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FIGURE 3. A in Generic reclassification of species formerly included in Rhantus Dejean (Coleoptera, Dytiscidae, Colymbetinae)

FIGURE 3. A) Carabdytes upin upin (Balke, Hendrich & Wewalka, 1992), 12 mm, Papua New Guinea; B) Meridiorhantus antarcticus (Germain, 1854), 14 mm, Chile; C) Meridiorhantus calidus (Fabricius, 1792), 13 mm, Chile; D) Meridiorhantus validus (Sharp, 1882), 13 mm, Chile.

FIGURE 1 in Generic reclassification of species formerly included in Rhantus Dejean (Coleoptera, Dytiscidae, Colymbetinae)

FIGURE 1. Phylogenetic reconstruction of Colymbetinae relationships using different methods of phylogenetic inference (Bayesian, Maximum Likelihood, Parsimony, figure modified from Morinière et al. 2016 which contains more details on analytical procedures); node support for major backbone nodes indicated with asterisks: black meaning strong support, lighter shades of grey referring to increasingly weaker support. Distribution is coded in colour and ancestral areas were inferred using the software package BioGeoBEARS (details in Morinière et al. 2016). Notes: "R. signatus JFern." refers to a specimen from Juan Fernandez Archipelago (originally described as R. kuscheli Guignot, 1952).

FIGURE 2. A in Generic reclassification of species formerly included in Rhantus Dejean (Coleoptera, Dytiscidae, Colymbetinae)

FIGURE 2. A) Caperhantus cicurius (Fabricius, 1787), 16 mm, Republic of South Africa; B) Carabdytes guadalcanalensis (Balke, 1998), 10.5 mm, Solomon Islands; C) Carabdytes novaecaledoniae (J. Balfour-Browne, 1944), 13 mm, New Caledonia; D) Carabdytes plantaris (Sharp, 1882), 10 mm, New Zealand.

FIGURE 4. A in Generic reclassification of species formerly included in Rhantus Dejean (Coleoptera, Dytiscidae, Colymbetinae)

FIGURE 4. A) Nartus grapii (Gyllenhal, 1808), 11 mm, Germany; B) Rhantus atricolor (Aubé, 1838), 15 mm, Mexico; C) Rhantus frontalis (Marsham, 1802), 10.5 mm, Germany; D) Rhantus selkirki Jäch, Balke & Michat, 2014, 6.6 mm, Chile.

Figs. 9–12 in Larval Morphology and Phylogenetic Relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)

Figs. 9–12. Bunites distigma (first-instar larva). 9–10) Labium, dorsal and ventral aspects, respectively; 11) Anterior margin of prementum, dorsal aspect; 12) Apex of second labial palpomere, ventral aspect. LA ¼ labium. Numbers and lowercase letters refer to primary setae and pores, respectively. Solid squares refer to additional setae. Scale bar ¼ 0.20 mm for Figs. 9–10.

Fig. 19 in Larval Morphology and Phylogenetic Relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)

Fig. 19. Strict consensus cladogram obtained from four most parsimonious topologies of 10 terminal taxa of first-instar larvae of Colymbetini, with character changes mapped for each clade. Jackknife values indicated inside the boxes. * ¼ homoplastic character state transformation, ― ¼ reversal to the plesiomorphic condition.

Figs. 16–18 in Larval Morphology and Phylogenetic Relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)

Figs. 16–18. Bunites distigma (first-instar larva). 16–17) Eighth abdominal segment, dorsal and ventral aspects, respectively; 18) Urogomphus, dorsal aspect. AB ¼ eighth abdominal segment, UR ¼ urogomphus. Numbers and lowercase letters refer to primary setae and pores, respectively. Additional setae and pores not labeled. Scale bars ¼ 0.20 mm.

Figs. 1–3 in Larval Morphology and Phylogenetic Relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)

Figs. 1–3. Bunites distigma (first-instar larva). 1) Habitus, dorsal aspect; 2–3) Cephalic capsule, dorsal and ventral aspects, respectively. FR ¼ frontoclypeus, PA ¼ parietal. Numbers and lowercase letters refer to primary setae and pores, respectively. Additional setae not labeled. Scale bar ¼ 1.00 mm for Fig. 1 and 0.30 mm for Figs. 2–3.

Figs. 13–15 in Larval Morphology and Phylogenetic Relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)

Figs. 13–15. Bunites distigma (first-instar larva). 13–14) Metathoracic leg, anterior and posterior aspects, respectively; 15) Distal portion of metatarsus, anterior aspect. CO ¼ coxa, FE ¼ femur, PT ¼ pretarsus, TA ¼ tarsus, TI ¼ tibia, TR ¼ trochanter. Numbers and lowercase letters refer to primary setae and pores, respectively. Solid squares refer to additional setae. Scale bar ¼ 0.20 mm for Figs. 13–14.

Figs. 4–8 in Larval Morphology and Phylogenetic Relationships of Bunites distigma (Brullé) (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini)

Figs. 4–8. Bunites distigma (first-instar larva). 4–5) Antenna, dorsal and ventral aspects, respectively; 6) Mandible, dorsal aspect; 7–8) Maxilla, dorsal and ventral aspects, respectively. AN ¼ antenna, MN ¼ mandible, MX ¼ maxilla. Numbers and lowercase letters refer to primary setae and pores, respectively. Solid squares and solid triangles refer to additional setae and pores, respectively. Scale bars ¼ 0.20 mm.

Fig. 35 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 35. Single parsimonious tree obtained in the analysis of a structural dataset of Brychius spp. (Coleoptera: Haliplidae) using an exhaustive search with PAUP.

Fig. 33 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 33. Multiple discriminate analysis of Nearctic species of Brychius Thomson (Coleoptera: Haliplidae) based on measurements of adults from selected populations; a) males, b) females. 1 5 B. hungerfordi; 2 5 B. pacificus; 3 5 B. hornii (Creston, BC); 4 5 B. hornii (Cowan, MB); 5 5 B. hornii (Fort McMurray, AB); 6 5 B. hornii (Cypress Hills, AB).

Fig. 34 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 34. Average pronotal width measurements with the maximum and minimum values for selected samples of male specimens of Brychius spp. (Coleoptera: Haliplidae).

Fig. 32 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 32. Distribution of Brychius hornii Crotch (Coleoptera: Haliplidae) and Brychius pacificus Carr (Coleoptera: Haliplidae) in California, U.S.A. based on specimens examined.

Fig. 30 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 30. Distribution of Brychius pacificus Carr (Coleoptera: Haliplidae) based on specimens examined.

Fig. 29 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 29. Distribution of Brychius hungerfordi Spangler (Coleoptera: Haliplidae) based on specimens examined.

Fig. 28 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 28. Distribution of Brychius hornii Crotch (Coleoptera: Haliplidae) based on specimens examined.

Fig. 27 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 27. Leg chaetotaxy of right metathoracic leg of the larva of Brychius hungerfordi Spangler (Coleoptera: Haliplidae), third instar: a) anterior; b) posterior.

Fig. 25 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 25. Leg chaetotaxy of right prothoracic leg of the larva of Brychius hungerfordi Spangler (Coleoptera: Haliplidae), third instar: a) anterior, b) posterior.

Fig. 26 in Figs. 16–17. 16 in A Description of the First Instar of Hoperius planatus Fall, 1927 (Coleoptera: Dytiscidae: Colymbetinae: Colymbetini), with Phylogenetic Implications

Fig. 26. Leg chaetotaxy of right mesothoracic leg of the larva of Brychius hungerfordi Spangler (Coleoptera: Haliplidae), third instar: a) anterior; b) posterior.