Hemichordates 3.0 / 5 based on 1 rating ? AllUniversityAll boards Created by: simren soorCreated on: 22-04-13 15:35 Chordate features Notochord, dorsal hollow nerve chord, pharyngeal slits, post anal tail 1 of 11 Notochord all chordate embryos, stiff flexible rod cartilage, muscles act against, stays in some adults 2 of 11 Dorsal hollow nerve chord below notochord, becomes CNS, unique- hollow, formed from invagination of ectoderm 3 of 11 pharyngeal slits no sig role in respiration, fish - modified to gills, terrestrial chordates - only in embryo 4 of 11 post anal tail most choradates, in aquatic spp 5 of 11 phylum hemichordata have - slits and dorsal hollow nerve chord do not have - post anal tail, notochord example: acorn worm 6 of 11 cephalochordata Lanclets - marine, sand burrowing filter feeders, rudementary sense organs, no brain, 4 chordate features 7 of 11 Urochordata - sea squirts solitary/ colonial, larvae planktonic, adults sessile and plankton feeders 8 of 11 class thaliacea free living, filter feeders, agregates/ solitary 9 of 11 class larvacea small planktonic marines, adults retain larvae characteristics, tail - notochord 10 of 11 Vertebrata - vertebral coloumn large no vert, support&locomotion, 11 of 11
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