Definition of "epistoma" [e•pis•to•ma]

• Alternative form of epistome. (noun)

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• "Peristoma - ium: the border of the mouth or oral margin in Diptera; sometimes used as: = epistoma: q.v. Peristome: a membranous tissue surrounding the mouth parts at base, and forming the true ventral wall of the head."
• "Clypeus: that portion of the head before or below the front, to which the labrum is attached anteriorly; in Diptera often visible below the margin of the mouth in front, as a more or less visor-shaped piece: = epistoma."
• "_Antennæ_ epistoma non attingentes; articulus tertius longiusculus, linearis, apice conicus; arista subpubescens."