Semadiscus Temporal range:
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Genus: | Semadiscus Romanenko, 1978
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Semadiscus is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It has been collected from the Lower Cambrian (early Botomian) of Canada (Newfoundland), Russia (Siberia, Gorno-Altaysk), and the United States (New York State). Only the headshield (or cephalon) is known, and it may well be that it would be better to include it in Serrodiscus.[according to whom?]