Scyphozoans (Chapter 8)

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Scyphozoans (Chapter 8)

Reproduction;Medusae (sexual stage) release gametes into the water for fertilization.Planula larvae settle, grow into polyps, and reproduce medusa-like buds asexually


Feeding Behaviors; Scyphozoans are carniverous. Some are active predators, and others are filter-feeders. They mostly eat plankton and the larvae of fish and other organisms. Predatory scyphozoans catch prey using their tentacles, which are armed with touch-triggered cnidoblasts that release venemous nematocysts. The nematocysts pierce the prey and immobilize it, and the jellyfish then uses its oral tentacles to bring the food into their mouth.

Characteristics and stinging information; Scyphozoans exhibit the main characteristics of cnidarians. They have radial symmetry and are diploblastic, meaning that their body wall consists of the outer epidermis (ectoderm) and the inner gastrodermis (endoderm), which are separated by mesoglea. They have nematocysts, which are characteristic of the phylum. They undergo alternation of generations, with the medusa form being dominant. Scyphomedusae are the "jellyfish" with which most people are familiar.The jellies drift along in the water generally with the mouth and tentacles pointing down. We call this a medusoid body form. Some jellies are extremely venomous to humans. Some can even kill people with enough contact of tentacle on bare skin, but most are not that dangerous, producing only a mild rash similar to that caused by poison ivy.

Class Scyphozoa

Habitat; Scyphozoans are found in all oceans from the cold Artic to the warm tropical waters of the Caribbean. the majoirty of the species are located close to the equator in the warm tropical and subtropical waters.



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