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Spotted jellies swimming in a Tokyo aquarium. 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 are mainly free-swimming marine animals with umbrella-shaped bells and trailing tentacles, although a few are anchored to the seabed by stalks rather than being mobile.
Jun 20, 2024 · 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.
Oct 4, 2018 · Learn fascinating facts about jellyfish, their evolution, diversity, and behaviors, from Nat Geo Wild experts. Watch Jellyfish 101 now.
Oct 29, 2009 · Jellyfish. 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.
Apr 8, 2022 · 4. Jellyfish Are 98% Water . The human body is composed of 60% water and the jellyfish's 98%. When they wash ashore, they can disappear after just a few hours, their bodies promptly evaporating ...
Jellyfish have no brain, heart, bones or eyes. They are made up of a smooth, bag-like body and tentacles armed with tiny, stinging cells. These incredible invertebrates use their stinging tentacles to stun or paralyse prey before gobbling it up.. The jellyfish’s mouth is found in the centre of its body.
Dec 13, 2019 · Jellyfish come in a wide variety of shapes and sizes. The largest is the lion's mane jellyfish (Cyanea capillata), which can have a bell over six and a half feet in diameter and weigh up to 440 pounds; the smallest is the Irukandji jellyfish, several species of dangerous jellyfishes found in tropical waters, which measure only about two-tenths of an inch and weigh well under a tenth of an ounce.
Dec 3, 2020 · A Mediterranean jellyfish. Jellyfish Reproduction. Not a lot is known about the ways that the various jellyfish species reproduce. The best-studied jellyfish belong to the genus Aurelia. These jellyfish have separate sexes and so the adults reproduce sexually. The males release their sperm through their mouths which then enter the surrounding ...
Oct 19, 2023 · 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. Grades. 5 - 12+ Subjects. Biology, Ecology. Credits. Media Credits.
