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FIGURES 5–7 in A new species of Clypeodytes Régimbart, 1894 from China (Coleoptera, Dytiscidae: Bidessini)

FIGURES 5–7. Male genitalia of Clypeodytes limpidus sp. nov. 5: ventral view of median lobe, 6: lateral view of median lobe, 7: lateral view of paramere.

FIGURE 13 in A new species of Clypeodytes Régimbart, 1894 from China (Coleoptera, Dytiscidae: Bidessini)

FIGURE 13. Habitat of C. limpidus sp. nov. (A: Pool at Baoshan Prefecture, Tengchong County, near Xintanghe Village. B: Pool near Gudeng in Yunfeng Shan Mountains.).

FIGURES 8–12 in A new species of Clypeodytes Régimbart, 1894 from China (Coleoptera, Dytiscidae: Bidessini)

FIGURES 8–12. SEM of Clypeodytes limpidus sp. nov. 8: dorsal view (arrows indicate the basal pronotal striae), 9: head and pronotum (white arrow indicates the anterior bead of clypeus; black arrow indicates the occipital line), 10: lateral view of elytron (arrows indicate the sublateral carina), 11: epipleuron with oblique subhumeral carina, 12: metaventrite with a line of fine punctures right and left of a mid-line (discrimen).

FIGURES 18–21 in A new species of Clypeodytes Régimbart, 1894 from China (Coleoptera, Dytiscidae: Bidessini)

FIGURES 18–21. SEM of Clypeodytes bufo (Sharp, 1890). 18: head, pronotum and basal elytra (white arrows indicate the basal pronotal striae; black arrows indicate the basal striae on elytra), 19: lateral view of elytron (arrows indicate the lateral carina), 20: basal epipleuron with a transverse carina, 21: metaventrite with a line of coarse punctures left and right of discrimen.

FIGURE 19 in Larval morphology of the Neotropical diving beetle genus Hemibidessus Zimmermann, 1921 (Coleoptera: Dytiscidae: Bidessini)

FIGURE 19. Habitat of Hemibidessus conicus (Zimmermann, 1921): roadside ditch in the surroundings of San Ignacio sectional, Iberá Natural Reserve, Corrientes Province, Argentina (17.xi.2018).

FIGURES 17–18 in Larval morphology of the Neotropical diving beetle genus Hemibidessus Zimmermann, 1921 (Coleoptera: Dytiscidae: Bidessini)

FIGURES 17–18. Habitats of Hemibidessus conicus (Zimmermann, 1921): (17) Portillo stream, Mburucuyá NP, Corrientes Province, Argentina (18.i.2008); (18) roadside pond near Laguna Iberá park ranger office, Iberá Natural Reserve, Corrientes Province, Argentina (17.ii.2018).

FIGURES 10–16 in Larval morphology of the Neotropical diving beetle genus Hemibidessus Zimmermann, 1921 (Coleoptera: Dytiscidae: Bidessini)

FIGURES 10–16. Hemibidessus conicus (Zimmermann, 1921), instar II: (10) left antenna, dorsal aspect; (11) right antenna, ventral aspect; (12) left maxilla, dorsal aspect; (13) right maxilla, ventral aspect; (14) right mandible, dorsal aspect; (15) labium, dorsal aspect; (16) labium, ventral aspect. Numbers and lowercase letters indicate primary setae and pores, respectively. Asterisk indicates secondary seta. AN: antenna; LA: labium; MN: mandible; MX: maxilla. Scale bars = 0.05 mm.

FIGURES 1–3 in Larval morphology of the Neotropical diving beetle genus Hemibidessus Zimmermann, 1921 (Coleoptera: Dytiscidae: Bidessini)

FIGURES 1–3. Hemibidessus conicus (Zimmermann, 1921): (1) habitus of adult, dorsal aspect; (2) habitus of instar III larva, dorsal aspect; (3) head of instar III larva emphasizing nasale (arrow), dorsal aspect (mandibles seen by transparency). Scale bars = 1 mm for Figs 1–2 and 0.3 mm for Fig. 3.

FIGURES 4–9 in Larval morphology of the Neotropical diving beetle genus Hemibidessus Zimmermann, 1921 (Coleoptera: Dytiscidae: Bidessini)

FIGURES 4–9. Hemibidessus conicus (Zimmermann, 1921), instar III: (4) head, dorsal aspect; (5) head, ventral aspect; (6) abdominal segment VIII, dorsal aspect; (7) right metathoracic leg, posterior aspect; (8) left metathoracic leg, anterior aspect; (9) right urogomphus, dorsal aspect. CO: coxa; FE: femur; FR: frontoclypeus; PA: parietal; NS: natatory setae; PT: pretarsus; TA: tarsus; TI: tibia; TR: trochanter; UR8: urogomphal primary seta UR8. Scale bars = 0.15 mm.

