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Fig. 1 in Chorological and Phenological Analysis of the Water Beetle Fauna (Coleoptera: Adephaga and Polyphaga) of Northern Tunisia

Fig. 1. Map of the study area showing location of the study sites and principal regions in northern Tunisia.

Figs. 1–3 in CanthysellusBaca and Toledo (Coleoptera: Noteridae: Noterini), a New Genus of Burrowing Water Beetle from South America

Figs. 1–3. Canthysellus species, dorsal and lateral habitus. 1) C. buqueti, male; 2) C. sipaliwini, holotype, male;

Figs. 8–10. Canthysellus species, aedeagi. 8 in CanthysellusBaca and Toledo (Coleoptera: Noteridae: Noterini), a New Genus of Burrowing Water Beetle from South America

Figs. 8–10. Canthysellus species, aedeagi. 8) C. buqueti, Suriname; 9) C. sipaliwini, holotype, Suriname; 10) C. peruanus, paratype, Peru. a = median lobe, left lateral aspect, b = median lobe, dorsal aspect, c = median lobe, right lateral aspect, d = left lateral lobe, e = right lateral lobe. Scale bars = 0.25 mm.

Figs. 6–7. Canthysellus species, hind legs.6 in CanthysellusBaca and Toledo (Coleoptera: Noteridae: Noterini), a New Genus of Burrowing Water Beetle from South America

Figs. 6–7. Canthysellus species, hind legs.6) C. buqueti, male, a = setae of inner margin of metatibia, b = posterior metatibial spur, serration is diagnostic of the genus; 7) C. peruanus, paratype, male, a = setae of inner margin of metatibia. Scale bars = 0.25 mm

Figs. 4–5 in CanthysellusBaca and Toledo (Coleoptera: Noteridae: Noterini), a New Genus of Burrowing Water Beetle from South America

Figs. 4–5. Canthysellus species, pro- and metasterna and metacoxae (noterid platform) with studies of prosternal setae. 4) C. buqueti, male, a and b = variation of prosternal setae; 5) C. peruanus, paratype, male, a = enlarged view of prosternal setae. Scale bar = 0.5 mm.

Fig. 13 in CanthysellusBaca and Toledo (Coleoptera: Noteridae: Noterini), a New Genus of Burrowing Water Beetle from South America

Fig. 13. Habitats of Canthysellus species. a) Type locality of C. sipaliwini, Suriname: Sipaliwini District, stream near the Kutari River, collecting event SR13-0816-02A, b) Example habitat of C. buqueti; Suriname: Sipaliwini District, summit of Tafelberg Tepui, collecting event SR13-0816-02A.

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Fig. 3. A in New Open Aquarium System to Breed Larvae of Water Beetles (Coleoptera: Dytiscidae)

Fig. 3. A photograph of the breeding tank. ST, silicon tube for water supply. MP, mesh for partitioning. OT, outlet tube. Fresh tap water after de-chlorination is introduced as shown in Figure 2.

Fig. 3 in Diversity of Water Beetles in Picos de Europa National Park, Spain: Inventory Completeness and Conservation Assessment

Fig. 3. Historic species richness curve (1882–2005) (dots) together with the number of species collected for the first time each year (bars).

Fig. 1 in Diversity of Water Beetles in Picos de Europa National Park, Spain: Inventory Completeness and Conservation Assessment

Fig. 1. Location of Picos de Europa National Park in northern Spain. Numbers indicate locations of 2005 sampling sites: 1 = Puerto de Panderrueda (León province); 2 = Soto de Valdeón (León province); 3 = Brañarredonda (León province); 4 = Caín (León province); 5 = Posada de Valdeón (León province); 6 = Puerto de Pandetrave (León province); 7 = Begés (Cantabria province); 8 = Invernal del Texu (Asturias province); 9 = Tresviso (Cantabria province); 10 = Sotres (Asturias province); 11 = Valfrío-Tielve (Asturias province).

Fig. 2 in Diversity of Water Beetles in Picos de Europa National Park, Spain: Inventory Completeness and Conservation Assessment

Fig. 2. Species accumulation curves generated from the database with the fitted Clench function and the non-parametric estimators. Only one of each 20 points is shown for clarity.

