Deliberations on the External Morphology and Modification of the Labial Segments in the Nepomorpha (Heteroptera: Insecta) with Notes on the Phylogenetic Characteristics
Shapes of the labial segments of the Nepidae (Nepinae). (a)–(e) Laccotrephes japonensis. (a) Dorsal view (D) of the labium, the II, III and IV segments are visible, the articulation of the dorsal condyle (cd) between the II and III segments on the dorsal side, intercalary sclerites (is) on the III, segment. (b) The shape of the first segment slightly visible in the dorsal position, the base of the second (II) segment is almost as wide as the end of the first (I) segment, the stylet groove (gr) is opened, (c) ventral view of the IV segment, the oval apical plate is visible, (d) ventral view (V), the connection between the third and fourth segments on the ventral side, the midventral condyle (cv) on the third segment is slightly visible, (e) the ventral view of the first and second segments (cuplike), the intersegmental membranes can be observed, (f) the midventral condyle (cv) on the distal edge of the first segment (I). Lr: labrum, Mxp: maxillary plates.
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