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During some period of their life cycle, chordates possess a notochord , a dorsal nerve cord , pharyngeal slits , an endostyle , and a post-anal tail: Chordates are also bilaterally symmetric ; and have a coelom , metameric segmentation , and a circulatory system. The Chordata and Ambulacraria together form the superphylum Deuterostomia. Chordates are divided into three subphyla: Vertebrata fish , amphibians , reptiles , birds , and mammals ; Tunicata salps and sea squirts ; and Cephalochordata which includes lancelets.
There are also extinct taxa such as the Vetulicolia. Hemichordata which includes the acorn worms has been presented as a fourth chordate subphylum, but now is treated as a separate phylum: Of the more than 65, living species of chordates, about half are bony fish that are members of the superclass Osteichthyes. Chordate fossils have been found from as early as the Cambrian explosion , million years ago. Cladistically phylogenetically , vertebrates - chordates with the notochord replaced by a vertebral column during development - are considered to be a subgroup of the clade Craniata , which consists of chordates with a skull.
The Craniata and Tunicata compose the clade Olfactores. See diagram under Phylogeny. Chordates form a phylum of animals that are defined by having at some stage in their lives all of the following anatomical features: There are soft constraints that separate chordates from certain other biological lineages, but are not part of the formal definition:.
The following schema is from the third edition of Vertebrate Palaeontology. Craniates , one of the three subdivisions of chordates, all have distinct skulls. They include the hagfish , which have no vertebrae. Michael J.
Benton commented that "craniates are characterized by their heads, just as chordates, or possibly all deuterostomes , are by their tails". Most craniates are vertebrates , in which the notochord is replaced by the vertebral column.
However hagfish have incomplete braincases and no vertebrae, and are therefore not regarded as vertebrates,  but as members of the craniates, the group from which vertebrates are thought to have evolved.
The position of lampreys is ambiguous. They have complete braincases and rudimentary vertebrae, and therefore may be regarded as vertebrates and true fish. Notochord , 2.
Nerve chord, 3. Buccal cirri , 4. Pharynx , 5. Gill slit , 6. Gonad , 7. Gut, 8. V-shaped muscles, 9. Anus, Inhalant syphon , Exhalant syphon, Heart, Stomach, Esophagus , Intestines, Tail, Atrium, Most tunicates appear as adults in two major forms, known as "sea squirts" and salps , both of which are soft-bodied filter-feeders that lack the standard features of chordates. Sea squirts are sessile and consist mainly of water pumps and filter-feeding apparatus;  salps float in mid-water, feeding on plankton , and have a two-generation cycle in which one generation is solitary and the next forms chain-like colonies.
Cephalochordates are small, "vaguely fish-shaped" animals that lack brains, clearly defined heads and specialized sense organs. There is still much ongoing differential DNA sequence based comparison research that is trying to separate out the simplest forms of chordates.
Some chordate lineages may only be found by DNA analysis, when there is no physical trace of any chordate-like structures. Attempts to work out the evolutionary relationships of the chordates have produced several hypotheses.
The current consensus is that chordates are monophyletic , meaning that the Chordata include all and only the descendants of a single common ancestor, which is itself a chordate, and that craniates ' nearest relatives are tunicates.
All of the earliest chordate fossils have been found in the Early Cambrian Chengjiang fauna , and include two species that are regarded as fish , which implies that they are vertebrates.
Because the fossil record of early chordates is poor, only molecular phylogenetics offers a reasonable prospect of dating their emergence. However, the use of molecular phylogenetics for dating evolutionary transitions is controversial. It has also proved difficult to produce a detailed classification within the living chordates. Attempts to produce evolutionary " family trees " shows that many of the traditional classes are paraphyletic.
While this has been well known since the 19th century, an insistence on only monophyletic taxa has resulted in vertebrate classification being in a state of flux. The majority of animals more complex than jellyfish and other Cnidarians are split into two groups, the protostomes and deuterostomes , the latter of which contains chordates. The evolutionary relationships between the chordate groups and between chordates as a whole and their closest deuterostome relatives have been debated since Studies based on anatomical, embryological , and paleontological data have produced different "family trees".
Some closely linked chordates and hemichordates, but that idea is now rejected.
Since early chordates have left a poor fossil record, attempts have been made to calculate the key dates in their evolution by molecular phylogenetics techniques—by analyzing biochemical differences, mainly in RNA.
More recently, Cephalochordata has been thought of as a sister group to the "Olfactores", which includes the craniates and tunicates. The matter is not yet settled. Phylogenetic tree of the Chordate phylum.
Some are invertebrates. The positions relationships of the Lancelet, Tunicate, and Craniata clades are as reported    . Appendicularia formerly Larvacea. Acanthodii , incl Chondrichthyes. Lepidosauromorpha lizards , snakes , tuatara , and their extinct relatives. Archosauromorpha crocodiles , birds , and their extinct relatives.
Hemichordates "half chordates" have some features similar to those of chordates: There are two living groups of hemichordates. The solitary enteropneusts , commonly known as "acorn worms", have long proboscises and worm-like bodies with up to branchial slits, are up to 2.
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