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Protochordates
| Question | Answer |
|---|---|
| thaliacea | salps-colonial, pelagic, form large barrels |
| larvacea | appendicularians-pelagic, paedomorphic, stay with big head and tail, make mucus houses |
| ascidiacea | sea squirts-sessile, colonial, biphasic life style (1-larval: free living, land head first, adhere, retract tail, 2-sessile: attached and don't move), hermaphrodite |
| Hox genes | homeobox, involved in establishment of axes of orientation and metamerism, chordate origins |
| metamerism | body segmentation |
| flame cells | excretory cells in annelids |
| gastrula | embryo is hollow ball of cells with one opening |
| schizocoely | mesoderm splits, protostome |
| enterocoely | mesoderm pinches and separates then folds over, deuterostome |
| lamaryali | knots of capillaries in enteropneusta that squeeze out and filtrate blood, located in probiscus |
| protochordates | chordates that aren't craniates, urochordata and cephalochordata |
| paedomorphosis | maintaining child-like shape |
| endostyle | becomes thyroid in craniates, present in tunicates and cephalochordates, mucus-producing, moves around gills picking up food, string of mucus moves to intestine |
| cerebral vesicle | cluster of sensory cells, orientation, larval tunicate |
| myomere | adult repeated segments, somitochordate |
| caecum | pouch connecting ileum with ascending colon of large intestine, somitochordate |
| solenocyte | similar to annelid flame cells, excretion of cephalochordate |
| arcualia | rudimentary vertebrae, agnathans |
| muscular velum | thick, muscular membrane to create suction; brings in much more water than cephalochordate; craniate |
| heterchrony | differences in timing of development, result: paedomorphic, proposed theory of cranaite origins |
| neotony | paedomorphisis |
| neural crest ectoderm | tissue that runs along length of animal's body next to neural cord, migrates through body and distributes many body forms |
| epidermal (neurogenic) placodes | come from ectoderm, give rise to structures, sensory organs and nerve ganglia of major nerves that come out of the head |
| muscularized hypomere | operate gills; branchial basket compression, push water from mouth to gills, create suction; tongue, mouth, larynx |
Created by:
emarti16
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