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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. 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.

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

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

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  5. Echinocardium cordatum - Wikipedia

    en.wikipedia.org/wiki/Echinocardium_cordatum

    The sea potato is a heart-shaped urchin clothed in a dense mat of furrowed yellowish spines which grow from tubercles and mostly point backwards. The upper surface is flattened and there is an indentation near the front. This urchin is a fawn colour but the tests that are found on the strandline have often lost

  6. 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 ...

  7. Tripneustes gratilla - Wikipedia

    en.wikipedia.org/wiki/Tripneustes_gratilla

    Tripneustes gratilla, the collector urchin, is a species of sea urchin. Collector urchins are found at depths of 2 to 30 metres (7 to 100 ft) in the waters of the Indo-Pacific, Hawaii, the Red Sea, and The Bahamas. They can reach 10 to 15 centimetres (4 to 6 in) in size.

  8. 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.

  9. Echinometra mathaei - Wikipedia

    en.wikipedia.org/wiki/Echinometra_mathaei

    Echinometra mathaei grows to a test diameter of about 5 centimetres (2.0 in). The colour is quite variable but the test is usually a dark colour. The spines are sometimes green and purple with purple tips or entirely green with purple tips but this sea urchin can be distinguished from other species by a characteristic pale ring at the base of each spine.