Lesson plan
Eusemius
Eusemius is an extinct genus of prehistoric marine ray-finned fish, previously described as a macrosemiid, that lived during the Late Jurassic. It contains a single species, E. beatae, from the Tithonian-aged Eichstätt Formation of Germany. It is known from a single very small specimen, likely a juvenile, that is likely now lost. It closely resembles the co-occurring Ophiopsis and Ophiopsiella (which are now classified in the Ionoscopiformes), only differing in the non-bifurcated dorsal fin rays.
Article summary
Eusemius is an extinct genus of prehistoric marine ray-finned fish, previously described as a macrosemiid, that lived during the Late Jurassic. It contains a single species, E. beatae, from the Tithonian-aged Eichstätt Formation of Germany. It is known from a single very small specimen, likely a juvenile, that is likely now lost. It closely resembles the co-occurring Ophiopsis and Ophiopsiella (which are now classified in the Ionoscopiformes), only differing in the non-bifurcated dorsal fin rays.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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