deuterostomes and protosomes (echinodermata + chordata)
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21 Terms
deuterostomes
radial cleavage
indeterminate cleavage
mesoderm forms enterocoely
indeterminate cleavage
when original cell divides and each two resulting cells can develop into a whole organism
radial cleavage
results in indeterminant cells
blastospore develops the anus (mouth second)
protostomes
spiral cleavage
determinate cleavage
mesoderm forms schizocoely
spiral cleavage
blastospore forms the mouth (mouth first)
determinate cleavage
cells of resulting embryo are not able to develop into clone organisms when separated
enterocoely
mesoderm develops as pouches pinched off the endoderm tissue
schizocoely
mesoderm forms from the splitting of the solid mass of mesodermal cells
echinodermata
sea stars, sea urchines, sea cucumber
deuterostomes
spiny skin
pentamerous symmetry
water-vascular system
madreporite and tube feet
water-vascular system
water comes in through the madreporite and travels through until the water goes out the tube foot
spiny skin
made up of internal endoskeleton with spines
pedicellariae
tiny pincers on aboral surfaces that protect and clean
chordata characteristics
notochord
nerve chord
pharyngeal pouches
tail
endostyle/thyroid gland
notochord
dorsal elastic supporting rod that extends the length of the body
provides support for muscle attachment
nerve chord
dorsal, hollow, allows the anterior end to enlarge to form a brain
pharyngeal pouches (gill slits)
slit openings that lead the pharyngeal cavity to the outside as a filter feeder
tail
tail added to body behind the end of digestive tract for water propulsion
endostyle/thyroid gland
secretes hormones
cephalochordates
lancelets
found in marine, sandy coastal waters
elongated and closest to vertebrates
urochordata
tunicates, filter feeders
only 2 characteristics (endostyle + pharyngeal gill slits)
paedomorphosis
paedomorphosis
process where organisms retain traits that were present in their ancestral larval/juvenile stages