Macrogrammus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites.
It lived during the early part of the Arenig stage of the Ordovician Period,[1] a faunal stage which lasted from approximately 478 to 471 million years ago.
Its fossil name is Macrogrammus scylfense Whittard named after its British Collector WF Whittard in 1966.
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