What are the 3 main layers of a cnidarian? describe each
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Epidermis- outter layer Mesoglea- gleatinous middle layer between the epid and gastro, serves as an elastic skeleton Gastrodermis- inner cell layer that lines the gastrovascular cavity
AnemonesSymbiotic relationship with clownfish. Most are sessile when adult. Large polyps, colonial and solitaryCoralExoskeleton made of calcium carbonate. Removes CO2 from the water. Symbiotic relationship with zooxanthallaeBox jellyMost venomous animal in the world, found off the coast of Australia. Venom freezes heart in a contracted state, has eyes that can detect shapeHydrozoansA class with over 3000 marine species. Grown in colonies, feathery or bushy. Often found attached to surfacesScphozoanA class typically the largest of all jellies. Found most often in medusa form. Bell shaped used for moving and driftingAnthozoansClass that majority of cnidarians belong to this group. Only found in polyp stage. Different groups: anemones and coralsCubozaClass with approximately 20 known species. Have a cuboidal when viewed from above. Posses complex eyes that can pick up on shapesBe able to explain how and why sponges might have evolved into Cnidarians. Be able to give examples of different characteristics that they have in common as well as differences that give both Porifera and Cnidarians and evolutionary advantage.They both reproduce the same. They have the same life cycle up until a cnidarian becomes a polyp, from there cnidarians grow tentacles and are a step up from sponges. Sponges could potentially evolve into cnidarians if they kept growing past their final stage. For ex a full grown sponge continues growing and grows tentacles.Describe the life cycle of a jellyfish in a lot of detailJellyfish have a complex life cycle that includes both a sexual stage and an asexual stage. In the sexual stage, the Medusa produces gametes (eggs and sperm). Eggs fertilized by sperm develop into a larval form (planula), which attaches to a rock or the seafloor and develops into a polyp, which is the asexual stage. The polyp reproduces by budding off immature medusas, which later develop into adult medusas.
