Ampyx (trilobite) GudangMovies21 Rebahinxxi LK21

    Ampyx is an Ordovician-Silurian genus of Asaphid trilobites of the family Raphiophoridae. Species of Ampyx are characterized by three extended spines on the head-shield, one spine derived from each free cheek, and one spine emanating from the glabellum. Species include Ampyx linleyensis (Lanvirn-Caradoc series).
    Species of Ampyx grew to an average length of 1.5 inches (3.8 cm).


    Collective behaviour



    Fossils of the trilobite Ampyx priscus, dating back about 480 million years ago, have been recently described as clustered in lines along the ocean floor. The animals were all mature adults, and were all facing the same direction as though they had formed a conga line or a peloton. It has been suggested they line up in this manner to migrate, much as spiny lobsters migrate in single-file queues. Or perhaps they are getting together for mating. The findings suggest animal collective behaviour has very early evolutionary origins.


    Distribution


    Fossils of Ampyx have been found in:

    Ordovician
    Acoite, Suri, Ponon-Trehue, Sepulturas and San Juan Formations, Argentina
    Sella Formation, Bolivia
    Australia
    Canada (British Columbia, Newfoundland and Labrador, Northwest Territories, Quebec, Yukon)
    China
    France
    Iran
    Ireland
    Morocco
    Norway
    Russia
    Sweden
    United Kingdom
    United States (California, Maine, Nevada, Tennessee, Virginia)
    Silurian
    Italy
    United Kingdom


    See also


    List of trilobites


    References

Kata Kunci Pencarian: ampyx trilobite

ampyx trilobite