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Fig. 2
Loss of basihyal element in catfishes. Catfishes (Siluriformes) are characterized by the loss of the basihyal element in contrast to relatives, including zebrafish. (A) Zebrafish, Danio rerio (purchased from an aquarium fish store by P. Mabee). (B) Spotted Bullhead Catfish, Ameiurus serracanthus (ANSP 185358; provided by K. Luckenbill). Images show lower branchial elements in ventral view. bb, basibranchial; bh, basihyal; cb, ceratobranchial; ch, ceratohyal. Scale bars = 100 µm.
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