Download Name: Blk: ______ Date: Invertebrate Comparison Chart Phylum

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Date: ________________________
Invertebrate Comparison Chart
Phylum
Sub-phylum /
Class
Example
species
Porifera
Cnidaria
Scyphozoa, Anthozoa,
Hydrozoa
Platyhelminthes
Nematoda
Annelida
Planarians, flukes,
tapeworms
Free-living /
parasitic
Hirudinea, oligochaeta,
polychaeta
Mollusca
gastropoda
bivalvia
cephalopoda
Sponges
Jellyfish, corals, hydra
Plaaria, tapeworms
Trichinella, Ascaris,
Filarial worm
Earthworms, leeches
Snails, slugs,
nudibranchs
Clams, mussels
Octopus, squid
Habitat(s)
Marine
Marine
Hydra – freshwater
Marine, terrestrial +
Internal parasites
Everywhere
+ internal parasites
Marine, terrestrial
Marine + land snails
and slugs
Marine/freshwater
marine
Body plan /
Germ layers /
Coelom?
Asymmetrical /
No germ layers /
No coelom
Radial symmetry /
2 germ layers + mesoglea /
Acoelomate
Bilateral /
3 germ layers /
Acoelomate
Bilateral /
3 germ layers /
Psuedocoleomate
Bilateral /
3 germ layers /
True coelom
Bilateral /
3 germ layers /
True coelom
Bilateral /
3 germ layers /
True coelom
Bilateral /
3 germ layers /
True coelom
Feeding and
Digestive
system
Filter feeders,
No mouth, anus
-Sting prey with
nematocysts,
-Single opening
mouth/anus
-Suck food in with
pharynx.
-Single opening
mouth/anus
Two openings mouth
+ anus.
Free-living:
decomposers
Parasitic- blood,
tissues
Two openings mouth +
anus.
Earthworms digest
soil, leeches feed on
blood
2 openings mouth +
anus.
-decomposers
2 openings mouth +
anus.
- filter feeders
2 openings mouth +
anus.
- predators
Excretion
Out of osculum,
diffusion
Solid out of mouth,
Metabolic waste by
diffusion
Solid out of mouth,
Metabolic waste by
diffusion
Circulation
No internal
transport,
Via diffusion
No internal transport,
Via diffusion
No internal transport,
Via diffusion
Solid waste out of
anus,
Metabolic waste by
diffusion
No internal
transport,
Via diffusion
Solid waste out of
anus,
Metabolic waste by
nephridia
Closed circulatory
system, blood in
vessels
Solid waste out of
anus,
Metabolic waste by
nephridia
Open circulatory
system (blood
bathes organs)
Solid waste out of
anus,
Metabolic waste by
nephridia
Open circulatory
system (blood bathes
organs)
Solid waste out of
anus,
Metabolic waste by
nephridia
Closed circulatory
system, blood in
vessels
Respiration
(obtaining O2)
Via diffusion
Via diffusion
Via diffusion
Via diffusion
Via diffusion
Marine – gills
Land - diffusion
Gills
Gills
Nervous system
/ Sensory
structures
Absent
Sensory cells (various)
-nerve net
-some jellies have
ocelli
Ocelli, sensory cells,
Anterior ganglia in
‘head’,
Nerve cords down side
Sensory cells,
Anterior ganglia.
nerve cords
Sensory cells.
‘Brain’, and ventral
nerve cords with
ganglia in each
segment
Anterior ganglia,
nervous system
sensitive to various
stimuli.
Anterior ganglia,
nervous system
sensitive to various
stimuli.
Complex brain and
nervous system,
developed eyes
Reproduction
Sexual – eggs and
sperm released
into water
Asexual –
gemmules, budding
Sexual – eggs and sperm
into water
Asexual - budding
Sexual – “penis
fencing”,
hermaphrotidic.
Asexual –
fragementation,
Sexual
reproduction,
usually internal fert.
in female.
Hermaphrodites
( sexual reproduction)
Hermaphrodites,
external
fertilization
Sexual, external
fertilization
Sexual, usually
internal fertilization
Ecological roles
/ Importance to
Humans
- toxins help
break down
shells
-habitats for
animals
coral reefs: huge
habitats for many
organisms.
-symbiotic
relationships with
animals/photosynthetic
algae
Free-living –
decomposers,
scavengers
Parasites cause
problems for
animals, pop’ns
Free-living:
decomposers,
very imp. For
nutrient cycling in
biosphere
Parasitic – can
wipe out popn’s
Important for soil,
plant growth,
nutrient/nitrogen
cycling, aeration of
soil.
Decomposers,
Food source
Food source for
many animals
Food
source,+important
predators in
ocean food web.