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Fig. 3. Sphaeridium sundense, new species. A–D in A New Species of Sphaeridium Fabricius, 1775 (Coleoptera: Hydrophilidae) from Indonesia

Fig. 3. Sphaeridium sundense, new species. A–D) Male genitalia: A) Abdominal tergite IX, dorsal, B) Median lobe and tegmen, C) Ventral detail of apex of median lobe, D) Lateral profile of median lobe and tegmen. E) Male protarsus, F) Mesoventral process, ventral. Abbreviations: bs = basal segment of tegmen; cor = corona; ls = lateral struts of tergite IX; mkp = mesoventral protrusion; ml = median lobe; mr = median ridge of ventrite IX; oc = outer claw; par = paramera; pml = posterior mesoventral lip; S5 = tarsomere 5; T10 = tergite X; V9 = sternite IX.

Fig. 4. Pronotal coloration, left lateral view. A in A New Species of Sphaeridium Fabricius, 1775 (Coleoptera: Hydrophilidae) from Indonesia

Fig. 4. Pronotal coloration, left lateral view. A) Sphaeridium sundense, new species, B) S. quinquemaculatum.

Fig. 1 in A New Species of Sphaeridium Fabricius, 1775 (Coleoptera: Hydrophilidae) from Indonesia

Fig. 1. Sphaeridium sundense, new species, habitus. A) Dorsal, B) Ventral, C) Lateral, D) Posterior.

Fig. 2 in A New Species of Sphaeridium Fabricius, 1775 (Coleoptera: Hydrophilidae) from Indonesia

Fig. 2. SEM of Sphaeridium sundense, new species. A) Head, ventral, inset shows microrugae on surface of mentum, B) Pronotum, dorso-lateral, inset shows microsculpture on surface, C) Proventrite, D) Mesoventral keel, ventral oblique, E) Metaventral field. F–G) Detail of types of microsculpture: F) Granulate microsculpture on pronotum, G) Rugose microsculpture (microrugae) on metaventral field.

Fig. 5 in A New Species of Sphaeridium Fabricius, 1775 (Coleoptera: Hydrophilidae) from Indonesia

Fig. 5. Morphology of Sphaeridium species. A, C, E) Sphaeridium sundense, new species, B, D, F) S. quinquemaculatum. A–B) Procoxae, C–D) Mesoventral keel, ventral view, E–F) Mesoventral keel, oblique view.

FIGURE 6 in Primary chaetotaxy of the larval head capsule and head appendages of the Hydrophilidae (Coleoptera) based on larva of Hydrobius fuscipes (Linnaeus, 1758)

FIGURE 6. Head appendages of Enochrus coarctatus (A), Cercyon convexiusculus (B, C, G, H), Hydrophilus piceus (D) and Berosus signaticollis (E, F). (A, B) left mandible, dorsal view; (C) right mandible, dorsal view; (D) left antenna, dorsal view; (E, G) labium, ventral view; (F, H) labium, dorsal view.

FIGURE 4 in Primary chaetotaxy of the larval head capsule and head appendages of the Hydrophilidae (Coleoptera) based on larva of Hydrobius fuscipes (Linnaeus, 1758)

FIGURE 4. Head capsule of Hydrophilus piceus (A, B), Laccobius striatulus (C, E) and Cercyon convexiusculus (D). (A) head capsule, dorsal view; (B, C) head capsule, ventral view; (D, E) detail of anterior margin of head capsule. EB: egg bursters.

FIGURE 5 in Primary chaetotaxy of the larval head capsule and head appendages of the Hydrophilidae (Coleoptera) based on larva of Hydrobius fuscipes (Linnaeus, 1758)

FIGURE 5. Left maxilla of Coelostoma orbiculare (A) and Sphaeridium sp. (B, C). (A, B) dorsal view; (C) ventral view.

FIGURE 2 in Primary chaetotaxy of the larval head capsule and head appendages of the Hydrophilidae (Coleoptera) based on larva of Hydrobius fuscipes (Linnaeus, 1758)

FIGURE 2. Head capsule of Hydrobius fuscipes. (A) lateral view; (B) detail of anterior margin of the head capsule.

FIGURE 3 in Primary chaetotaxy of the larval head capsule and head appendages of the Hydrophilidae (Coleoptera) based on larva of Hydrobius fuscipes (Linnaeus, 1758)

FIGURE 3. Head appendages of Hydrobius fuscipes. (A) left antenna, dorsal view; (B) left maxilla, dorsal view; (C) left maxilla, ventral view; (D) right mandible, dorsal view; (E) labium, dorsal view; (F) labium, ventral view.

