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Terebellida make up a order of the Polychaeta class, commonly referred to as "bristle worms". Together with the Sabellida, the Spionida and some enigmatic families of unclear taxonomic relationship (e.g. the Saccocirridae), they make up the subclass Canalipalpata, one of the three main clades of polychaetes.〔 Like most polychaetes, almost all members of the ''Terebellida'' are marine organisms. Most are small, sessile detritivores (deposit feeders) which live in small tubes they build from mud or similar substrate, or burrow in the sand. Their central nervous system displays characteristic apomorphies. ==Systematics== There is little consensus on the number of families. Some treatments accept as little as five,〔〔 while other authors list over a dozen. Here, the more inclusive view of the Terebellida is followed, based on a major review of polychaete systematics.〔 Cladistic studies have hitherto only analyzed a rather small proportion of polychaetes; hence it may be that some of the families today included in Terebellida by most authors will eventually be again recognized to belong elsewhere. * Acrocirridae (acrocirrids, sometimes placed in Spionida suborder) * Alvinellidae (alvinellids) * Ampharetidae (ampharetids) * * Ampharetinae (ampharetines, a subfamily) * Cirratulidae (cirratulids, sometimes placed in Spionida suborder) * Ctenodrilidae (ctenodrilids, sometimes own suborder Ctenodrilida) * Fauveliopsidae (fauveliopsids, sometimes own suborder Fauveliopsida) * Flabelligeridae (flabelligerids, sometimes Flabelligerida suborder) * Flotidae (flotids, sometimes included in Flabelligeridae) * Pectinariidae (pectinariids, commonly referred to as trumpet worms or ice cream cone worms) * Poeobiidae (poeobiids, sometimes own suborder Poeobiida or included in Flabelligerida suborder) * Sternaspidae (sternaspids, sometimes own suborder Sternaspida) * Terebellidae (terebellids, commonly referred to as spaghetti worms) * Trichobranchidae (trichobranchids) Image:Alvinella pompejana01.jpg|''Alvinella pompejana'', an Alvinellidae Image:Cirratulus cirratus.jpg|''Cirratulus cirratus'', a Cirratulidae Image:Diplocirrus incognitus habitus.jpg|''Diplocirrus incognitus'', a Flabelligeridae Image:Lagis koreni (with and without tube).jpg|''Lagis koreni'', a Pectinariidae (with its tube) Image:Lanice conchilega.jpg|''Lanice conchilega'', a Terebellidae 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「Terebellida」の詳細全文を読む スポンサード リンク
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