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Ctenacanthus is a Paleozoic ctenacanthiform shark genus named by Louis Agassiz in 1837, noted for comb-like dorsal fin spines.
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Tristychius arcuatus is an extinct small shark from Carboniferous rocks in Scotland. It is a member of Tristychius, a fossil shark genus used in research on early elasmobranch diversity, and its anatomy provides evidence about suction feeding in early cartilaginous fishes. The species is primarily r...
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