Difference between revisions of "Invertebrate"
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*[[Annelid]]a - [[Worm]]s | *[[Annelid]]a - [[Worm]]s | ||
*[[Brachiopod]]a - [[Bivalve]]s, such as [[mussel]]s and [[clam]]s | *[[Brachiopod]]a - [[Bivalve]]s, such as [[mussel]]s and [[clam]]s | ||
| − | *[[Polyzoa]] - Single celled | + | *[[Polyzoa]] - Single celled critters that usually form colonies |
*[[Mullusc]]a - [[Whelk]]s, [[ammonite]]s, [[cuttlefish]], [[squid]]s, [[snail]]s, etc. | *[[Mullusc]]a - [[Whelk]]s, [[ammonite]]s, [[cuttlefish]], [[squid]]s, [[snail]]s, etc. | ||
*[[Arthropod]]a - [[Crustacean]]s, [[insect]]s, [[arachnid]]s, [[trilobite]]s, etc.<ref>Invertebrate Paleontology, Henry Woods, Cambridge University Press, 8th Edition (1946)</ref> | *[[Arthropod]]a - [[Crustacean]]s, [[insect]]s, [[arachnid]]s, [[trilobite]]s, etc.<ref>Invertebrate Paleontology, Henry Woods, Cambridge University Press, 8th Edition (1946)</ref> | ||
Revision as of 22:38, December 10, 2007
An invertebrate (in contrast to a vertebrate), is an animal with no spine. Most living things are invertebrates, including arthropods, molluscs, and bacteria.
Sharks and rays are a special class under this description, since they do not have bony skeletons, and hence no spine. They do, however, have a similar structure to vertebrates. They are called notochords.
The phyla contained in Invertebrata are:
- Protozoa - Mostly simple, single-celled organisms
- Porifera - Sponges
- Coelentera - Hydra, jellyfish, anemones and corals
- Echinoderma - Starfish, sea urchins and sea cucumbers
- Annelida - Worms
- Brachiopoda - Bivalves, such as mussels and clams
- Polyzoa - Single celled critters that usually form colonies
- Mullusca - Whelks, ammonites, cuttlefish, squids, snails, etc.
- Arthropoda - Crustaceans, insects, arachnids, trilobites, etc.[1]
References
- ↑ Invertebrate Paleontology, Henry Woods, Cambridge University Press, 8th Edition (1946)