龙介虫科（学名：Serpulidae）是多毛纲下的一科管状环节动物。它们与缨鳃虫科不同的是它们拥有像厣的特别辐棘，可以用来保护管口。它们是分泌碳酸钙的管腔。现时已知约有300个物种，除了一种外，其余都是生活在海水环境。本科物种最早出现于中三叠世。

龙介类和Sabellid的大多数物种的血液含有一种能与氧气结合的色素血绿素（chlorocruorin）。这种血绿素负责为身体组织携带氧气。 这种血绿素与一氧化碳结合的亲和力，是人血内的血红素的570倍。

龙介虫科的管腔很易与蛇螺科的壳混淆。龙介虫科的管腔内侧沉色及只有两层，而蛇螺科的壳则内侧光泽及有3层。

Serpulidae is a family of sessile, tube-building annelid worms in the class Polychaeta. The members of this family differ from the sabellid tube worms in that they have a specialized operculum that blocks the entrance of their tubes when they withdraw into the tubes. In addition, serpulids secrete tubes of calcium carbonate. Serpulids are the most important biomineralizers among annelids. There are about 300 known species in the Serpulidae family, all but one of which live in saline waters. The earliest serpulids are known from the Middle Triassic.