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Commerson's frogfish or the giant frogfish, ''Antennarius commerson'', is a marine fish belonging to the family Antennariidae. ==Description== Commerson's frogfish grows up to . Like other members of its family, it has a globular, extensible body. The soft skin is covered with small dermal spinules. Its skin is partially covered with a few small, wartlike protuberances, some variably shaped, scab-like blotches, and a few, small eye spots (ocelli) reminiscent of the holes in sponges. Its large mouth is prognathous, allowing it to consume prey as large as itself. Their coloration is extremely variable, as they tend to match their environments. Frogfish can change their coloration in a few weeks. However, the dominant coloration goes from grey to black, passing through a whole range of related hues, such as cream, pink, yellow, red, and brown, and also usually with circular eye spots or blotches that are darker than the background. Juvenile specimens can easily be confused with related ''Antennarius maculatus'' and ''Antennarius pictus''. To distinguish these species, ''A. maculatus'' usually has red or orange margins on all fins, while ''A. maculatus'' has numerous warts on the skin, and ''A. pictus'' is covered with ocelli. ''A. pictus'' has three eye spots on its caudal fin.〔(EOL: Frogfishes )〕 The first dorsal spine, the illicium, is modified for use as a fishing rod. Its extremity is endowed with a characteristic esca (lure), which resembles a small fish or shrimp with a pinkish to brownish coloration. The illicium is twice the length of the second dorsal spine and is often darkly banded. The second dorsal spine is practically straight and is mobile, the third one is bent towards the back of the body, and both are membranously attached to the head. They are well separated from each other and also from the dorsal fin.〔Pietsch & Grobecker, ''Frogfishes of the world'', Stanford University Press, 1987, ISBN 9780804712637〕 The pectoral fins are angled, and the pelvic fins help the frogfish move on the bottom and keep a stable position for ambush. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Commerson's frogfish」の詳細全文を読む スポンサード リンク
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