Cnidarians Verse Porifera

Megan FinnertyBiology 5/6

Cnidarians◦ Jellyfish◦ Hydra◦ Sea Anemones◦ Coral

Porifera◦ Sponges

Types of Organisms

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

Cnidarians Characteristics

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.

Porifera Characteristics

Paralyzes prey with tentacles and then the food falls into the mouth. It is then digested in the gastrovascular cavity

Cnidarians Feeding

http://universe-review.ca/R10-33-anatomy.htm

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.

Porifera Feeding

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.

Respiration, Circulation and Excretion

Uses the nerve net to detect stimuli

Cnidarians Response

http://biodidac.bio.uottawa.ca/thumbnails/catquery.htm?Kingdom=Animalia&Phylum=Cnidaria&category=diagbw

No nervous system

Can produce toxins instead

Porifera Response

http://mymarinebiologyhome.blogspot.com/2007/09/shape-of-life-090807.html

Uses water in the gastrovascular cavity and hydrostatic skeleton

Uses jet propulsion to move

Cnidarians Movement

http://funscubadiver.com/gallery/bonaire-giant-sea-anemone.htm http://lifestyle.iloveindia.com/lounge/jellyfish-facts-5755.html

OR

Are Sessile (live adult life stationary)

As a larva, it is carried by water currents until stationary

Porifera Movement

larva

http://www.biology.ualberta.ca/CMD/home.htm

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

Cnidarians Reproduction

http://universe-review.ca/R10-33-anatomy.htm

Both sexual and asexual reproduction

Sperm released into water currents, brought to female for internal fertilization

Asexual is by budding or gemmules

Porifera Reproduction

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

Comparisons