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Phylum
Symmetry
Method of Obtaining
Food
Filter feeder
Method of
Obtaining O2
Diffusion
Method of
Reproduction
Internal or
external fert.
Vertebrate or
Invert.
Invertebrate
Habitat
Unique
Porifera (sponges)
Asymmetry
Mostly marine,
shallow H2O
Radial
Hunt with nematocysts on
tentacles
Diffusion
Invertebrate
Marine
Platyhelminthes
(flatworms)
Bilateral
Diffusion
Invertebrate
Nematoda
(roundworms)
Bilateral
Pharynx secretes
digestive enzymes, eats
dead or slow organisms
Sucked in by pharynx
Medusa release
gametes, ext.
fert.,polyp buds
Fission; exchange
sperm, internal
fert.
Sexual
Brightly colored,
hermaphrodites, no
tissues or organs
2 cell layers, one body
opening, have tissues
Cnidaria (jellyfish, sea
anenomes, corals)
Most in a host,
some marine and
fresh H2O
Everywhere
Mollusca (bivalves
[clams], gastropods
[snails], cephalopods
[octopus])
Bilateral
B: filter feeding
G: scraping w/ radula
C: hunting
B: gills
G: gills/ lungs
C: gills
B & G: ext. fert
C: int. fert.
Invertebrate
B: marine
G: everywhere
C: marine
Annelida (segmented
worms [earthworms,
leeches, tube worms])
Bilateral
From soil, leeches suck
blood, some marine worms
filter feed
Diffusion
Int fert in some,
ext fert in some
Invertebrate
Everywhere
except polar and
desert
Arthropoda (insects,
arachnids, crustaceans)
Bilateral
I: nectar, blood, leaves
A: webs, hunting
C: hunting, filter feeding
I: spiracles,
tracheal tubes
A: book lungs
C: gills
I: int. fert.
A: int. fert.
C: int./ext. fert.
Invertebrate
Everywhere
Echinodermata
(starfish, sea
cucumbers, sea urchins)
Chordata (sea squirts)
Radial (adult),
bilateral
(larvae)
Bilateral
Hunting, grazing
Tube feet
Asexual; sexual –
int. and ext. fert.
Invertebrate
Marine
Filter feeding with gill
slits
Gill slits
Ext. fert.
Invertebrate
Marine
Diffusion
Invertebrate
Parasitic, acoelomate,
some extracellular
digestion
Hydrostatic skeleton,
parasitic, two body
openings
B: 2 shells, muscular
foot; G: some w/ 1
shell, muscular foot
C: closed circ. system,
suckers on tentacles,
beaklike mouth
Have complex organ
systems (muscular,
digestive, circ.)
I: only inverts that can
fly, compound eyes,
metamorphosis
A: simple eyes, spin
silk, venom
C: compound eyes,
mandibles for chewing
Tube feet, spiny skin,
water vascular system,
regeneration
Notochord, dorsal
nerve cord, gill slits,
muscle blocks