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FIGURE 19 in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURE 19. Phylogenetic tree obtained with IQ-TREE. Numbers in nodes, ultrafast bootstrap / SH-like aLRT support.

FIGURES 14–15. 14 in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURES 14–15. 14. Geographical distribution of Adelphydraena species. 15. Type locality of Adelphydraena spinosa, in Guyana. Photo. by A. Short.

FIGURES 16–18 in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURES 16–18. Habitats of Adelphydraena species. 16–17. Collecting locality of Adelphydraena orchymonti, in Venezuela, Amazonas prov., Cerro Cuau env. 18. Collecting locality of Adelphydraena spangleri, in Venezuela, Bolívar prov., La Gran Sabana, Yaro Parú. Photos. by F. Čiampor.

FIGURES 11–12. 11. Adelphydraena spinosa n in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURES 11–12. 11. Adelphydraena spinosa n. sp., spermatheca and terminal abdominal segments. 12. Adelphydraena surinamensis n. sp., spermatheca and terminal abdominal segments.

FIGURES 5–6. 5 in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURES 5–6. 5. Adelphydraena spangleri Perkins, non-type aedeagus and last tergites. 6. Adelphydraena surinamensis n. sp., holotype aedeagus and last tergite.

FIGURES 9–10. 9. Adelphydraenaspinosa n in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURES 9–10. 9. Adelphydraenaspinosa n. sp., holotypeaedeagus. 10. Adelphydraenaorchymonti Perkins, non-type, aedeagus.

FIGURE 13 in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURE 13. Ventral habitus of Adelphydraena species.

FIGURE 7. Adelphydraena spinosa n in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURE 7. Adelphydraena spinosa n. sp., habitus of holotype.

FIGURE 1 in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURE 1. Dorsal habitus of Adelphydraena species.

FIGURE 4 in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURE 4. Adelphydraena spangleri Perkins, habitus of non-type.

FIGURE 3 in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURE 3. Adelphydraena orchymonti Perkins, habitus of non-type.

FIGURE 8. Adelphydraena surinamensis n in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURE 8. Adelphydraena surinamensis n. sp., habitus of holotype.

FIGURE 2. Adelphydraena amazonica n in Three new species and DNA sequence data of the rare South American water beetle genus Adelphydraena Perkins, 1989 (Coleoptera: Hydraenidae)

FIGURE 2. Adelphydraena amazonica n. sp., habitus of holotype.