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FIGURE 57 in A revision of the Neotropical genus Sacosternum Hansen (Hydrophilidae: Sphaeridiinae: Megasternini)

FIGURE 57. Strict consensus tree of the 22 most parsimonous trees resulted from the phylogenetic analysis of the Sacosternum species.

FIGURES 50–55 in A revision of the Neotropical genus Sacosternum Hansen (Hydrophilidae: Sphaeridiinae: Megasternini)

FIGURES 50–55. Meso- and metaventrite. 50: S. auribleps; 51: S. emissarium; 52: S. lebbinorum; 53: Sacosternum sp. B; 54: S. delta; 55: S. inconnivum.

FIGURES 23–26. Aedeagophores. 23–25 in A revision of the Neotropical genus Sacosternum Hansen (Hydrophilidae: Sphaeridiinae: Megasternini)

FIGURES 23–26. Aedeagophores. 23–25: S. lebbinorum, holotype; 26: S. cf. lebbinorum from Brazil, Rondonia, SW of Ariquemes. 23: whole aedeagus, dorsal view; 24, 26: detail of the apical portion of the median lobe; 25: detail of apical sclerite after clearing of the aedeagus in KOH.

FIGURES 4–12 in Sphaerocetum gen. n., a new genus of the Protosternini from Peninsular Malaysia (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 4–12. Sphaerocetum malayanum sp. n. 4: hind wing; 5: head in lateral view; 6: head in dorsal view; 7: head in ventral view; 8: antenna; 9: posterior leg; 10: male sternite 9; 11: aedeagus; 12: male sternite 8. Abbreviations: AAanterior anal vein; AP—posterior anal vein; CuA—anterior cubital vein; MP—posterior median vein; RA—anterior radius; RP—posterior radius; ScA—anterior subcostal vein.

FIGURES 1–3 in Sphaerocetum gen. n., a new genus of the Protosternini from Peninsular Malaysia (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 1–3. Sphaerocetum malayanum sp. n., general habitus. 1: dorsal view; 2: lateral view; 3: ventral view. Abbrevations: alr—anterolateral ridge of metaventrite.

FIGURES 13–17 in Sphaerocetum gen. n., a new genus of the Protosternini from Peninsular Malaysia (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 13–17. Sphaerocetum malayanum sp. n., SEM micrographs. 13: detail of mouthparts; 14: prosternum; 15: meso- and metaventrite; 16: mesoventrite, mesepimeron and mesepisternum; 17: posterior tarsus. Abbreviations: mamandibular apex.

FIGURES 31–37 in Chimaerocyon gen. nov., a morphologically aberrant myrmecophilous genus of water scavenger beetle (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 31–37. Phylogenetic position of Chimaerocyon. 31—Bayesian tree based on four genes concatenated (branches with posterior probability values). 32—mapping of relevant tribal-level characters on the tree (full circle = gain, crossed circle = loss). 33–37—diagnostic tribal-level characters illustrated on selected representatives of the Sphaeridiinae. Abbreviations (numbers refer to characters in Fig. 32): angr—antennal groove, comcl—compact antennal club, curt—curved metatibia, elpr—elevated median portion of prosternum, excly—excised lateral portion of clypeus (exposed antennal bases), llob—lateral lobes of clypeus, msuc—male sucker on maxilla, pgr—grooves for reception of procoxae, pros—well-developed prosternum, wepi—wide epipleuron posteriorly.

FIGURES 6–14 in Chimaerocyon gen. nov., a morphologically aberrant myrmecophilous genus of water scavenger beetle (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 6–14. Morphological details of Chimaerocyon shimadai (6–13) and C. sumatranus (14). 6—ventral view, 7—egg drawn to scale with Fig. 6, 8—aedeagus of the holotype, 9—male sternite 8 of the holotype, 10—male sternite 9, 11—hind wing of the holotype, 12–14—abdominal apex (12—male holotype of C. shimadai, 13—female paratype of C. shimadai, 14— female holotype of C. sumatranus). Abbreviations (numbers refer to characters in Fig. 32): msuc—male suckers on maxilla, elpr—elevated median portion of prosternum, wepi—wide epipleuron posteriorly, shtars—shortened tarsus, abdem— abdominal emargination.

FIGURES 23–30 in Chimaerocyon gen. nov., a morphologically aberrant myrmecophilous genus of water scavenger beetle (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 23–30. Detailed morphology of Chimaerocyon shimadai (23–26, 28–30) and C. sumatranus (27). 23—meso- and metathorax in ventral view, 24—mesoventrite in lateral view, 26—median portions of meso- and metaventrite in ventral view, 26–27—right elytral apex, 28—metatarsus, 29—metatarsal claws, 30—detail of apical portion of elytral series 1–2.

FIGURES 1–5 in Chimaerocyon gen. nov., a morphologically aberrant myrmecophilous genus of water scavenger beetle (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 1–5. Habitus of Chimaerocyon species. 1–3—male paratype of Chimaerocyon shimadai (1—dorsal view, 2—lateral view, 3—frontal view). 4–5—holotype of C. sumatranus (4—dorsal view, 5—frontal view).

