Difference between revisions of "Chordata"
(Echinodermata are the closest to chordata, because they both have an endoskeleton) |
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| − | '''Chordata''' is a [[phylum]] of [[animal]]s, named after their | + | '''Chordata''' is a [[phylum]] of [[animal]]s, named after their possession of a [[notochord]] at some point during their lives (embryonic, juvenile, or adult). Chordates have four other unifying characteristics, also possessed at some life stage: a dorsal [[nerve]] cord, an endostyle, a post-anal [[tail]], and [[pharyngeal pouches]]. Many chordates have a [[spinal column]], and are therefore [[vertebrates]]. |
| − | The phylum includes several [[class (biology)|classes]]: | + | The phylum includes several [[class (biology)|classes]], the most well-known of which are vertebrates: |
| − | *'''Mammalia''' - the [[mammal]]s | + | *'''Mammalia''' - the [[mammal]]s, such as the cats and the great apes |
*'''Aves''' - the [[bird]]s | *'''Aves''' - the [[bird]]s | ||
| − | *'''Reptilia''' - The [[reptile]]s | + | *'''Reptilia''' - The [[reptile]]s, such as the (extinct) [[dinosaurs]] |
*'''Amphibia''' - the [[amphibian]]s (such as [[frog]]s, [[newt]]s and [[salamander]]s) | *'''Amphibia''' - the [[amphibian]]s (such as [[frog]]s, [[newt]]s and [[salamander]]s) | ||
*'''Pisces''' - the [[fish]] | *'''Pisces''' - the [[fish]] | ||
| − | There are also several obscure animals including the [[acorn worm]], [[lancelet]] and [[hagfish]]. | + | There are also several obscure non-vertebrate animals including the [[acorn worm]], [[lancelet]] and [[hagfish]]. |
| − | + | Other common features include a single [[brain]] and a zig-zag [[muscle]] structure in the [[torso]], although these are not unique to the chordates. | |
| − | 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). | + | 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). This is, of course, wrong because it promotes the "theory" of [[evolution]]. |
==See also== | ==See also== | ||
*[[Scientific Classification]] | *[[Scientific Classification]] | ||
| − | [[ | + | [[Category:Chordata| ]] |
Latest revision as of 01:55, July 12, 2021
Chordata is a phylum of animals, named after their possession of a notochord at some point during their lives (embryonic, juvenile, or adult). Chordates have four other unifying characteristics, also possessed at some life stage: a dorsal nerve cord, an endostyle, a post-anal tail, and pharyngeal pouches. Many chordates have a spinal column, and are therefore vertebrates.
The phylum includes several classes, the most well-known of which are vertebrates:
- Mammalia - the mammals, such as the cats and the great apes
- Aves - the birds
- Reptilia - The reptiles, such as the (extinct) dinosaurs
- Amphibia - the amphibians (such as frogs, newts and salamanders)
- Pisces - the fish
There are also several obscure non-vertebrate animals including the acorn worm, lancelet and hagfish.
Other common features include a single brain and a zig-zag muscle structure in the torso, although these are not unique to the chordates.
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). This is, of course, wrong because it promotes the "theory" of evolution.
