Fig. 22-5, p.356
sponges cnidarians echinodermsflatworms annelids mollusks roundworms arthropods chordates
multicelled body
radial ancestry, two germ layers
true tissues
coelom lostcoelom reduced pseudocoel
coelom reduced
moltingPROTOSTOMES
mouth from blastopore
bilateral, coelomate ancestry, three germ layers
DEUTEROSOMESanus from blastopore
Fig. 22-6c, p.357
section through body wall:
glasslike structuralelements
amoeboid cell
pore
semifluid matrix
flattened surface cellscollar cell with a
central flagellum ringed by microvilli
Fig. 22-5, p.356
sponges cnidarians echinodermsflatworms annelids mollusks roundworms arthropods chordates
multicelled body
radial ancestry, two germ layers
true tissues
coelom lostcoelom reduced pseudocoel
coelom reduced
moltingPROTOSTOMES
mouth from blastopore
bilateral, coelomate ancestry, three germ layers
DEUTEROSOMESanus from blastopore
Fig. 22-7, p.358
lid
capsule's trigger (modified cilium)
barbed thread in capsule
barbs ondischargedthreadexposed
nematocyst (capsule at free surface of epidermal cell)
Fig. 22-9, p.359
reproductive polyp
female medusa male medusa
ovum sperm
zygote
planulapolypforming
branchingone branch
from amature colony
feedingpolyp
Fig. 22-5, p.356
sponges cnidarians echinodermsflatworms annelids mollusks roundworms arthropods chordates
multicelled body
radial ancestry, two germ layers
true tissues
coelom lostcoelom reduced pseudocoel
coelom reduced
moltingPROTOSTOMES
mouth from blastopore
bilateral, coelomate ancestry, three germ layers
DEUTEROSOMESanus from blastopore
Fig. 22-3a, p.355
epidermis gutcavity
organs packed betweengut and body wall
No coelom(acoelomateanimals)
Fig. 22-10, p.360
pharynx (protruded)
protonephridia
brainnerve cord
genital poreoviducttestisovary
penis
flame cell nucleuscilia
fluid filters through membrane folds
flame cell
opening of tubule at body surface
a Larvae, each with inverted scolex of future tapeworm, become encysted in intermediate host tissues (e.g., skeletal muscle)
b A human, a definitive host, eats infected, undercooked beef (mainly skeletal muscle)
proglottids
c Each sexually mature proglottid has female and male organs. Ripe proglottids containing fertilized eggs leave host in feces, which may contaminate water and vegetation.
d Inside each fertilized egg, an embryonic, larval form develops. Cattle may ingest embryonated eggs or ripe proglottids, and so become intermediate hosts
Fig. 22-11, p.361
scolex
Fig. 22-5, p.356
sponges cnidarians echinodermsflatworms annelids mollusks roundworms arthropods chordates
multicelled body
radial ancestry, two germ layers
true tissues
coelom lostcoelom reduced pseudocoel
coelom reduced
moltingPROTOSTOMES
mouth from blastopore
bilateral, coelomate ancestry, three germ layers
DEUTEROSOMESanus from blastopore
Fig. 22-5, p.356
sponges cnidarians echinodermsflatworms annelids mollusks roundworms arthropods chordates
multicelled body
radial ancestry, two germ layers
true tissues
coelom lostcoelom reduced pseudocoel
coelom reduced
moltingPROTOSTOMES
mouth from blastopore
bilateral, coelomate ancestry, three germ layers
DEUTEROSOMESanus from blastopore
Fig. 22-3b, p.355
epidermis
gutcavity
unlined body cavity around gut
Pseudocoel(pseudocoelomateanimals)
Fig. 22-5, p.356
sponges cnidarians echinodermsflatworms annelids mollusks roundworms arthropods chordates
multicelled body
radial ancestry, two germ layers
true tissues
coelom lostcoelom reduced pseudocoel
coelom reduced
moltingPROTOSTOMES
mouth from blastopore
bilateral, coelomate ancestry, three germ layers
DEUTEROSOMESanus from blastopore