Cnidarians Verse Porifera Megan Finnerty Biology 5/6
Feb 24, 2016
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 stimuliCnidarians Response
http://biodidac.bio.uottawa.ca/thumbnails/catquery.htm?Kingdom=Animalia&Phylum=Cnidaria&category=diagbw
No nervous systemCan 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 reproductionPolyps can either reproduce asexually by budding and creating another polyp or
producing a medusaThe 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 reproductionSperm released into water currents, brought to female for internal
fertilizationAsexual 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