What are Cnidarians? Invertebrate animals that use stinging cells to capture food and defend themselves.

What are Cnidarians?

Invertebrate animals that use stinging cells to capture food and

defend themselves.

Cnidarians Body Structures

Polyp - vaselike shape and usually adapted for a life attached

to an underwater surface.Medusa - a bowl shape and

adapted for a free-swimming life.

How cnidarians obtain food?

A stinging cell containing a thread with spines is shot into prey. Some spines contain venom.

When prey is helpless, cnidarians use tentacles to pull prey into

their mouths.

Anemone eating

http://www.youtube.com/watch?v=ctqvqES1PE8&feature=related

http://www.youtube.com/watch?v=o1A5acWEERA&feature=related





Clown fish and anemone

http://www.youtube.com/watch?v=NtfQ3aIBpGY&feature=related

http://www.youtube.com/watch?v=I089Tw7Fk_A&feature=related





How do cnidarians move?

A nerve network, not nervous system, conducts signals from sensory cells to muscle cells allowing them to respond to

danger and prey.


Video

http://video.google.com/videoplay?docid=7266910887321012084&ei=VJQrS9bXL4vGqwKqyvjKBQ&q=jellyfish+swimming&hl=en&view=3&client=firefox-a#http://video.google.com/videoplay?docid=7266910887321012084&ei=VJQrS9bXL4vGqwKqyvjKBQ&q=jellyfish+swimming&hl=


video

http://video.google.com/videoplay?docid=-5050682637491353373&ei=ppcrS6KJJpfWrALq8fnOBQ&q=anemone&hl=en&view=3&client=firefox-a#docid=3287056499784996685

How do cnidarians reproduce?

Sexual – Some species have both sexes, some are male and female.

Asexual – Polyps are asexual, some bud similarly to sponges

some pull apart.

How do cnidarians reproduce?

video

http://www.youtube.com/watch?v=sPwi2QcLKao&NR=1

Reproduction

http://www.youtube.com/watch?v=u8LGZaezpV8&feature=related



Medusa life cycle

What are Cnidarians? Invertebrate animals that use stinging cells to capture food and defend themselves.

Documents