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| Crotalocephalina Temporal range: Devonian | |
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| Genus: | Crotalocephalina |
Crotalocephalina is an extinct genus of trilobite in the order Phacopida found in Morocco.
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Eusarcana is a genus of eurypterid, an extinct group of aquatic arthropods. Fossils of Eusarcana have been discovered in deposits ranging in age from the Early Silurian to the Early Devonian. Classified as part of the family Carcinosomatidae, the genus contains three species, E. acrocephalus, E. obesus and E. scorpionis, from the Silurian-Devonian of Scotland, the Czech Republic and the United States respectively.