Abstract
Summary Callionymus megastomus sp. nov. is described and compared with allied species. Features which distinguish it from allied species are as follows: 1. (1)The combination of three spines in the first dorsal fin, constantly ten rays in the second dorsal fin, and nine rays in the anal fin with a preopercular spine formula of ;2. (2)the extremely protractile maxillary complex, with a very long processus ascendens of the premaxillary;3. (3)the shape and colour pattern of the first dorsal fin.
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