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 Gelastocoridae. (a)–(g) Nerthra nepaeformis. (a) Dorsal view (D) of the labium, the shapes of the I and II segments, a deep notch on the lateral slide, the stylet groove is closed, (b) the shape of the first segment (I), lateral and ventral view, intersegmental membrane (mb) is visible, (c) the shape of the second segment (II)—dorsal view, and the third (III) segment—ventral view, (d) the third segment, dorsal view with the intercalary sclerites, (e) dorsal view of the fourth (IV) segment, (f) no midventral condyle (cv) on the distal edge of the third segment (circle), and (g) ventral view of the fourth segment, the apical plate is visible. Lr: labrum.
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