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Chordata Temporal range: Fortunian ? Holocene , 535?0  Ma Pre? ? O S D C P T J K Pg N
The X-ray tetra ( Pristella maxillaris ) is ane o the few chordates wi a visible backbone . The spinal cord is hoosed within its backbone.
Scientific classification
Kinrick:	Animalia
Superphylum:	Deuterostomia
Phylum:	Chordata Haeckel , 1874 [1]

Chordates , members o the phylum Chordata , are deuterostome ainimals possessin a notochord , a hollae dorsal nerve cord , pharyngeal slits , an endostyle , an a post-anal tail for at least some period o thair life cycles. Taxonomically, the phylum includes the subphyla Vertebrata , includin mammals , fish , amphibians , reptiles , birds ; Tunicata , includin salps an sea squirts ; an Cephalochordata , comprisin the lancelets . For a recent concise review o chordate relationships, see Holland, N. D. 2005, Chordates. Curr. Biol. 15: R911-R914.

The phylum Hemichordata includin the acorn worms haes been presented as a fowert chordate subphylum, but it nou is uisually treatit as a separate phylum. It, alang wi the echinoderm phylum, includin starnfish , sea urchins , an sea cucumbers an thair kin, is the chordates' closest relatives. Primitive chordates are kent frae at least as early as the Cambrian explosion .

Thare mair nor 75,000 livin species o chordates, aboot hauf o whilk is banie fish o the class osteichthyes . The warld's lairgest ainimal, the blue whaul , an festest ainimal, the peregrine falcon , are chordates. ^[2]

References [ eedit | eedit soorce ]

Freemit airtins [ eedit | eedit soorce ]

• Chordate at the Encyclopedia o Life
• Chordate on GlobalTwitcher.com
• Chordate node at Tree O Life Archived 2007-02-24 at the Wayback Machine
• Chordate node at NCBI Taxonomy

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