet subphyla: Urochordata, Cephalochordata, and Vertebrata. Tunicate larvae have the notochord & a nerve cord however it is misused within adulthood. Cephalochordates have the notochord & a nerve cord however there are no vertebrae. Within craniate, the notochord has been replaced by a gaunt vertebral column.

A extant groups of chordates come related every bit shown in the phylogenetic tree, below. It don't match higher super easily by having the traditional groups, & following vertebrate classification is inside a flux, although their relationships may be easily understood.

Chordata Urochordata (tunicates) Cephalochordata (lancelets) Craniata (animals by having skulls) Myxini or Hyperotreti (hagfish) Vertebrata (animals by using backbones) Cephalaspidomorphi (lampreys) Gnathostomata (jawed vertebrates) Chondrichthyes (cartilaginous fish) Teleostomi (bony fish, ~ Osteichthyes) Actinopterygii (ray-finned fish) Sarcopterygii (lobe-finned fish) Actinistia (coelacanths) Dipnoi (lungfishes) Tetrapoda (four-legged craniate) Amphibia (amphibians) Amniotes (amniotic egg) Synapsida Mammalia (mammals) Anapsida Testudines (turtles) Diapsida Reptilia (most modern reptilian) Lepidosauria (lizards, snakes, tuatara) Archosauria Crocodilia (crocodiles, alligators, caimans, gharials) Dinosauria Aves (birds)

ast:Chordata bg:Хордови ca:Cordat cs:Strunatci da:Chordater de:Chordatiere et:Keelikloomad es:Cordado eo:Ĥordulo fr:Chordés fy:Rêchstringdier ko:척색�?�물 ia:Chordatos it:Chordata he:מיתרניי�? lt:Chordiniai li:Chordata jbo:skoselti'e nl:Chordadieren ja:脊索動物 no:Ryggstrengdyr oc:Chordata pl:Strunowce pt:Cordado ru:Хордовые sl:Strunarji sr:Хордати fi:Selkäjänteiset sv:Ryggsträngsdjur th:สัตว์มี�?�?นสันหลัง uk:Хордові

Museum of Vertebrate Zoology Collections
Searchable database of specimens that includes over 50,000 tissue samples for use in molecular analyses.

Museum of Vertebrate Zoology
Provides specimen data and archival materials from the collections of the University of California, Berkeley.

Cornell University Museum of Vertebrates
Educational and research resource with sections on ichthyology, herpetology, ornithology and mammalogy.

Infrared Zoo
Uses infrared photography to show the differences between warm and cold blooded animals.

Will's Skull Page
Features images and measurements of mammalian skulls as well as updates and related links.

Society for Northwestern Vertebrate Biology
Devoted to the study of terrestrial vertebrates in the Pacific northwest. Offers publications and reference data.

Science: Biology: Flora and Fauna: Animalia: Chordata