| The strobila may look like a stack of saucers, the saucers being the immature medusae called ephyrae. |
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| There are three subgroups within the cnidarians that have medusae, cubozoans, hydrozoans, and scyphozoans. |
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| The groups Hydrozoa, Scyphozoa and Cubozoa all are generally characterized as having polyps and medusae. |
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| It is possible that fluorescence in these medusae represents a daylight functional analog of bioluminescence. |
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| Finally solitary polyps or medusae may clone to produce more of their kind. |
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| However, a strobilation event in November 1998 prevented the complete loss of medusae. |
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| In polyps, medusae, and worms, all longitudinal and circumferential muscles attach to the thin body wall over a wide area. |
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| Noteably, all epipelagic, midwater, and deepsea medusae have very simple, reduced, or absent ocelli. |
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| In 1990, M. medusae reappeared in Hamilton and has persisted there on several P. deltoides x P. trichocarpa cultivars. |
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| 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. |
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| In at least some medusae, the circular muscles, which do most of the work of swimming, are striated. |
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| Scyphozoan medusae differ from those of hydrozoans in lacking a velum. |
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| Gorgonocepahlus caput medusae, lives 290 metres down in the Skagerak region off the Norwegian coast. |
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| Before long, similar green proteins were detected in many bioluminescent coelenterates including various medusae, apparently all luminescent hydroid polyps, and a few others. |
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| He had shown that hydroid jellyfish known as naked-eyed medusae reproduce not only by spewing eggs, but also by asexual budding, which he found marvelous to behold. |
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| Predation by an abundance of medusae on zooplankton and ichthyoplankton could affect the North Sea ecosystem through top-down and bottom-up mechanisms. |
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| Cnidarians are incredibly diverse in form, as evidenced by colonial siphonophores, massive medusae and corals, feathery hydroids, and box jellies with complex eyes. |
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| Most medusae are slow-swimming, planktonic animals. |
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| Cubozoans have medusae commonly known as box jellyfish, from their shape. |
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| Circulatory shunts may develop as a result of portal hypertension and these can lead to the formation of oesophageal varices, caput medusae or to haemorrhoids. |
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| A few species can produce new medusae by budding directly from the medusan stage. |
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| A few omit the planula, polyp and ephyra phases and produce new medusae directly from eggs. |
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| This new capability has revealed a remarkable diversity of medusae, ctenophores, and siphonophores restricted to the midwater environment. |
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| Most species of cubozoans, hydrozoans, and scyphozoans pass through the medusoid and polypoid body forms, with medusae giving rise sexually to larvae that metamorphose into polyps, while polyps produce medusae asexually. |
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| Studies on morphology, DNA sequences and pathogenicity revealed the occurrence of a natural hybrid of Melampsora medusae and M. occidentalis which was described and called Melampsora x columbiana. |
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| German biologist Ernst Haeckel popularized medusae through his vivid illustrations, particularly in Kunstformen der Natur. |
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| Zooplankton, including cladocerans, copepods and the rotifer Keratella, were present in high numbers throughout the study and were still abundant when the medusae disappeared. |
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| A recent study tracking swimming jellyfish revealed that these medusae can detect marine currents and swim against the current to congregate in blooms. |
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| Also imaged were a variety of invertebrate plankters, ranging from copepods and larvaceans to ctenophores and medusae to invertebrate larval types, such as echinoderm pluteus. |
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| Sketch the Obelia Cnidaria medusa Obelia Medusae slide and label the bell, Deerhorn coral skeleton mouth, and tentacles. |
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| Medusae are carnivorous, feeding on plankton, crustaceans, fish eggs, small fish and other jellyfish, ingesting and voiding through the same hole in the middle of the bell. |
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