Gourt > Science > Biology > Zoology > Chordates (13)
Chordates (phylum Chordata) are a group of animals that includes the vertebrates, together with several closely related invertebrates. They are united by having, at some time in their life, a notochord, a hollow dorsal nerve cord, pharyngeal slits, an endostyle, and a muscular tail extending past the anus. Some scientists argue, however, that the true qualifier should be pharyngeal pouches rather than slits.
The phylum Chordata is broken down into three subphyla: Urochordata, Cephalochordata, and Vertebrata. Urochordate larvae have a notochord and a nerve cord but they are lost in adulthood. Cephalochordates have a notochord and a nerve cord but no vertebra. In all vertebrates except for Hagfish, the dorsal hollow nerve cord has been surrounded with cartilaginous or bony vertebrae and the notochord generally reduced.
The chordates and two sister phyla, the hemichordates and the echinoderms, make up the deuterostomes, a superphylum.
More on [ Chordate ]
says phylum chordates ' class mammalia ' order ... |kaya co to'| (goodluck) http://plurk.com/p/2ipznb
MUSiQERA (kristel santiago) Thu, 05 Nov 2009 11:50:23 -0000
says phylum chordates ' class mammalia ' order ... |kaya co to'| (goodluck) http://plurk.com/p/2ipznb
Bedtime! Yesssss :) Chordates quiz tmw morning :S
__hmcs (Heather Stephen) Thu, 05 Nov 2009 03:56:22 -0000
Bedtime! Yesssss :) Chordates quiz tmw morning :S
Don't wanna leave my bed..so much Chordates studying to do after class :(
__hmcs (Heather Stephen) Wed, 04 Nov 2009 14:52:42 -0000
Don't wanna leave my bed..so much Chordates studying to do after class :(
africa in the modern world, comparative anatomy chordates, general chem II and one other unpicked class. KILL. ME. NOW.
FUCKYEAHBITCH (Ronay) Wed, 04 Nov 2009 01:11:54 -0000
africa in the modern world, comparative anatomy chordates, general chem II and one other unpicked class. KILL. ME. NOW.
Cornell University Museum of Vertebrates - Educational and research resource with sections on ichthyology, herpetology, ornithology and mammalogy.
Meta Description: [ A brief introduction to the museum ]
Infrared Zoo - Uses infrared photography to show the differences between warm and cold blooded animals.
500
Museum of Vertebrate Zoology - Provides specimen data and archival materials from the collections of the University of California, Berkeley.
Museum of Vertebrate Zoology Collections - Searchable database of specimens that includes over 50,000 tissue samples for use in molecular analyses.
Meta Description: [ Specimen and archival collections of the Museum of Vertebrate Zoology, University of California, Berkeley ]
Society for Northwestern Vertebrate Biology - Devoted to the study of terrestrial vertebrates in the Pacific northwest. Offers publications and reference data.
Will's Skull Page - Features images and measurements of mammalian skulls as well as updates and related links.
Meta Description: [ Will's Skull Page homepage, links to species list, glossary etc ]
| Evolution of Chordates Part 1 of 2 | |
| Next Video | |
