Jellyfish - Wikipedia
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, although a few are anchored to the seabed by …
Jellyfish | Characteristics, Habitat, Diet, Anatomy, & Facts | Britannica
2024年10月25日 · 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.
What are jellyfish made of? - NOAA's National Ocean Service
2024年6月16日 · The simple digestive cavity of a jellyfish acts as both its stomach and intestine, with one opening for both the mouth and the anus. These simple invertebrates are members of the phylum Cnidaria, which includes creatures such as sea anemones, sea whips, and corals.
Jellyfish - Facts and Beyond - Biology Dictionary
2020年12月3日 · 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.
Jellyfish: The smart stinging creatures drifting through our oceans
Jellyfish are invertebrates – animals that don’t have a backbone – and belong to a group called Cnidaria. Some of their closest relatives include colourful corals and anemones. “Jellyfish are gelatinous and jelly-like,” explains Miranda Lowe CBE, …
Jellyfish Facts, Types, Classification, Habitat, Diet, Adaptations
Jellyfish are gelatinous aquatic animals belonging to the subphylum Medusozoa. These free-swimming invertebrates evolved around 500 million years ago and have been roaming the oceans around the world, in both warm water and cold water. They are easily identified by their trailing tentacles and umbrella-shaped bells.
Jellyfish facts and photos - National Geographic Kids
But despite their name, jellyfish aren't actually fish—they're invertebrates, or animals with no backbones. Jellyfish have tiny stinging cells in their tentacles to stun or paralyze their...
Jellyfish Facts: Habitat, Behavior, Diet - ThoughtCo
2019年12月13日 · Jellyfish lack a central nervous system, a circulatory system, and a respiratory system. Compared to vertebrate animals, they are extremely simple organisms, characterized mainly by their undulating bells (which contain their stomachs) and their dangling, cnidocyte-spangled tentacles.
Jellyfish and Comb Jellies - Smithsonian Ocean
Jellyfish and comb jellies are gelatinous animals that drift through the ocean's water column around the world. They are both beautiful—the jellyfish with their pulsating bells and long, trailing tentacles, and the comb jellies with their paddling combs generating rainbow-like colors.
Jellyfish & Other Zooplankton - Woods Hole Oceanographic …
2020年7月14日 · What are Jellyfish? Jellyfish are a type of zooplankton that both drift in the ocean and have some swimming ability. Hundreds of jellyfish species live in every part of the ocean and belong to the same animal group as corals and sea anemones.