Deliberations on the External Morphology and Modification of the Labial Segments in the Nepomorpha (Heteroptera: Insecta) with Notes on the Phylogenetic Characteristics

<table>Shapes of the labial segments of the Gelastocoridae. (a)–(e) <i>Gelastocoris oculatus</i>. (a) The shape of the first and second segment, dorsal view, the stylet groove is closed, one intersegmental sclerit (si) and intersegmental membrane (mb) are visible, (b) ventral view of the I, II and III segments, the midventral condyle (cv) on the distal edge of III and IV segments is invisible (circle), triangular shape of the apical plate, (c) the shape of the second segment (II), the dorsal condyle (cd) between the II and III segments on the dorsal side, small intercalary sclerites (is), (d) the shape of the IV segment, ventral view (V), the stylet groove is closed, and (e) pairs of the small intercalary sclerites, magnified. Lr: labrum.</table>

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Figure 16

Figure 16: Deliberations on the External Morphology and Modification of the Labial Segments in the Nepomorpha (Heteroptera: Insecta) with Notes on the Phylogenetic Characteristics 

Figure 16 | Deliberations on the External Morphology and Modification of the Labial Segments in the Nepomorpha (Heteroptera: Insecta) with Notes on the Phylogenetic Characteristics 