protostoma

Noun

 * 1)  In nematodes, a particular division of the stoma mouthlike opening.
 * 1)  In nematodes, a particular division of the stoma mouthlike opening.
 * 1)  In nematodes, a particular division of the stoma mouthlike opening.
 * 1)  In nematodes, a particular division of the stoma mouthlike opening.

Etymology
From.

Noun

 * 1)  protostome