Hemichordates

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Chordate features
Notochord, dorsal hollow nerve chord, pharyngeal slits, post anal tail
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Notochord
all chordate embryos, stiff flexible rod cartilage, muscles act against, stays in some adults
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Dorsal hollow nerve chord
below notochord, becomes CNS, unique- hollow, formed from invagination of ectoderm
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pharyngeal slits
no sig role in respiration, fish - modified to gills, terrestrial chordates - only in embryo
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post anal tail
most choradates, in aquatic spp
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phylum hemichordata
have - slits and dorsal hollow nerve chord do not have - post anal tail, notochord example: acorn worm
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cephalochordata
Lanclets - marine, sand burrowing filter feeders, rudementary sense organs, no brain, 4 chordate features
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Urochordata - sea squirts
solitary/ colonial, larvae planktonic, adults sessile and plankton feeders
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class thaliacea
free living, filter feeders, agregates/ solitary
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class larvacea
small planktonic marines, adults retain larvae characteristics, tail - notochord
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Vertebrata - vertebral coloumn
large no vert, support&locomotion,
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Other cards in this set

Card 2

Front

Notochord

Back

all chordate embryos, stiff flexible rod cartilage, muscles act against, stays in some adults

Card 3

Front

Dorsal hollow nerve chord

Back

Preview of the front of card 3

Card 4

Front

pharyngeal slits

Back

Preview of the front of card 4

Card 5

Front

post anal tail

Back

Preview of the front of card 5
View more cards

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