Figure 6 in Revision of Chaetarthria Stephens (Coleoptera: Hydrophilidae) in China, with a key to the species in the Oriental Region

Figure 6. Aedeagi. (a–b) Chaetarthria saundersi d'Orchymont: (a) from Hong Kong; (b) from Jiangxi. (c) Chaetarthria kuiyanae sp. nov; (d) Chaetarthria almorana Knisch; (e) Chaetarthria malickyi Hebauer; (f–h) Chaetarthria indica d'Orchymont: (f) from Jinggangshan, Jiangxi; (g) from Hong Kong; (h) from Jinggangshan, Jingxi.

Figure 5. Chaetarthria indica d in Revision of Chaetarthria Stephens (Coleoptera: Hydrophilidae) in China, with a key to the species in the Oriental Region

Figure 5. Chaetarthria indica d'Orchymont. (a–b) Habitus: (a) lateral; (b) ventral; (c) elytra; (d) head and pronotum; (e) pronotum, right; (f) abdomen.

Figure 4 in Revision of Chaetarthria Stephens (Coleoptera: Hydrophilidae) in China, with a key to the species in the Oriental Region

Figure 4. Chaetarthria malickyi Hebauer. (a–c) Habitus: (a) dorsal; (b) ventral; (c) laterodorsal; (d) head and pronotum; (e) elytra; (f) pronotum, right.

Figure 1. Chaetarthria saundersi d in Revision of Chaetarthria Stephens (Coleoptera: Hydrophilidae) in China, with a key to the species in the Oriental Region

Figure 1. Chaetarthria saundersi d'Orchymont. (a–c) Habitus: (a) dorsal; (b) lateral; (c) ventral; (d) elytra; (e) pronotum, left.

Figure 2 in Revision of Chaetarthria Stephens (Coleoptera: Hydrophilidae) in China, with a key to the species in the Oriental Region

Figure 2. Chaetarthria kuiyanae sp. nov. (a–c) Habitus: (a) dorsal; (b) lateral; (c) ventral; (d) elytra; (e) pronotum, left; (f) head, ventral.

Figure 3 in Revision of Chaetarthria Stephens (Coleoptera: Hydrophilidae) in China, with a key to the species in the Oriental Region

Figure 3. Chaetarthria sp. (a–b) Habitus (a) lateral; (b) ventral; (c) apical portion of elytra; (d) head and prosternum, ventral. Chaetarthria almorana Knisch. (e–f,h) Habitus: (e) dorsal; (f) lateral; (h) ventral; (g) pronotum, left; (i) elytra.

Figure 13 in Larval morphology of the genus Hydrocassis Fairmaire (Coleoptera: Hydrophilidae)

Figure 13. Habitats (A,B) and egg case (C) of Hydrocassis species. (A) Collecting locality of Hydrocassis lacustris Sharp, Japan: small stream near Abe-tôge, Umegashima, Aoi-ku, Shizuoka-shi, Shizuoka prefecture, altitude 1380 m, 22 June 2008; (B) collecting locality of Hydrocassis uncinata Ji et Schödl, Laos: upstream of Nam Xan River, NW Mount Phou Samsoun, Xieng Khouang province, altitude 2050 m, 13 May 2008; (C) egg case of H. lacustris Sharp, same locality as (A).

Figure 12 in Larval morphology of the genus Hydrocassis Fairmaire (Coleoptera: Hydrophilidae)

Figure 12. Thoracic structures of Hydrocassis species. (A) Prosternum of Hydrocassis jengi, second instar, ventral view; (B) mesothoracic leg of H. jengi, second instar, anterior view; (C) metathoracic leg of Hydrocassis lacustris, first instar, anterior view; (D) mesothoracic leg of H. lacustris, third instar, anterior view.

Figure 7 in Larval morphology of the genus Hydrocassis Fairmaire (Coleoptera: Hydrophilidae)

Figure 7. Head appendages of Hydrocassis lacustris Sharp, third instar. (A) Right antenna, dorsal view; (B,C) mandibles, dorsal view; (D) left maxilla, dorsal view; (E) left maxilla, ventral view; (F) labium, dorsal view; (G) labium, ventral view. Black square indicates additional sensilla.

Figure 11 in Larval morphology of the genus Hydrocassis Fairmaire (Coleoptera: Hydrophilidae)

Figure 11. Head appendages of Hydrocassis uncinata Ji et Schödl, third instar. (A) Right antenna, dorsal view; (B, C) mandibles, dorsal view; (D) left maxilla, dorsal view; (E) left maxilla, ventral view; (F) labium, dorsal view; (G) labium, ventral view. Black square indicates additional sensilla.