Ch 32: Animal Evolution
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24 terms
Spanish | English |
|---|---|
 acoelomate | a solid-bodied animal lacking a cavity between the gut and outer body wall |
| blastopore | the opening of the archenteron in the gastrula that develops into the mouth in protostomes and the anus in deuterostomes |
| blastula | the hollow ball of cells marking the end stage of cleavage during early embryonic development |
| body cavity | a fluid-containing space between the digestive tract and the body wall |
| coelom | a body cavity completely lined with mesoderm |
| coelomate | an animal whose body cavity is completely lined by mesoderm, the layers of which connect dorsally and ventrally to form mesenteries |
| determinate cleavage | a type of embryonic development in protostomes that rigidly casts the developmental fate of each embryonic cell very early |
| deuterostome | one of the two distinct evolutionary lines of coelomates, consisting of the echinoderms and chordates and characterized by radial, indeterminate cleavage, enterocoelous formation of the coelom, and development of the anus from the blastopore |
| diploblastic | having two germ layers |
| mesoderm | the middle primary germ layer of an early embryo that develops into the notochord, the lining of the coelom, muscles, skeleton, gonads, kidneys, and most of the circulatory system |
| parazoan | members of the subkingdom of animals consisting of the sponges |
| protostomes | a member of one of two distinct evolutionary lines of coelomates, consisting of the annelids, mollusks, and arthropods, and characterized by spiral, determinate cleavage, schizocoelous formation of the coelom, and development of the mouth from the blastopore |
| pseudocoelomate | an animal whose body cavity is not completely lined by mesoderm |
| Gastrovascular cavities | Where food is digested |
| Porifera | Sponges. They feed by filtering crap through |
| Cnidaria | Includes the jellyfish and corals. There are 2 body forms - medusa: jelly fish shape - polyp: a sessile cylindedr shaped body with rising tentacles |
| Platyhelminthes | Flatworms |
| Nematoda | Roundworm. They have peudocoelomate bodes with a complete digestive tract |
| Rotifera | They have specialized organs enclosed in a psedocoelom, and have a complete digestive tract. They are filter feeders |
| Mollusca | Has a complete digestive tract and an open circulatory system. Examples are octopus, squid, and clams |
| Annelida | Segmented worms |
| Arthropoda | Have jointed appendages, a well developed nervous system, specialization of body segments, and an exoskeleton of chitin. Some are born an nymphs (small version of the adult) or larvae. |
| Dorsal hollow nerve cord | basis of the nervous system |
| invertebrates and vertebrates | 2 groups of chordate |
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