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n.1.(Paleon.) A genus of fossil fishes, found in Devonian and carboniferous strata; - so named from their round, sculptured spines.
References in periodicals archive ?
Don and Eldon collected skull roofs of haplolepidid fishes and a fin-spine of a small acanthodian fish (Gyracanthus) that Don later described in detail (Baird 1962a, 1978a).