Difference between revisions of "Chordata"
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(Echinodermata are the closest to chordata, because they both have an endoskeleton) |
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Apart from the spinal cord, other common features include a single [[brain]] and a zig-zag [[muscle]] structure in the [[torso]]. | Apart from the spinal cord, other common features include a single [[brain]] and a zig-zag [[muscle]] structure in the [[torso]]. | ||
| − | Scientists believe that the chordata are closest to the [[arthropoda]] (shelled, joint-legged animals such as [[insect]]s and [[crustacean]]s) and [[annelida]] (earthworms) in biology, due to common features such as [[segment]]ation, which are not seen in other phyla such as the [[mollusca]] (molluscs) or [[coelenterata]] [[jellyfish]] and [[sea anemone]]s. | + | Scientists believe that the chordata are closest to the [[arthropoda]] (shelled, joint-legged animals such as [[insect]]s and [[crustacean]]s), [[echinodermata]] (spiny-skinned animals such as [[starfish]] and [[sea urchin]]s), and [[annelida]] (earthworms) in biology, due to common features such as [[segment]]ation, which are not seen in other phyla such as the [[mollusca]] (molluscs) or [[coelenterata]] ([[jellyfish]] and [[sea anemone]]s). |
==See also== | ==See also== | ||
Revision as of 17:26, May 20, 2011
Chordata is a phylum of animals, named after their common feature - possession of a spinal cord.
The phylum includes several classes:
- Mammalia - the mammals
- Aves - the birds
- Reptilia - The reptiles
- Amphibia - the amphibians (such as frogs, newts and salamanders)
- Pisces - the fish
There are also several obscure animals including the acorn worm, lancelet and hagfish.
Apart from the spinal cord, other common features include a single brain and a zig-zag muscle structure in the torso.
Scientists believe that the chordata are closest to the arthropoda (shelled, joint-legged animals such as insects and crustaceans), echinodermata (spiny-skinned animals such as starfish and sea urchins), and annelida (earthworms) in biology, due to common features such as segmentation, which are not seen in other phyla such as the mollusca (molluscs) or coelenterata (jellyfish and sea anemones).
