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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

prostomium

that part of the head of some annelids and molluscs which lies in front of the mouth.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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.