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Longneck eels or neck eels are a family, Derichthyidae, of eels. They are pelagic fishes, found in the middle and depths of most oceans. The name comes from Greek ''deres'' meaning "neck" and ''ichthys'' meaning "fish". They are distinguished by the presence of a series stripes on the head that form part of the sensory system, but otherwise the two genera of the family are quite different in appearance. ''Derichthys'' has a narrow neck and large eyes, while ''Nessorhamphus has a long, flattened, snout. They grow to about in length. ==Species== The three species in two genera are: * Genus ''Derichthys'' (one species) * Genus ''Nessorhamphus'' (two species) In some classifications (for example, ''Systema Naturae'' 2000), this family is split in two, with Derichthyidae containing only the genus ''Derichthys'', and ''Nessorhamphus'' being assigned its own family, Nessorhamphidae. 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「Longneck eel」の詳細全文を読む スポンサード リンク
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