Download CHARACTERISTIC

INVERTEBRATE COMPARISON
CHARACTERISTIC
Backbone?
Blastopore becomes?
Symmetry
Earthworms
Invertebrates
Protostomes
Bilateral
Clams
Invertebrates
Protostomes
Bilateral
Type of Coelom?
Eucoelom
RESPIRATORY
No organs; exchange
gases through skin
Eucoelom shrunk to
pericardial cavity
Gills
NERVOUS
1 pair cerebral
ganglia; 1ventral
nerve cord
3 pairs ganglia; 2 pairs of
nerve cords
CIRCULATORY
CLOSED; 5 aortic
arches pump blood
OPEN; Heart pumps
hemolymph
DIGESTIVE
Crop stores, gizzard
grinds, intestine w/
typhlosole absorbs
nutrients
EXCRETORY
Nephridia release
urea through skin
Stomach grinds, digestive
gland makes bile, finishes
digestion, & absorbs
nutrients; intestine
removes feces
Kidney releases urea into
mantle cavity
Starfish
Invertebrates
Deuterostomes
Radial (adults)
Bilateral (larvae)
Eucoelom
No organs; Exchange
gases through skin gills
and surface of tube feet
Nerve ring around
mouth; radial nerves in
arms ; nerve net under
skin; multiple ganglia
OPEN; hemolymph in
coelom
no heart or blood vessels
Cardiac & pyloric digest
food; digestive glands
makes bile, finishes
digestion, & absorbs
nutrients; no intestine
No excretory organs;
nitrogen waste released
from coelom through
skin gills/tube feet
CHARACTERISTIC
REPRODUCTIVE
Fertilization
Earthworms
Sexualhermaphrodites
External
Development
DIRECT
Hydroskeleton-fluid
in coelom
SKELETAL
OTHER BODY
SYSTEMS
Clams
Sexual- 2 sexes
Internal-freshwater
External- marine
INDIRECT-has
trochophore larva
None-protective shell on
outside made of calcium
carbonate
Starfish
Sexual-2 sexes
& Asexual
External
INDIRECT- has
bipinnaria larva
ENDOSKELETON made
of calcium carbonate
plates called ossicles;
connect to spines on
surface
Water vascular system
only in echinoderms
provides water pressure
to run suction cup tube
feet