Jellyfish Cnidarians Presentation by: Randy Pickett
Classification • Kingdom – Animalia • Phylum – Cnidaria • Corals • Jellyfish • Sea Anemones • Hyrdozoans • Class – Scyphozoa • Jellyfish • Many Orders, Families, Genera and Species
Habitat • Inhabit all the marine waters of the world • All four main oceans • Can be found in freshwater • Freshwater lakes • Reservoirs • Man-made impoundments • Water-filled gravel pits • Rock quarries • Algae-filled ponds • Rivers
Feeding Habits • They eat plankton • Large amounts of crustaceans • Capcodes – tiny marine animals • feeding on these creatures in huge quantities, and thus maintaining a balance in the food chain.
Reproductive Habits • Two body forms in life cycles • Polyp – asexual & sessile • Medusa – dioecious & free swimming • Form by budding from wall of polyp
Adaptations • More than 200 species – all taken on different adaptations to suit the environment to live • Warm • Cold • Shallow • Deep sea • Jellyfish are made up of 95% water and 5% solid material • Water to float • Bell shaped or umbrella shaped • Some are free swimming • Medusa – free swimming • Polyp – Attach themselves to ocean walls • Catching prey – millions specialized stinging cells • Nematocysts
Jellyfish Tentacles • Stings can be serious/fetal • Symptoms of stings • Burning sensation • Redness and welts • Swelling of the lymph nodes • May induce anaphylactic shock
Stung by a Jellyfish? • Immediately alert the lifeguard on duty, who is trained in first aid and can call for assistance if necessary. • Brush off any tentacles using an object. • Do not use your hands • Pour vinegar over the wound to disable the stinging cells. If vinegar is not available, rinse the wound with sea water or saline solution. • May reduce the chance of the cells continuing to sting. • Ice the area to minimize pain.
Recent discoveries - Turritopsis nutricula “The world's only 'immortal' creature” • In February 2009 The National Geographic News reported that the Turritopsis nutricula (or Immortal Jellyfish) may be the worlds ONLY immortal creature. • Most jellyfish die after propagating but T. nutricula reverts back to it’s juvenile polyp state. It is also fully capable of rejuvenating itself. Meaning that the Turritopsis can continually repeat this cycle and live forever. Scientists are now studying the Turritopsis to study the effects of cell development and rejuvenation. • This jellyfish is only 5 mm in diameter, mature asexually, and are very predatory.
References • http://www.enchantedlearning.com/subjects/invertebrates/jellyfish/Jellyfishcoloring.shtml • http://www.iucnredlist.org/apps/redlist/images/range/thumbs/11534.png • http://www.jellyfishfacts.net/jellyfish-habitat.html • http://www.lifespan.org/services/emergency/articles/watersafe/jellyfish.htm • http://www.timesonline.co.uk/tol/news/science/article5594539.ece • http://news.nationalgeographic.com/news/2009/01/090130-immortal-jellyfish-swarm.html