Fig. 2 in A preliminary checklist of the minute diving beetles of Belize (Coleoptera: Dytiscidae: Bidessini)

Fig. 2. Distribution of Bidessini in Belize: A, Anodocheilus francescae Young, 1974; B, Anodocheilus guatemalensis (Zaitzev, 1910); C, Bidessodes elongatus (Sharp, 1882); D, Bidessonotus caraibus (Chevrolat, 1863); E, Bidessonotus mexicanus Régimbart, 1895; F, Bidessonotus mobilis J. Balfour-Browne, 1947; G, Bidessonotus pollostus Young, 1990; H, Bidessonotus vicinus Young, 1990; I, Neobidessus obtusoides Young, 1977; J, Neobidessus persimilis (Régimbart, 1895); K, Uvarus spretus (Sharp, 1882). Yellow dots indicate literature records and red dots studied material.

Fig. 4 in A preliminary checklist of the minute diving beetles of Belize (Coleoptera: Dytiscidae: Bidessini)

Fig. 4. Pond in the transition zone between savannah and tropical wet forest in the Bladen Nature Reserve (Toledo) with layer of leaf litter and a vegetation of water lilies. At this site Anodocheilus francescae, A. guatemalensis, Bidessonotus mobilis and B. vicinus were collected. © Kevin Scheers.

Fig. 5 in A preliminary checklist of the minute diving beetles of Belize (Coleoptera: Dytiscidae: Bidessini)

Fig. 5. Shallow pool in partly mowed, small marsh near Punta Gorda (Toledo) with Anodocheilus francescae, Bidessonotus caraibus, Bidessonotus vicinus and Uvarus spretus. © Kevin Scheers.

Fig. 1 in A preliminary checklist of the minute diving beetles of Belize (Coleoptera: Dytiscidae: Bidessini)

Fig. 1. Dorsal habitus of A, Anodocheilus francescae Young, 1974; B, Bidessodes elongatus (Sharp, 1882) and C, Bidessonotus mobilis J. Balfour-Browne, 1947; scale bars = 1 mm. © Florence Trus.

Fig. 3 in A preliminary checklist of the minute diving beetles of Belize (Coleoptera: Dytiscidae: Bidessini)

Fig. 3. Pond in the savannah of the Deep River Forest Reserve (Toledo), the typical habitat of Anodocheilus francescae and Neobidessus obtusoides. At this site both species co-occurred with Bidessonotus vicinus. © Kevin Scheers.

Fig. 6 in A preliminary checklist of the minute diving beetles of Belize (Coleoptera: Dytiscidae: Bidessini)

Fig. 6. Pond in the forest of the Bladen Nature Reserve (Toledo) with a thick layer of decaying leafs, the typical habitat of Bidessonotus mobilis. At this site the species co-occurred with the more eurytopic B. vicinus and a single specimen of Uvarus spretus. © Kevin Scheers.

FIGURE 9 in Tepuidessus grulai sp. nov. from Acopán Tepui in Venezuela (Coleoptera: Dytiscidae: Hydroporinae: Bidessini)

FIGURE 9. Habitat of Tepuidessus breweri. Shallow puddles on rocks of summit plateau of Roraima Tepui (Fotos: M. Hornburg).

FIGURE 6 in Tepuidessus grulai sp. nov. from Acopán Tepui in Venezuela (Coleoptera: Dytiscidae: Hydroporinae: Bidessini)

FIGURE 6. Tepuidessus grulai sp. nov., reduced metathoracic wing (A), lateral view of last ventrite in female (B) and pronotum, punctation and basal stria as well as basal stria on elytron (C).

FIGURE 8 in Tepuidessus grulai sp. nov. from Acopán Tepui in Venezuela (Coleoptera: Dytiscidae: Hydroporinae: Bidessini)

FIGURE 8. Distribution of Tepuidessus breweri (black dot) and Tepuidessus grulai sp. nov. (red square) in southern Venezuela.

FIGURE 7 in Tepuidessus grulai sp. nov. from Acopán Tepui in Venezuela (Coleoptera: Dytiscidae: Hydroporinae: Bidessini)

FIGURE 7. Tepuidessus grulai sp. nov., median lobe of aedeagus and paramere in lateral view (A) and median lobe in ventral view (B)

FIGURE 10 in Tepuidessus grulai sp. nov. from Acopán Tepui in Venezuela (Coleoptera: Dytiscidae: Hydroporinae: Bidessini)

FIGURE 10. Habitat of Tepuidessus grulai sp. nov. Puddles on rocks of summit plateau of Acopán Tepui (Foto: Peter Fenďa).