03:2403:24, 16 November 2022diffhist+19
Evolution of fish
→†Spiny sharks: a bazillion groups (including trilobites and sea scorpions) died in the end permian extinction, so this sentence seems to offer more of an opinion than a statement of fact (and also doesn't make sense cladistically given that chondrichthyans are still alive -- presumably non-chondricthyan acanthodians are meant?)