kingdom: animalia, phylum: cnidaria · kingdom: animalia, phylum: cnidaria tentacle phraynx gonads...
TRANSCRIPT
Kingdom: Animalia, Phylum: Cnidaria
Tentacle
Phraynx
Gonads
Column
Septum
Cinclide (pore)
Acontium
(defensive stinging tentacle)
Pedal disk
Oral disk
Mouth
Collar
Stomata
Septum
Retractor muscle
Cnidaria is a phylum containing over 9000 species found only in aquatic and mostly
marine environments. “Cnidaria” comes from the Greek word "cnidos," which means
nettle.
There are two major body forms among the Cnidaria - the polyp (sea anemones and
corals) and the medusa (jellyfish).
There are four major groups of cnidarians:
• Anthozoa: corals, anemones, and sea pens
• Cubozoa: box jellies
• Hydrozoa: siphonophores, hydroids, fire corals
• Scyphozoa: jellyfish
Sea anemone polyp anatomy
Cnidaria have stinging
cells called nematocysts
that are used for defence
or capturing prey.
When the trigger is touched
the nematocyst tube springs
out and injects venom into
the prey.
Red, or southern, or bubble, or
mulberry anemone
Phlyctenanthus australis
Waratah anemone
Actinia tenebrosa
(pronounced “Nye-dare-ree-ah”)
Sea anemones sometimes found in the touch tank
Image by Byron Inouye manoa.hawaii.edu