epistome


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epistome

[′ep·ə‚stōm]
(invertebrate zoology)
The area between the mouth and the second antennae in crustaceans.
The plate covering this region.
The area between the labrum and the epicranium in many insects.
A flap covering the mouth of certain bryozoans.
The area just above the labrum in certain dipterans.
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References in periodicals archive ?
maomaotou has a triangular and small epistome, while the epistome is absent in B.
Diagnosis.--Moderately sized troglomorphic species; carapace without eyes or eyespots, anterior margin toothed, posterior margin with 2 setae, epistome very pointed and small; anterior tergites (I-II) with 4 setae; intercalary teeth only present on chelal fixed finger, movable finger with 6-7 teeth; lacking chemosensory setae on dorsum of chelal hand.
Cephalothorax: Carapace 1.11-1.14 times longer than broad; anterior margin toothed; lateral margins constricted posteriorly; without any traces of eyes; epistome very pointed and small; with 16 setae arranged 4: 4: 4: 2: 2; without furrows.
38): ubquadrate, distinctly longer than broad, weakly constricted posteriorly; medial part of anterior margin weakly prominent, without a well-defined epistome and strongly dentate (Fig.
Cephalothorax: carapace: small epistome present; one pair of small eyes present; with 4 setae on anterior margin and 4 setae on posterior margin.
Cephalothorax: carapace 0.98 times longer than broad; small epistome present; one pair of small eyes present; with 4 setae on anterior margin and 4 setae on posterior margin.
Cephalothorax: carapace 1.03 times longer than broad; very small epistome present; one pair of small eyes present; with 4 setae on anterior margin and 2 setae on posterior margin.