Transcript Cnidaria Verse Porifera

Megan Finnerty
Biology 5/6

Cnidarians
◦
◦
◦
◦
Jellyfish
Hydra
Sea Anemones
Coral

Porifera
◦ Sponges






Symmetrical
Multicellular, few tissues, some organelles
Contains internal cavity and a mouth
Net like nervous system
Aquatic environments
Minimal skeleton, of chifton or calcium
carbonate






No definite symmetry.
Body multicultural, few tissues, no organs.
Has no nervous system.
Lives in aquatic areas.
All are filter feeders.
Often have skeleton of spicules.
Cnidarians Feeding
Paralyzes prey with tentacles and then the food falls into the mouth. It is then
digested in the gastrovascular cavity
http://universe-review.ca/R10-33-anatomy.htm
Porifera Feeding
Takes the Incoming water and filters it. Food particles are then trapped by the
choanocytes. Food is digested and then passed along to the archaeocyte cells.
http://www.biologie.uni-hamburg.de/b-online/library/onlinebio/BioBookDiversity_7.html

Cnidarians
◦ Following the
digestion, nutrients
are transported by
diffusion.
◦ Waste is through the
body walls by
diffusion.

Porifera
◦ As the water moves
through the body
cavity, oxygen is
dissolved.
◦ Waste is diffused.
Cnidarians Response
Uses the nerve net to detect stimuli
http://biodidac.bio.uottawa.ca/thumbnails/catquery.htm?Kingdom=Animalia&Phylum=Cnidaria&category=diagbw
Porifera Response
No nervous system
Can produce toxins instead
http://mymarinebiologyhome.blogspot.com/2007/09/shape-of-life-090807.html

Uses water in the
gastrovascular
cavity and
hydrostatic
skeleton
http://funscubadiver.com/gallery/bonaire-giant-sea-anemone.htm

O
R
Uses jet propulsion
to move
http://lifestyle.iloveindia.com/lounge/jellyfish-facts-5755.html


Are Sessile (live
adult life stationary)
As a larva, it is
carried by water
currents until
stationary
larva
http://www.biology.ualberta.ca/CMD/home.htm
Cnidarians Reproduction
Both Sexually and Asexually reproduction
Polyps can either reproduce asexually by budding and creating another polyp or
producing a medusa
The Medusa(male) releases the sperm in open water and fertilizes the egg
http://universe-review.ca/R10-33-anatomy.htm
Porifera Reproduction
Both sexual and asexual reproduction
Sperm released into water currents, brought to female for internal fertilization
Asexual is by budding or gemmules
http://authors.ck12.org/wiki/index.php/Simple_Invertebrates:_Sponges,_Cnidarians,_and_Worms



Both are invertebrate
Both are protostomes
Poriferia have no symmetry while Cnidarians
have radial symmetry