Tasmanocephalus 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.

Fossils of the genus have been reported from the Karmberg and Caroline Creek Formations of Tasmania, Australia.

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