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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

    A fossil sea urchin found on a Middle Saxon site in Lincolnshire, thought to have been used as an amulet [87] Some species of sea urchins, such as the slate pencil urchin (Eucidaris tribuloides), are commonly sold in aquarium stores. Some species are effective at controlling filamentous algae, and they make good additions to an invertebrate ...

  4. Tetragramma donaldtrumpi - Wikipedia

    en.wikipedia.org/wiki/Tetragramma_donaldtrumpi

    Tetragramma donaldtrumpi is a species of fossil sea urchins discovered and identified by William R. Thompson Jr. in 2016. [1] The specimen locality is from the Lower Cretaceous, Trinity Group, of the Glen Rose Formation near Fischer, Texas, in the United States.

  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. Echinopsis (sea urchin) - Wikipedia

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

    Echinopsis is an extinct genus of sea urchins in the class Echinoidea. These slow-moving low-level epifaunal grazers lived from the Cretaceous to the Paleogene periods (125.45 - 5.332 Ma). Fossils of this genus have been found in the sediments of Madagascar, Pakistan, Senegal, Sudan, United States and Switzerland. [1]

  7. Holectypus - Wikipedia

    en.wikipedia.org/wiki/Holectypus

    Holectypus is an extinct genus of sea urchin. ... Fossils have been found all around the world. [2] References This page was last edited on 29 ...

  8. Mystery solved: Scientists ID Caribbean sea urchin killer

    www.aol.com/news/mystery-solved-scientists-id...

    For marine scientists, it was deja vu: Another die-off swept through the region in the 1980s and slashed sea urchin populations by around 98%. Last year, sea urchins in the Caribbean started ...

  9. Tripneustes - Wikipedia

    en.wikipedia.org/wiki/Tripneustes

    These sea urchins have been recorded as fossils from Miocene to Recent (from 15.97 to 0.0 Ma). Fossils have been found in the sediments of Southern Europe, Mediterranean and North Africa, Caribbean, Western coast of America and throughout the Indo-Pacific. [2]

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