Lesson plan
Achoania
Achoania is an extinct genus of primitive marine bony fish which lived during the Early Devonian period. It is known from a skull discovered in the Xitun Formation of Yunnan, China. While originally considered to be a lobe-finned fish, later studies suggested that it may be a stem-group Osteichthyes instead. The morphology of the eye socket suggests that Achoania had an eyestalk connecting each eye to its head. This feature is rarely seen in most early bony fish, although it is also present in Psarolepis.
Article summary
Achoania is an extinct genus of primitive marine bony fish which lived during the Early Devonian period. It is known from a skull discovered in the Xitun Formation of Yunnan, China. While originally considered to be a lobe-finned fish, later studies suggested that it may be a stem-group Osteichthyes instead. The morphology of the eye socket suggests that Achoania had an eyestalk connecting each eye to its head. This feature is rarely seen in most early bony fish, although it is also present in Psarolepis.
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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?
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