prostomium

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prostomium

(prō-stō′mē-əm)
n. pl. prosto·mia (-mē-ə)
The anterior portion of the head of an annelid worm, situated in front of the mouth.

pro·sto′mi·al (-əl) adj.

prostomium

that part of the head of some annelids and molluscs which lies in front of the mouth.
References in periodicals archive ?
Individuals from the LD16:8 control and the LD8:16 control were narcotized as described above to provide prostomia. They were termed LD16:8 donors and LD8:16 donors, respectively.
Data also show that implantation of prostomia had no effect on oocyte diameter and did not induce oocyte degeneration.
To investigate whether the inhibition of spawning through exposure to LD8:16 photoperiods is endocrine mediated, we implanted LD8: 16 control females with prostomia from females maintained in LD16:8 or LD8:16 photoperiods for 2 weeks.