Fig. 4 in Diversity of Water Beetles in Picos de Europa National Park, Spain: Inventory Completeness and Conservation Assessment

Fig. 4. Species accumulation curve during final sampling period (1981–2005) and fitted Clench function.

Figure 14 in REVIEW Going underwater: multiple origins and functional morphology of piercing-sucking feeding and tracheal system adaptations in water scavenger beetle larvae (Coleoptera: Hydrophiloidea)

Figure 14. Summary of the main structures related with apneustic respiratory system. A–C, Berosus decolor Knisch, 1924, light microscope photograph: A, habitus, first-instar larva, dorsal view; B; terminal spiracle, third-instar larva, dorsal view; C; detail of the abdominal spiracular trachea and tracheal gill, dorsal view. D, Berosus pallipes Brullé, 1841, abdominal spiracle, third-instar larva, dorsal view. E–H, Berosus sp., third-instar larva, SEM micrograph: E, spiracular chamber, ventral view; F; first abdominal segment bearing tracheal gill, dorsal view; G, detail of tracheal gill surface; H, abdominal spiracle. I, J, Hemiosus bruchi Knisch, 1924, third-instar larva, SEM micrograph: I, last abdominal segments, dorsal view; J, abdominal spiracle. K, Hemiosus multimaculatus (Jensen-Haarup, 1910), spiracular chamber, third-instar larva, ventral view.

Figure 15 in REVIEW Going underwater: multiple origins and functional morphology of piercing-sucking feeding and tracheal system adaptations in water scavenger beetle larvae (Coleoptera: Hydrophiloidea)

Figure 15. Phylogeny of the Hydrophiloidea with mapped evolution of tracheal system (A) and mouthparts (B, C). Two alternative ancestral state reconstructions of mouthparts, considering mouthparts of the Pelthydrus-group as: B, piercingsucking; C, chewing (only tribe Laccobiini shown). D, number of species of aquatic genera of Hydrophilidae with known larvae. Colors of branches/bars/pie-charts indicate functional morphology of mouthparts (red = piercing-sucking, blue = chewing, green = filter-feeding) and development of the tracheal system (grey = open; orange = closed).

Figure 12 in REVIEW Going underwater: multiple origins and functional morphology of piercing-sucking feeding and tracheal system adaptations in water scavenger beetle larvae (Coleoptera: Hydrophiloidea)

Figure 12. Schematic drawing of the piercing-sucking feeding mechanism: 1, sucking channel; 2, epistomal-mandibular coupling system; 3, flexible area.

Figure 13 in REVIEW Going underwater: multiple origins and functional morphology of piercing-sucking feeding and tracheal system adaptations in water scavenger beetle larvae (Coleoptera: Hydrophiloidea)

Figure 13. Summary of the main structures related with metapneustic respiratory system. A, Tropisternus latus (Brullé, 1837), spiracular chamber, first-instar larva, light microscope photograph, dorsal view. B, Helochares ventricosus Bruch, 1915, spiracular chamber, first-instar larva, light microscope photograph, dorsal view. C, Tropisternus latus (Brullé, 1837), spiracular chamber, first-instar larva, light microscope photograph, dorsal view. D, Helochares ventricosus Bruch, 1915, abdominal spiracle, first-instar larva, light microscope photograph, dorsal view. E–H, Tropisternus setiger Germar, 1824, SEM micrograph: E, spiracular chamber, third-instar larva, ventral view; F, detail of the terminal spiracle with dust filter, third-instar larva, ventral view; G, abdominal spiracle, first-instar larva, dorsal view; H, detail of the closed abdominal spiracles, first-instar larva, dorsal view. I, J, Oocyclus iguazu (Oliva 1996) third-instar larva, SEM micrograph: I, spiracular chamber, dorsal view; J, biforous abdominal spiracle, dorsal view. K, Laccobius kunashiricus Shatrovskiy, 1984, spiracular chamber, third-instar larva, SEM micrograph, dorsal view.

