epistome


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epistome

the area immediately surrounding the mouth in some animals, particularly
  1. the area between the antennae and mouth in Crustacea
  2. the part of the head in insects, immediately behind the labrum
  3. the overhanging lobe above the mouth in Polyzoa.
References in periodicals archive ?
Carapace: Smooth, 1.16 times longer than broad, with a total of 34 setae, including 6 on anterior margin and 8 on posterior margin; without eyesoreyespots; epistome very small, triangular.
chinaca-vernicola has a single small eyespot without lens on each side), epistome triangular (rounded in B.
13) strongly prominent and dentate, with a rudimentary epistome. Anophthalmic.
31): subquadrate, distinctly longer than broad, weakly constricted posteriorly; medial part of anterior margin prominent, without a well-defined epistome and strongly dentate (Fig.
For example, the ocular area becomes broadened with increasing width of the carapace; the subocular plate and the epistome are gradually projected forward and the eyestalks degenerate.
Anterior and posterior margins of carapace procurved; anterior margin with shallow median notch (emargination), without median projection (epistome) (Fig.
9) 0.94-1.11 [male], 0.97-1.00 [female] times longer than broad; lateral margins evenly convex; with 2 small bulging eyes; with small epistome; with ca.