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. ==Function== It sometimes bears antennae and eyes. It often functions like a kind of ove....
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http://en.wikipedia.org/wiki/Prostomium
• (n.) That portion of the head of an annelid situated in front of the mouth.
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http://thinkexist.com/dictionary/meaning/prostomium/
(from the article `annelid`) The body form of polychaetes (see figure) varies, depending on whether the polychaete is free-moving, sedentary, or pelagic (ocean-dwelling). The ...
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http://www.britannica.com/eb/a-z/p/122
The lobe of skin that projects out in front of the first body segment (peristomium). It is located above the mouth.
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Pro·sto'mi·um noun ;
plural Prostomia . [ New Latin , from Greek ... before + ..., ..., mouth.]
(Zoology) That portion of the head of an annelid situated in front of the mouth. --
Pro*sto'mi*al adjective Found on
http://www.encyclo.co.uk/webster/P/179
the unsegmented, preoral portion of the head of certain lower invertebrates.
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https://www.infoplease.com/dictionary/prostomium
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