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20 juin 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.
- The Editors of Encyclopaedia Britannica
Il y a 5 jours · At low pressures, membranes made from deep-sea jellies’ lipids broke apart, each segment curling into a tight tube. A closer look revealed why: Compared with their shallow-water cousins, deep jellies have five times more of a lipid type called PPE.
16 juin 2024 · Lacking brains, blood, or even hearts, jellyfish are pretty simple critters. They are composed of three layers: an outer layer, called the epidermis; a middle layer made of a thick, elastic, jelly-like substance called mesoglea; and an inner layer, called the gastrodermis.
26 juin 2024 · Like those of cnidarians, (jellyfish, sea anemones, etc.), ctenophores' bodies consist of a relatively thick, jelly-like mesoglea sandwiched between two epithelia, layers of cells bound by inter-cell connections and by a fibrous basement membrane that they secrete.
24 juin 2024 · The jellyfish is a very ancient marine animal. Fossils dating back 600 million years have been discovered in Australia. Some of the footprints left correspond to the ancestors of jellyfish known as Ediacaria. Jellyfish are all distinguished by their lack of heart, brain and lungs! They breathe through the walls of their body.
Il y a 2 jours · Takeaway. The evolution of jellyfish is a testament to the remarkable adaptability of life in Earth’s oceans. From their ancient origins to their present-day diversity, jellyfish have undergone a journey shaped by millions of years of environmental change.
Il y a 6 jours · Ctenophores, also called comb jellies, are ghostly-looking bags of goo whose crystalline comb-legs refract light into rainbows. Despite their ethereal looks, they’re voracious predators that...
