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Ephyra |
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ephyra [′e·fə·rə]
(invertebrate zoology) A larval, free-swimming medusoid stage of scyphozoans; arises from the scyphistoma by transverse fission. Also known as ephyrula. Ephyra the larva of most coelenterates of the class Scyphozoa. The larvae are formed asexually by means of transverse fission of the polyploid generation—the scyphistoma. The edge of the umbrella forms eight double lobes. Tentacles and oral lobes are absent. The digestive system is rudimentary: in addition to the stomach, there are only two rudiments of radial canals. The youngest ephyrae are transparent and reach several mm in diameter. Transformation into an adult jellyfish is accompanied by rapid growth. The edge of the umbrella becomes more regular, and a complex gastrovascular system, lateral tentacles, and the rudiments of sex glands develop. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | After SLS-1 returned to Earth, Spangenberg and her co-workers examined the jellyfish ephyrae that had developed in space. |
ephyrae |
Ephratah Ephrath Ephrayim Ephrayim EPHRC Ephree Ephrin Ephron EPHRP EPHRS EPHRU Ephrym Ephrym EPHS EPHSO EPHT EPHTA Ephtanese Ephtanese Ephthalites EPHTI EPHTN EPHTP EPHU EPHX Ephydridae Ephydridae Ephyra Ephyra ephyrae EphyreEphyre ephyrula Ephysema Ephysema Ephysema ePhysician EPI EPI EPI EPI Épi Épi Épi Epi (island) Epi isomer Epi isomer Epi pen epi spiral epi- epi- epi- epi- Epi-pen epi-sick Epia EPIAFS EPIAM epiandrosterone epiandrum | |||||||
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