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The Saccocirridae are small interstitial polychaetes common in coarse sand on reflective, surf beaches, usually within the zone of retention. The Saccociridae are members of the clade Protodrilida, which is in turn part of the clade Canalipalpata. Saccocirridae have a worldwide distribution and many more species likely remain to be described. These polychates are usually between 2 and 10 mm in length and 500 μm wide. They have reduced parapodia and are considered a true interstitial species, incapable of burrowing through finer sediments.
Based on Saccocirrus sonomacus from the Pacific Coast of the Americas, the prostomium supports a pair of grooved palps that have a primarily sensory purpose. A pair of eyes are also present. The peristomium is probably reduced to a circumoral ring. The pygidium is usually bilobed.
The Saccocirridae are small interstitial polychaetes common in coarse sand on reflective, surf beaches, usually within the zone of retention. The Saccociridae are members of the clade Protodrilida, which is in turn part of the clade Canalipalpata. Saccocirridae have a worldwide distribution and many more species likely remain to be described. These polychates are usually between 2 and 10 mm in length and 500 μm wide. They have reduced parapodia and are considered a true interstitial species, incapable of burrowing through finer sediments.
囊鬚蟲科（學名：Saccocirridae） 是一種小間質的多毛綱生物。 身體通常是在2至10毫米的長度和500微米的寬之間。 他們的疣足已經退化。
本分類元是多毛綱之下一個亞綱地位未定的分類[1] [2]。本科之下只有一個屬，即囊鬚蟲屬（Saccocirrus）。
根據來自美洲太平洋海岸的Saccocirrus sonomacus，其口前葉有一對有槽的觸肢，主要作感官用途。牠亦有一雙眼睛。 其peristomium大概已縮小到只成為一個環口的環。 該尾板通常bilobed。
