Abstract
The juvenile development of four Japanese flatheads (Platycephalidae),Onigocia macrolepis. O. spinosa, Inegocia japonica andRogadius asper, is described and illustrated from specimens trawled in Tosa Bay, southern Japan. Juveniles of twoOnigocia species are diagnosed by an ocular flap and absence (O. macrolepis) or presence (O. spinosa) of distinct dark bars on the body.Inegocia japonica juveniles are distinctive in having a heavily pigmented body and 12 dorsal and anal fin soft rays.Rogadius asper has a unique antrorse preopercular spine prior to 15 mm SL. During the early juvenile stage, strongly negative allometric growth occurs in the interorbital region, accompanied by migration of the eyes from the lateral to dorsal surface of the head.
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Hirota, M., Sasaki, K. Development of juveniles of four flatheads (Perciformes, Platycephalidae) occurring in southern Japan. Ichthyological Research 45, 291–301 (1998). https://doi.org/10.1007/BF02673927
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DOI: https://doi.org/10.1007/BF02673927