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Osteological development of the lumpfish,inimicus japonicus (pisces: Synanceiidae)
Authors:Hisashi Imamura  Mamoru Yabe
Institution:(1) Hachinohe Branch, Tohoku National Fisheries Research Institute, Fisheries Agency, 25-259 Same, Hachinohe, 031 Aomori, Japan;(2) Laboratory of Physiology, Faculty of Fisheries, Hokkaido University, 3-1-1 Minato-cho, Hakodate, 041 Hokkaido, Japan
Abstract:The osteological development of the synanceiidInimicus japonicus, was described on the basis of five larvae and four juveniles (4.2–10.1 mm BL) reared in the laboratory, and two wild adult specimens. All bones, except for the basisphenoid, were formed in all larvae and juveniles, but fusions between the uppermost actinost and scapula, upper caudal plate and urostyle, and third preural centrum and hemal spine were not completed by 10.1 mm BL. Following comparison with the adult condition, a rod-like ossified bone without a tooth plate on the upper branchial arch of larvae and juveniles was considered homologous with the second pharyngobranchial. The number of epurals and length of the neural spine on the second preural centrum varied (unrelated to growth) and it is inferred thatJ. japonicus shows intraspecific variations in these bones.
Keywords:Inimicus japonicus            osteological development  larvae  juveniles  homology
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