Where are Scyphistoma found?

A jellyfish contracting its body. Free-swimming scyphozoan jellyfish occur in all oceans and include the familiar disk-shaped animals that are often found drifting along the shoreline. Most live for only a few weeks, but some are known to survive a year or longer.

What is strobilation in jellyfish?

The process by which new medusae are produced is called ‘strobilation’ and involves metamorphosis of the end of a scyphistoma into an ‘ephyra’, an immature medusa, that subsequently detaches and swims away. The ephyra subsequently develops into a mature medusa over a period of weeks to months.

Are scyphozoa polyps?

Scyphozoan polyps and medusae exhibit no cephalization and contain no brain, but in some species, light-sensitive eyespots are located along the bell margin of the medusa. Scyphozoan medusae differ from those of hydrozoans in lacking a velum. A scyphomedusa locomotes by contracting and relaxing muscles of the bell.

What is jellyfish diet?

Jellyfish eat many different types of things, such as small plants (phytoplankton), copepods (crustacean zooplankton), fish eggs and other small fish called larvae; they also eat the planktonic eggs and young stages (also called larvae) of many different kinds of marine animals. Some jellyfish even eat other jellyfish!

Are scyphozoa harmful to humans?

Scyphozoan stings may lead to local and systemic reactions via toxic and immunological mechanisms; some of these reactions may represent a medical emergency. Species-specific differences may hinder the identification of treatments that work for all stings.

How does Strobilation occur?

Strobilation does not happen periodically, but is thought to be induced by external stimuli, such as iodine, light regime, temperature, or food availability.

Where does Strobilation occur?

Complete answer: The moon jellyfish is known as Aurelia aurita that reproduces both sexually and by strobilation. This latter process takes place during the colonial polyp stage and develops either polyps or juvenile Medusae called ephyra. Strobilation tends to take place at specific periods, typically early spring.

What do all scyphozoa have in common?

Scyphozoans share a number of attributes with other cnidarians: (1) they typically possess tentacles, (2) their symmetry is radial, (3) the body wall consists of an outer epidermis and inner gastrodermis, separated by a layer of jelly-like mesoglea, (4) the mouth is the only opening to the digestive system, (5) …