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The rarely encountered deep-sea jellyfish Stygiomedusa gigantea is another candidate for "largest jellyfish", with its thick, massive bell up to 100 cm (3 ft 3 in) wide, and four thick, "strap-like" oral arms extending up to 6 m (19 + 1 ⁄ 2 ft) in length, very different from the typical fine, threadlike tentacles that rim the umbrella of more ...
Ordovician (485–443 Ma): Fish, the world's first true vertebrates, continued to evolve, and those with jaws (Gnathostomata) may have first appeared late in this period. Life had yet to diversify on land. Arandaspis: Arandaspis are jawless fish that lived in the early Ordovician period, about 480–470 Ma.
Many modern mammal groups begin to appear: first glyptodonts, ground sloths, canids, peccaries, and the first eagles and hawks. Diversity in toothed and baleen whales. 33 Ma Evolution of the thylacinid marsupials . 30 Ma First balanids and eucalypts, extinction of embrithopod and brontothere mammals, earliest pigs and cats. 28 Ma
Incredibly well-preserved fossils of the oldest swimming jellyfish, which lived 505 million years ago, were discovered at a famed fossil site in Canada. ... The Burgess Shale was first discovered ...
The first tetrapodomorphs, which included the gigantic rhizodonts, had the same general anatomy as the lungfish, who were their closest kin, but they appear not to have left their water habitat until the Late Devonian epoch (385–359 Mya), with the appearance of tetrapods (four-legged vertebrates).
The developmental stages of scyphozoan jellyfish's life cycle: 1–3 Larva searches for site 4–8 Polyp grows 9–11 Polyp strobilates 12–14 Medusa grows. Most species appear to be gonochorists, with separate male and female individuals.
The fish's species was, at first, hard to identify because it appeared to have no eyes, mouth, tentacles, front or back. NPR reports scientists first believed it might be a whale placenta.
The post 101 Fish Puns That Will Split Your Gills appeared first on Reader's Digest. ... When jellyfish act catty, it’s only because they’re jelly. 14. Speaking of being jelly, tunas were ...