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Brook lamprey : ウィキペディア英語版
Brook lamprey

The brook lamprey (''Lampetra planeri'', also known as the European brook lamprey and the western brook lamprey) is a small European lamprey species that exclusively inhabits freshwater environments. The species is related to, but distinct from, the North American northern brook lamprey (''Lampetra richardsoni'').
== Description ==
This lamprey is the most common of the northern European species and is also the smallest. Adult brook lamprey measure from . The very elongate body is dark blue or greenish above, lightening to yellowish off-white on the sides and pure white below. Like all lampreys these fish lack paired fins and possess a circular sucking disc instead of jaws. They have a single nostril and seven small gill openings on either side behind the eye. The teeth are blunt and they can be told from the closely related river lamprey (''Lampetra fluviatilis'') by the fact that the two dorsal fins are more closely linked together.〔(【引用サイトリンク】title=Brook lamprey: ''Lampetra planeri'' )

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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