PORIFERA
None
CNIDARIA

Two layers:
 Ectoderm
 Endoderm
PORIFERA
No
symmetry
CNIDARIA
Radial
symmetry
PORIFERA
CNIDARIA
Acoelomate
Acoelomate
*Acoelomate: No coelom
PORIFERA
No
digestive tract. They filter
feed instead. They rely on
maintaining a constant water
flow through their bodies to
obtain food and oxygen and to
remove waste.
CNIDARIA
Gastro
vascular (functions in
both digestion and distribution
of nutrients) with a saclike
digestive system with one
opening.
PORIFERA

None
CNIDARIA

None
PORIFERA

None
CNIDARIA

None
PORIFERA


Have a
substance called
mesohyl that
acts as an
endoskeleton;
mesohyl is
stiffened by
mineral spicules.
No appendages
CNIDARIA


Hydrostatic skeleton acts like a waterfilled balloon to support body
Some jellyfish have appendages
known as “Oral arms” that hang from
the bell near the mouth, and bring the
captured prey to the mouth.
PORIFERA

Don’t have a circulatory
system; rely on maintaining a
constant water flow through
their bodies to obtain oxygen
and to remove waste.
CNIDARIA
Cnidarians lack a circulatory system.
All the cells of cnidarians are in contact
with the water, which has all of the
oxygen and nutrients the simple animals
needs. The use for a circulatory system
is to transfer oxygen and nutrients to all
the cells of the body, and take away the
waste.
PORIFERA

Gases are exchanged with
the environment through
diffusion across individual
cell membranes
CNIDARIA

Same as porifera
PORIFERA

Sexual

 Internal, most sponges are

hermaphrodites which gives
them the ability to reproduce
with any other sponge

CNIDARIA
Asexual
 Budding- attach or separate
from parent
 Fragmentation- break off and
become cold or dry and
eventually become a new
sponge
Sexual
Asexual
 budding
PORIFERA

Reef
CNIDARIA


Fresh and salt water
Reefs