Phylum Porifera
Sponges
Phylum Cnidaria
Jellyfish, corals .....
●Don’t forget – sponges are
animals and belong to the
Animal Kingdom
1. Multicellular
2. No organs or body systems
3 . Cellular digestion
(heterotrophic)
4. Asymmetry
Sponges
are
SESSILE –
they do not
move
They obtain
food by
FILTER
Reproduce sexually (sperm and eggs)
Reproduce asexually (regeneration)
Skeleton composed of spongin (soft)
and spicules (hard)
Sponge Anatomy
Amebocytes - cells
within the sponge
that move around
supplying nutrients
and taking away
waste
CHOANOCYTES – collar cells
· layer of cells with flagella
· the movement of the flagella keeps
a water current going in the sponge
· food vacuoles in the collar cells
digest plankton and other small
organisms (filter feeder)
Cnidarians - jellyfish, coral, hydra,
sea anemone
*Named after the stinging cells found on
their tentacles called CNIDOCYTES
Characteristics of Cnidarians
· Tentacles
· Cnidocytes (stinging cells)
· Nematocysts
(barbs)
· Gastrovascular
cavity (digestion)
Most Cnidarians have radial symmetry
Cnidarians have two body forms:
polyp (vase shaped)
medusa (cup shaped)
Portuguese Man of War - cnidarian that floats in the
water and has long tentacles
Video: Jellyfish
Scene from Nemo
The Hydra is a freshwater cnidarian we will study in
the lab
What kind of symmetry does hydra have?
Is it a medusa or a polyp?
Video of hydra at
http://www.microscopyu.com/moviegallery/pondscum/hydra/
Hydra Anatomy (printable)
WORD BANK
Gastrovascular cavity
Tentacle
Cnidocyte
Ectoderm
Endoderm
Mesoglea
Ovary/Teste
Bud
Nematocyst
Mouth
Basal Disk
Coral Reefs are made from the skeletons of
cnidarians
Multimedia
Sponge Images and Videos http://www.junglewalk.com/video/Sponge-movie.htm
Cnidarian Images and Videos http://www.junglewalk.com/video/Coelantrate-movie.htm
General Invertebrate Movies at National Geographic
--- really good video on the portuguese man of war (under
invertebrates)
Hydra Video at http://www.schooltube.com/video/55045/Hydra