Cnidarians Animals with Stinging Tentacles Classes Jelly Fish -Scyphozoa Sea Anemone-Anthozoa Coral-Anthozoa Portuguese Man of War –Hydrozoa Box jelly- Cubozoa
Cnidarians Two Cell layers Saclike digestive tract Radial Symmetry-_similar parts surrounding a central axis Lack a brain, but have a nerve net Catch their food- they are not filter feeders Sometimes they are attached to a substrate and sometimes they are free swimming
Polyp- attached to a substrate Example- corals,sea anemones, jellyfish Cnidarians come in two forms Polyp- attached to a substrate Example- corals,sea anemones, jellyfish Medusa –free swimming Example- Jellyfish
Cnidarians Both forms are surrounded by Tentacles Which have Cnidoblasts-Stinging Cells with Nematocysts inside That are used for Protection Catching Prey
Scyphozoa Jelly Fish Size- Most are 1-16 inches Can be 1 inch to 200 feet long Predators Sea Turtles Banner Fish Arrow Crab Snails
Predators of Jellyfish Sea turtles mistake plastic bags for food
Banner fish eating a jellyfish
Arrow crab eating a jellyfish
Yes, this snail is eating a dead Jellyfish
Moon Jellyfish Most common on LI Up to 18 in. wide Sticky to help catch prey Circles in middle are the gonads (sex organs) Don’t do much harm By the time they reach the beach they are harmless because they lost their tentacles.
Moon Jelly
Moon Jelly Moon Jellyfish, Aurelia aurita at MarineBio.org
Cubozoa Box Jelly
Box Jelly Pale blue and transparent and box shape Also called the Sea wasp Pale blue and transparent and box shape this jellyfish can see - 24 eyes 15 tentacles from each corner -60 tentacles found in N. Australia. Live up to 1 year this jellyfish swims, it does not drift powerful venom that instantly kills its prey. Attacks the nervous system. Humans have had heart attacks or gone into shock and drown before reaching the shore. If you survive attack then you will feel pain for weeks and have scar damage. Sea turtles eat them. Not affected by sting
Box Jellyfish
Box jelly sting Fatal sting
Cannonball Jelly
Sea Nettle Grows up to 12 feet long Reddish-maroon markings Found in Atlantic Ocean from Massachusetts to Florida and the Gulf of Mexico. Also in Pacific from Alaska to Southern California
Lions Mane Largest in the world Found in Cold Northern Waters –Atlantic Ocean from Arctic to Gulf of Mexico Also Pacific from Alaska to Southern California Pink in color 8-200 feet long Up to 7 ft wide Powerful Sting- tentacles can detach and still sting for months. http://www.youtube.com/watch?v=-mRZwjfTo5I
Scuba diver with a lions mane can weigh up to 450 pounds and 6 Scuba diver with a lions mane can weigh up to 450 pounds and 6.5 ft in width
Jellyfish Invasion GIANT JELLYFISH PICTURES: Japan's Nomura Invasion
Anthozoa Corals and Sea Anemones Polyps-attach to substrate Called Flower Animals They are Larger and live Alone Corals Polyps-attach to substrate Called flower Animals They are smaller and live in colonies
Sea Anemones and Corals Anthozoa is a class in the phylum Cnidaria that includes the sea anemones, corals, sea pens and sea fans
Different types of Coral
Northern Coral and Rose Coral
Sea Fans
Giant Sea Anemone This Can grow up to 10 inches in diameter They also have nematocysts Can devour a giant crab and spit out the shell in 15 minutes ]can compare to a human eating a whole chicken in 15 minutes Found along Pacific coast from Alaska to Baja
Sea Anemone with a clownfish A Symbiotic relationship
Sea Anemone
Hydroids Portuguese man of war
Portuguese Man of War Found in Pacific, Indian and North Atlantic Gulf Stream Not a jelly because it is a colony Body is pink or purple and translucent Body is on top and tentacles below water Tentacles range from 30-150 feet Sails on top of the water and is driven by Wind Sting can be serious but usually never deadly
Man of Wars found in Florida
Comb Jellies This is Not a Jellyfish They have eight rows of long fused cilia that look like combs. They swim on or near surface of water They light up when disturbed- Bioluminescent