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

Figure 2

Various shapes of the apical plate in the Nepomorpha: Nepinae: (a) Laccotrephes japonensis, Ranatrinae: (b) Cercotmetus asiaticus, (c) Ranatra chinensis, Belostomatidae: Belostomatinae: (d) Belostoma flumineum, (e) Hydrocyrius colombiae, Lethocerinae: (f) Lethocerus deyrollei, Ochteridae: (g) Ochterus marginatus, Gelastocoridae: Gelastocorinae: (h) Gelastocoris oculatus, Nerthrinae: (i) Nerthra nepaeformis, Aphelocheiridae: (j) Aphelocheirus aestivalis, Naucoridae: Cheirochelinae: (k) Cheirochela feana, Cryphocricinae: (l) Cryphocricos hungerfordi. Laccocorinae: (m) Laccocoris hoogstraali, Limnocorinae: (n) Limnocoris lutzi, Naucorinae: (o) Pelocoris femoratus, (p) Naucoris maculatus, Pleidae: (q) Paraplea frontalis, Helotrephidae: (r) Hydrotrephes visayasensis, Notonectidae: Notonectinae: (s) Notonecta glauca, (t) Nychia sappho.