Cnidaria
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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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Cnidaria

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Cnidaria

Cnidaria

Jellies


Greek cnidos stinging nettle

Greek : Cnidos “stinging nettle”


Cnidaria

580 million years ago


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?


Cnidaria

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


Reproduction has sexual and asexual stages

Reproduction has sexual and asexual stages


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


L ongest animal in the world praya @ 120 ft

Longest animal in the world= Praya @ 120 ft


Anthozoa sessile polyps

Anthozoa: "sessile polyps"

No medusa stage

Symbiotic relationship with

zooxanthellae (photosynthetic algae)

Corals secrete calcium carbonate

Mesenteries

(longitudal sheets

of tissue)


Venn diagram

VENN DIAGRAM


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