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Cnidaria. Jellies. Greek : Cnidos “stinging nettle”. 580 million years ago. HOW ARE THEY SIMILAR TO PHYLUM PORIFERA?. No digestive system No circulatory systems Both have 2 cell layers Some are sessile . H ow are they different from Phylum Porifera?. Cells bound by inter-cell

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Presentation Transcript
cnidaria

Cnidaria

Jellies

how are they similar to phylum porifera

HOW ARE THEY SIMILAR TO PHYLUM PORIFERA?

No digestive system

No circulatory systems

Both have 2 cell layers

Some are sessile

h ow are they different from phylum porifera
How are they different from Phylum Porifera?

Cells bound by inter-cell

connections

Muscles

Nervous system

Have special cells called

CNIDOCYTES

Some are mobile

main charcteristics
Main Charcteristics
  • What type of symmetry do they have?
what are their stinging cells called what are they used for
What are their stinging cells called? What are they used for?
  • Have tentacles with stinging cells called____________________.
  • What are they used for?
slide8
Occur in 2 basic forms

1. sessile________ 2. free floating__________

h ow many tissue layers
How many tissue layers?

tissues composed

of 95% or

more water

How do they move?

http://www.pbs.org/kcet/shapeoflife/episodes/move_explo1.html

homework
Homework:

Jelly Life Story

http://bcs.whfreeman.com/thelifewire/content/chp32/32020.html

classification
Classification

Kingdom Animalia

Phylum Cnidaria

Class Cubozoa

Class Hydrozoa

Class Scyphozoa

Class Anthozoa

cubozoa box jellies
Cubozoa: "box jellies"

Mostly found in tropical waters

Actively hunts prey

Four evenly spaced out tentacles

Extremely powerful venom

Well-developed, complex eyes-24 in all

hydrozoa polyp colonies
Hydrozoa: "polyp colonies"

Live in colonies

Colonies have separate

sexes

Some polyps asexually

reproduce by budding

Polymorphism: specialized

polyps

scyphozoa true jellies
Scyphozoa: "true jellies"

Mostly exist as a medusa

Found at all depths

all over the world

Four oral arms

Contract muscles

to move

anthozoa sessile polyps
Anthozoa: "sessile polyps"

No medusa stage

Symbiotic relationship with

zooxanthellae (photosynthetic algae)

Corals secrete calcium carbonate

Mesenteries

(longitudal sheets

of tissue)

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