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This article is about the aquatic animal-form. For similar animals, see gelatinous zooplankton. For other uses, see Jellyfish (disambiguation). Jellyfish, also known as sea jellies, are the medusa -phase of certain gelatinous members of the subphylum Medusozoa, which is a major part of the phylum Cnidaria.
Jellyfish, any planktonic marine member of the class Scyphozoa (phylum Cnidaria), a group of invertebrate animals composed of about 200 described species, or of the class Cubozoa (approximately 20 species). Learn more about the characteristics and natural history of jellyfish in this article.
Jellyfish have drifted along on ocean currents for millions of years, even before dinosaurs lived on the Earth. The jellylike creatures pulse along on ocean currents and are abundant in cold and warm ocean water, in deep water, and along coastlines. But despite their name, jellyfish aren't actually fish—they're invertebrates, or animals with no backbones.
3 de dic. de 2020 · Jellyfish, also known as jellies, are fascinating animals that spend their lives floating in the oceans. Unlike their name suggest, jellyfish are not really fish as they lack a backbone. In fact, these animals are actually invertebrates and they are more closely related to corals, sea anemones, and sea whips than fish.
4 de oct. de 2018 · Jellyfish 101 | Nat Geo Wild. How much do you really know about jellyfish? Given their diverse evolutionary history, jellies exhibit a fantastic range of shapes, sizes, and behaviors.
13 de dic. de 2019 · Fast Facts: Jellyfish. Scientific Name: Cnidarian; scyphozoan, cubozoan, and hydrozoan. Common Name: Jellyfish, jellies. Basic Animal Group: Invertebrate. Size: Bell diameter of two-tenths of an inch to over six and a half feet. Weight: Under an ounce to 440 pounds. Lifespan: Vary between a few hours to a few years.
29 de oct. de 2009 · Jellyfish aren’t fish but invertebrates, animals that lack backbones and even brains. Yet 30,000-odd species do far more than survive—they thrive in ocean waters the world over.
Discover facts about gelatinous jellyfish, including what they eat, how they move and the clever stinging adaptation that has helped them flourish for millions of years. Jellyfish are older than the dinosaurs.
19 de oct. de 2023 · Jellyfish 101. How much do you really know about jellyfish? Given their diverse evolutionary history, jellies exhibit a fantastic range of shapes, sizes, and behaviors. Learn all about these squishy, brainless, beautiful creatures.
jellyfish, Any of about 200 described species of free-swimming marine cnidarian s (in the classes Scyphozoa and Cubozoa), many of which have a bell-shaped body. The term is also frequently applied to other similar cnidarians (e.g., Portuguese man-of-war) and some unrelated forms (e.g., ctenophore s and salps).
