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Words related to silurian

Si·lu·ri·an
S s

  • anaspid

    any member of an extinct order, Anaspida, of small, freshwater jawless fishes of the Silurian and Devonian periods, characterized by a single nostril, narrow rows of scales, and, usually, an armor-plated head.

  • chain coral

    coral of the extinct genus Halysites, from the Ordovician and Silurian periods, consisting of oval, laterally compressed corallites united to form a chainlike structure.

  • favosite

    any of numerous corals of the extinct genus Favosites, most common during the Silurian and Devonian periods, having polygonal cells with rows of pores in the walls.

  • graptolite

    any colonial animal of the extinct class Graptolithina, most common in the Ordovician and Silurian Periods, thought to be related to the pterobranchs.

  • heterostracan

    any of several ostracoderms of the order Heterostraci, from the Silurian and Devonian Periods, having the anterior part of the body enclosed in bony plates.

  • nautiloid

    a mollusk of the subclass Nautiloidea, including nautiluses and many fossil species that were abundant in the Ordovician and Silurian periods.
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