Cnidaria
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Cnidaria. Hydras, anemones, jellyfish, corals. Key Characteristics. Lives both in salt and fresh water Simple nervous system’ Stinging cells Radial Symmetry Two embryonic cell layers . Anatomy. Nerve net- areas densely pact with nerve cells Statocyst - an organ for movement

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Cnidaria

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Cnidaria

Cnidaria

Hydras, anemones, jellyfish, corals


Key characteristics

Key Characteristics

  • Lives both in salt and fresh water

  • Simple nervous system’

  • Stinging cells

  • Radial Symmetry

  • Two embryonic cell layers


Anatomy

Anatomy

  • Nerve net- areas densely pact with nerve cells

  • Statocyst- an organ for movement

  • Ocelli- simply sensory organ

  • Two-way digestion- food enters and leaves same cavity

  • Hydrostatic Skeleton- muscle changes with liquid


Anatomy cont

Anatomy cont.

  • Tentacle- surrounds mouth to aid food captures

  • Nematocyst- Harpoon like stinging cells

  • Mouth- takes in food and removes waste

  • Gastrovascular cavity- distributes digested nutrients

  • Bud- group of cells that grows into new organism


Digestion

Digestion

  • Two way Digestion

  • Mouth also anus

  • Gastrovascular cavity digests and distributes food

  • Waste pushed out mouth

  • Tentacles aid in releasing waste


Respiration

Respiration

  • Breath through diffusion

  • Oxygen obtained through water

  • Diffuses oxygen higher to lower concentration

  • Diffuses in gastrovascularcavity

  • Possible through thin cell layers


Internal transport

Internal Transport

  • Gastrovascular cavity breaks down particles

  • Cells surrounding cavity absorb

  • Nutrients distributed by cells

  • Thin cells create semipermeable body

  • Unused particles leave through anus


Excretion

Excretion

  • Gaseous wastes eliminated by diffusion

  • Dissolved wastes leave through diffusion

  • Waste created in gastrovascularcavity

  • Undissolved waste leaves through anus

  • Waste is taken in and leaves through mouth


Response

Response

  • Nematocyst defends animal

  • Nerve nets aid in response

  • Ocelli

  • Does not have brain or eyes

  • Nematocyst located all over


Movement

Movement

  • Hydrostatic skeleton

  • Moves with muscle contractions

  • Shape changes depending on fluid

  • Without liquids there is no movement

  • Expelling liquids propels movement


Reproduction

Reproduction

  • Both asexual and sexual reproduction

  • Budding creates genetic clone

  • Sperm and eggs are released in water

  • Combined in water create zygote

  • Zygote settles and grows into adult polyp


Examples

Examples

  • Cubozoa- box jellyfish

  • Scyphozoa- moon and purple jellyfish

  • Anthozoa- anemone, coral

  • Hydrozoa- hydra, Portuguese man of war

  • Divided into fresh and salt water groups


Facts

Facts

  • 10,000 different species

  • 130 species in Sydney Harbor

  • Only two are dangerous to humans

  • Comes from Greek cnidosor stinging nettle

  • Have no developed organs


Works cited

Works Cited

  • http://classconnection.s3.amazonaws.com/556/flashcards/1811556/gif/cnidaria_hydra1365168401629.gif

  • http://library.thinkquest.org/28751/review/animals/2.html

  • http://www.vattenkikaren.gu.se/fakta/arter/cnidaria/overcnid/nass04e.html

  • http://www.ncbi.nlm.nih.gov/pubmed/7833621

  • https://www.boundless.com/biology/the-musculoskeletal-system/types-of-skeletal-systems/hydrostatic-skeleton-exoskeleton-and-endoskeleton/

  • http://www.angelfire.com/mo2/animals1/phylum/jellyfish.html

  • http://science.kennesaw.edu/~jdirnber/Bio2108/Lecture/LecBiodiversity/33_Labeled_Images/33_06HydraCnidocyte-L.jpg

  • http://upload.wikimedia.org/wikipedia/commons/3/32/Marrus_orthocanna_crop.jpg

  • https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRAIwYYk21MD6R0-MTzEXMwq2mdbzM18Af9Dc6sxswrWOb1mODMsQ

  • http://cnidarianh.blogspot.com/2007/02/feeding-respiration-excretion.html

  • http://w3.shorecrest.org/~Lisa_Peck/MarineBio/syllabus/ch7invertebrates/Invertwp/invert_wp_05/cnidaria/miles1/Cool.htm

  • http://www.mesa.edu.au/cnidaria/images/jelly_life-cycle.jpg

  • https://lh4.googleusercontent.com/-nv2CohpE238/TYumw6y9wHI/AAAAAAAAJ-A/X-wIl_VNczQ/s1600/Picture%2B14.png

  • http://ichef.bbci.co.uk/naturelibrary/images/ic/credit/640x395/c/cn/cnidaria/cnidaria_1.jpg


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