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  2. Fossil echinoids - Wikipedia

    en.wikipedia.org/wiki/Fossil_echinoids

    Fossil of Acrocidaris, an extinct sea urchin Echinoid fossils are the fossilised remains of sea urchins , spiny marine invertebrates that live on the seabed. Humans have been interested in these fossils for millennia, have considered them lucky, have imbued them with magical powers and linked them to their deities .

  3. Diadema paucispinum - Wikipedia

    en.wikipedia.org/wiki/Diadema_paucispinum

    Diadema paucispinum is a small sea urchin with very long, moveable spines which are slender and sharply pointed. They can be up to 25 cm (10 in) long and about four times the diameter of the test. The primary spines are bluish-black in colour, often with pale bands in younger individuals.

  4. Sea urchin - Wikipedia

    en.wikipedia.org/wiki/Sea_urchin

    An inverted sea urchin can right itself by progressively attaching and detaching its tube feet and manipulating its spines to roll its body upright. [2] Some species bury themselves in soft sediment using their spines, and Paracentrotus lividus uses its jaws to burrow into soft rocks.

  5. Euechinoidea - Wikipedia

    en.wikipedia.org/wiki/Euechinoidea

    The subclass Euechinoidea includes almost all living species of sea urchin, with fossil forms going back as far as the Triassic. [1] [2] Taxonomy

  6. File:Fossil sea urchin (FindID 551527) cropped transparent ...

    en.wikipedia.org/wiki/File:Fossil_sea_urchin...

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  7. Echinothurioida - Wikipedia

    en.wikipedia.org/wiki/Echinothurioida

    The Echinothurioida are an order of sea urchins in the class Echinoidea. Echinothurioids are distinguished from other sea urchins by the combination of a flexible test and hollow spines. The membrane around the mouth contains only simple plates, in contrast to the more complex mouth parts of their close relatives, the Diadematoida. They are ...

  8. Diadema (sea urchin) - Wikipedia

    en.wikipedia.org/wiki/Diadema_(sea_urchin)

    The fossil record of Diadema is extremely poor, consisting only of spines that possibly belong to the genus, some of which go back to the Miocene, 5 to 25 million years ago. Species list [ edit ]

  9. Diadematidae - Wikipedia

    en.wikipedia.org/wiki/Diadematidae

    The Diadematidae are a family of sea urchins. Their tests are either rigid or flexible and their spines are long and hollow. [2] Astropyga Gray, 1825 Astropyga radiata (Leske, 1778), extant; Astropyga pulvinata (Lamarck, 1816), extant; Astropyga magnifica (Clark, 1934), extant; Centrostephanus Peters, 1855 Centrostephanus asteriscus (Agassiz ...