FIGURES 15–22 in Chimaerocyon gen. nov., a morphologically aberrant myrmecophilous genus of water scavenger beetle (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 15–22. Detailed morphology of Chimaerocyon shimadai (15–21) and C. sumatranus (22). 15—head in dorsal view, 16—head in ventral view, 17—prothorax and head in ventral view, 18—clypeus in lateral view, 19, 22—mentum, 20— profurca, 21—elevated mesal portion of prosternum. Abbreviations (numbers refer to those used in Fig. 32): cly—clypeus, msuc—male sucker on maxilla.

FIGURES 15–23 in Review of the Chinese species of the genus Coelostoma Brullé, 1835 (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 15–23. Aedeagus of Chinese Coelostoma. 15: C. fallaciosum, 16: C. vitalisi, 17–18: C. vividum (17: specimen from Guangdong: Heishiding; 18: paratype from Sumatra: Bengealis), 19: C. orbiculare, 20: C. bifidum sp. nov., 21: C. turnai (specimen from Hunan), 22: C. hajeki sp. nov., 23: C. hongkongene sp. nov.

FIGURES 32–33 in Review of the Chinese species of the genus Coelostoma Brullé, 1835 (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 32–33. Aedeagus of Coelostoma stultum. 32: from Guangdong, 33: specimen from Xizang identified as C. sulcatum by Pu (1988).

FIGURES 1–8 in Review of the Chinese species of the genus Coelostoma Brullé, 1835 (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 1–8. Habitus, morphology and habitats of Chinese Coelostoma. 1–6: Coelostoma bifidum sp. nov. (1–2: habitus in dorsal and lateral views; 3: ventral morphology; 4: specimens hiding in grass root during the day (in Jiangxi: Jinggangshan), 5: active specimen of the surface of wet rock at night (in Guangdong: Heishiding); 6: detail of meso-metaventral elevation). 7: detail of pronotal and elytral punctation of C. hongkongense sp. nov.; 8: punctation of lateral portion of elytra of C. gentilii sp. nov.

FIGURES 9–14 in Review of the Chinese species of the genus Coelostoma Brullé, 1835 (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 9–14. Characters distinguishing the subgenera of Coelostoma occurring in China. 9–10: subgenus Lachnocoelostoma (C. bifidum sp. nov.); 11–12: subgenus Holocoelostoma (C. stultum); 13–14: subgenus Coelostoma s.str. (C. orbiculare). 9, 11, 13: mesofemur in ventral view; 10, 12, 14: posterior margin of andominal ventrite 5.

FIGURES 24–31 in Review of the Chinese species of the genus Coelostoma Brullé, 1835 (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 24–31. Aedeagus of Chinese Coelostoma and related species. 24: C. coomani, 25: C. gentilii sp. nov., 26: C. phallicum, 27: C. huangi sp. nov., 28: C. martensi (paratype from Nepal), 29: C. wui, 30: C. vagum, 31: C. horni from southern Yunnan: Xishuangbanna).

FIGURES 7–14 in A new aberrant species of Nipponocercyon from the mountains of southeastern China (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 7–14. Morpology of Nipponocercyon satoi sp. nov., SEM micrographs of female paratypes. 7: head in dorsal view; 8: head in ventral view; 9: anterior tibia, dorsal view; 10: antenna in ventral view; 11: prosternum; 12: prothorax and anterior leg in ventral view; 13: whole body in lateral view; 14: detail of the punctation of the pronotum. Abbreviations: ang: antennal grooves of prothorax; aps: antennal peg-like sensilla; prt: the free prosternal "tooth" on prosternum-hypomeron border; pfd: profemoral depression.

FIGURES 15–20 in A new aberrant species of Nipponocercyon from the mountains of southeastern China (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 15–20. Morpology of Nipponocercyon satoi sp. nov., SEM micrographs of female paratypes. 15: meso- and metathorax in ventral view, detail; 16: detail of mesoventral plate and metaventral process; 17: meso- and metathorax in ventral view, general view; 18: posterior leg, ventral view; 19: elytron, lateral view; 20: detail of basal portion of elytron and scutellat shield. Abbreviations: grp: grooves for reception of procoxae; mtr: ridge of the metaventral process.

FIGURES 1–6 in A new aberrant species of Nipponocercyon from the mountains of southeastern China (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURES 1–6. Nipponocercyon satoi sp. nov. 1–4: general habitus of the female paratype (1: dorsal view, 2: ventral view, 3: lateral view, 4: frontal view). 5–6: aedeagus of the holotype (5: phallobase and parameres, 6: median lobe).

FIGURE 21 in A new aberrant species of Nipponocercyon from the mountains of southeastern China (Coleoptera: Hydrophilidae: Sphaeridiinae)

FIGURE 21. Distribution and general habitus of known species of Nipponocercyon. Habitus photos shown to scale. Figure of N. sichuanicus adopted from Fikáček et al. (2012), that of N. shibatai from Hoshina & Fikáček (2010).