from The Century Dictionary.

  • noun An inferior part or organ of the mouth of arthropods and some other animals.
  • noun [capitalized] Same as Hypostomus.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun hypostome


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  • Mystax: in Diptera; a patch of hair or bristles above the mouth, on the lower part of the hypostoma above the vibrissae.

    Explanation of Terms Used in Entomology John. B. Smith

  • Epistoma - is: the lower face between the mouth and eyes: that sclerite immediately behind or above the labrum, whether it be clypeus or an intermediate piece: in Diptera, that part of the face between the front and the labrum; the oral margin and an indefinite space immediately contiguous thereto and so = peristoma: in Odonata; = clypeus: = hypostoma.

    Explanation of Terms Used in Entomology John. B. Smith


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