Figure 11 in REVIEW Going underwater: multiple origins and functional morphology of piercing-sucking feeding and tracheal system adaptations in water scavenger beetle larvae (Coleoptera: Hydrophiloidea)

Figure 11. Summary of the main structures related with piercing-sucking feeding mechanism, SEM micrograph. A, B, Berosus sp., third-instar larva: A, lobular-mandibular coupling system, dorsal view; B, detail of lobular-mandibular coupling system, ventral view. C, Laccobius (Microlaccobius) sp., third-instar larva, left epistomal lobe, dorsal view.

Figure 10 in REVIEW Going underwater: multiple origins and functional morphology of piercing-sucking feeding and tracheal system adaptations in water scavenger beetle larvae (Coleoptera: Hydrophiloidea)

Figure 10. Frame sequences of videos showing feeding behavior. A, Tropisternus latus Brullé, 1837, note that the larvae raise the head out of water while feeding. B, Hydrophilus (Dibolocelus) palpalis Brullé, 1837. C, Hemiosus dejeanii (Solier, 1849). D, Oocyclus magnifica Hebauer & Wang, 1998. See also Supporting Information, Videos S1–S4.

Figure 5 in REVIEW Going underwater: multiple origins and functional morphology of piercing-sucking feeding and tracheal system adaptations in water scavenger beetle larvae (Coleoptera: Hydrophiloidea)

Figure 5. Labroclypeal region of larvae with chewing feeding system, SEM micrograph, dorsal view. A, Tropisternus acaragua Bachmann, 1969, first-instar larva. B, Hydrochara caraboides (Linnaeus, 1758), first-instar larva. C, Hydrophilus (Dibolocelus) palpalis Brullé, 1837, second-instar larva. D, Derallus paranensis Oliva, 1981, first instar larva. E, Helochares ventricosus Bruch, 1915, first-instar larva. F, Hydroglobus puncticolle Bruch, 1915, third-instar larva. G, Dactylosternum cacti (LeConte, 1855), third-instar larva. H, Cercyon quisquilius (Linnaeus, 1761), third-instar larva, white arrow indicates labroclypeal notch. Colours: light blue, frontoclypeal region; green, gFR1, group of sensilla of nasale; violet, gFR2, group of sensilla of epistomal lobe.

Figure 1 in REVIEW Going underwater: multiple origins and functional morphology of piercing-sucking feeding and tracheal system adaptations in water scavenger beetle larvae (Coleoptera: Hydrophiloidea)

Figure 1. Head capsule of larvae with chewing (A–C) and piercing-sucking (D–I) feeding system, SEM micrograph, dorsal view. A, Hydrophilus (Dibolocelus) palpalis Brullé, 1837, second-instar larva. B, Tropisternus setiger Germar, 1824, firstinstar larva. C, Derallus paranensis Oliva, 1981, first instar larva. D, Berosus sp., third-instar larva. E, Hemiosus bruchi Knisch, 1924, third-instar larva. F, Oocyclus iguazu (Oliva 1996), third-instar larva. G, Laccobius kunashiricus Shatrovskiy, 1984, third-instar larva. H, Hybogralius hartmeyeri (Régimbart, 1908), third-instar larva, light microscope photograph. I, Epimetopus mendeli Fikáček et al. 2011, first-instar larva.

Figure 6 in REVIEW Going underwater: multiple origins and functional morphology of piercing-sucking feeding and tracheal system adaptations in water scavenger beetle larvae (Coleoptera: Hydrophiloidea)

Figure 6. Labroclypeal region of Hemiosus larvae. A, B, Hemiosus bruchi Knisch, 1924, third-instar larva, SEM micrograph, dorsal view: A, labroclypeus; B, left epistomal lobe. C–E, Hemiosus multimaculatus (Jensen-Haarup, 1910), third-instar larva, dorsal view: C, left epistomal lobe, SEM micrograph; D, detail of gFR2 serrated setae, SEM micrograph; E, left epistomal lobe, light microscope photograph. Abbreviations: EpLb, epistomal lobe; NS, nasale. Colours: light blue, frontoclypeal region; green, gFR1, group of sensilla of nasale; violet, gFR2, group of sensilla of epistomal lobe.