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Orange-lined triggerfish : ウィキペディア英語版 | Orange-lined triggerfish
''Balistapus undulatus'', also known as the Orange-lined triggerfish is a demersal marine fish belonging to the family Balistidae, the triggerfishes. It is the only member of the monotypic genus ''Balistapus''. 〔Matsuura, K. (2014): Taxonomy and systematics of tetraodontiform fishes: a review focusing primarily on progress in the period from 1980 to 2014. ''Ichthyological Research, 62 (1): 72-113.'' 〕 ==Description== It grows up to 30 cm long. Its body has a stock appearance, oval shape and compressed laterally. The head is large and is about one third of the body length. The mouth is small and terminal and it has strong teeth.〔Lieske, E. & Myers, R. ''Coral Reef Fishes''. Princeton University Press. 2009. ISBN 9780691089959〕 The first dorsal fin has three spines, one of which is longer and stronger. It is erectile and kept in a dorsal furrow at rest. The second dorsal fin is similar in shape and size to the anal fin, which is symmetrically opposed to it. The pelvic fin is reduced to a ventral protrusion.〔 The body is dark green with orange lines. The male loses the lines on his snout as he matures. There is a black blotch on the caudal peduncle, and the caudal fin is orange.〔
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