prostomium

prostomium读音音标

英 [prəʊ\'stəʊmɪəm]

美 [proʊ\'stoʊmiəm]

prostomium意思解释

n.

口前叶；

英英释义

The prostomium (sometimes also called the acron) is the first body segment in an annelid worm\'s body in the anterior end. It is in front of (but does not include) the mouth, being usually a small shelf- or lip-like extension over the dorsal side of the mouth.