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Fig. 7 in Description of immature stages of Laccobius kunashiricus, with a key to genera of the Laccobiini based on larval characters (Coleoptera: Hydrophilidae)

Fig. 7. Third instar larva of Laccobius kunashiricus Shatrovskiy, 1984.A – head, dorsal view; B – prosternal sclerite, ventral view; C – mesonotal sclerites, dorsal view; D – spiracular atrium, dorsal view.

Fig. 7 in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 7. Cercyon quisquilius (Linnaeus, 1761). A – dorsal and lateral habitus of the specimen from China: Yunnan: Lijiang; B–D – male genitalia (B – tegmen; C – median lobe; D – sternite 9). E–H – ventral morphology (E – meso- and metaventrite; F – detail of mesoventral plate; G – mentum; H – prosternum and antennal groove).

Figs 39–46. Cryptopleurum pygmaeum d in A review of the genus Cryptopleurum from China (Coleoptera: Hydrophilidae)

Figs 39–46. Cryptopleurum pygmaeum d'Orchymont, 1913. 39–41 – habitus (39 – dorsal; 40 – ventral; 41 – lateral view). 42 – lateral part of right elytron (A – seventh stria, B – eighth stria). 43–44 – aedeagus (43 – dorsal, 44 – ventral view). 45 – meso- and metaventrite. 46 – pronotal punctation.

Figs 32–38. Cryptopleurum ferrugineum Motschulsky, 1863. 32–34 in A review of the genus Cryptopleurum from China (Coleoptera: Hydrophilidae)

Figs 32–38. Cryptopleurum ferrugineum Motschulsky, 1863. 32–34 – habitus (32 – dorsal; 33 – ventral; 34 – lateral view). 35 – lateral part of right elytron (A – seventh stria; B – eighth stria). 36 – meso- and metaventrite. 37–38 – aedeagus (37 – dorsal, 38 – ventral view).

Figs 9–16. Cryptopleurum subtile Sharp, 1844. 9–11 in A review of the genus Cryptopleurum from China (Coleoptera: Hydrophilidae)

Figs 9–16. Cryptopleurum subtile Sharp, 1844. 9–11 – habitus (9 – dorsal; 10 – ventral; 11 – lateral view). 12 – dorsolateral part of left elytron (A – eighth stria; B – seventh stria). 13–14 – aedeagus (13 – dorsal; 14 – ventral view). 15 – metaventrite. 16 – pronotal punctation.

Figs 1–8. Cryptopleurum minutum Fabricius, 1775. 1–3 in A review of the genus Cryptopleurum from China (Coleoptera: Hydrophilidae)

Figs 1–8. Cryptopleurum minutum Fabricius, 1775. 1–3 – habitus (1 – dorsal; 2 – ventral; 3 – lateral view). 4 – pronotal punctation. 5 – dorsolateral part of right elytron (A – seventh stria; B – eighth stria). 6 – mesoventral plate and metaventrite; 7–8 – aedeagus (7 – dorsal; 8 – ventral view).

Figs 24–31. Cryptopleurum sulcatum Motschulsky, 1863. 24–26 in A review of the genus Cryptopleurum from China (Coleoptera: Hydrophilidae)

Figs 24–31. Cryptopleurum sulcatum Motschulsky, 1863. 24–26 – habitus (24 – dorsal; 25 – ventral; 26 – lateral view). 27–28 – aedeagus (27 – ventral, 28 – dorsal view). 29 – dorsolateral part of right elytron (A – seventh stria, B – eighth stria). 30 – meso- and metaventrite. 31 – pronotal punctation.

Figs 17–23. Cryptopleurum coomani d in A review of the genus Cryptopleurum from China (Coleoptera: Hydrophilidae)

Figs 17–23. Cryptopleurum coomani d'Orchymont, 1926. 17–19 – habitus (17 – dorsal; 18 – ventral; 19 – lateral view). 20 – dorsolateral part of right elytron (A – seventh stria; B – eighth stria). 21 – aedeagus (dorsal, lateral and ventral view). 22 – meso- and metaventrite. 23 – pronotal punctation.

Figs. 37–43 in The Hydrophiloid beetles of Socotra Island (Coleoptera: Georissidae, Hydrophilidae)

Figs. 37–43. Male genitalia of the Hemisphaera species (37, 39–40, 42 – aedeagus; 38, 41, 43 – sternite 9). 37–38 – H. guignoti Schaefer, 1975 (Algeria, 'Philippeville' [= Skikda], coll. NMPC); 39–41 – H. miltiadis Sahlberg, 1908 (39 – paratype, Lesbos, coll. IRSNB; 40–41 – Turkey, Izmir, coll. IRSNB); 41–43 – H. lima Orchymont, 1941 (paratype, Tanzania, Ukerewe, Victoria Nyanza, coll. IRSNB).

Figs. 1–6 in The Hydrophiloid beetles of Socotra Island (Coleoptera: Georissidae, Hydrophilidae)

Figs. 1–6. Georissus maritimus sp. nov. (paratypes). 1 – pronotum and elytra in dorsal view; 2 – head, dorsal view; 3–4 – detail of pronotum (3 – dorsal view; 4 – dorsolateral view); 5 – elytron, dorsolateral view; 6 – abdomen.

Figs. 7–8 in The Hydrophiloid beetles of Socotra Island (Coleoptera: Georissidae, Hydrophilidae)

Figs. 7–8. Genitalia of Socotran endemic Georissus species. 7 – G. maritimus sp. nov. (a, b: two different ventral views of the same aedeagus; c: lateral view); 8 – G. nemo sp. nov., ventral view.

Figs. 23–25 in The Hydrophiloid beetles of Socotra Island (Coleoptera: Georissidae, Hydrophilidae)

Figs. 23–25. Hemisphaera socotrana sp. nov. 23–24 – general habitus (23 – dorsal view, 24 – lateral view); 25 – type locality (stream in wadi Ayhaft).

Figs. 15–22. Socotran endemic Georissus species and their habitats. 15–16 – G in The Hydrophiloid beetles of Socotra Island (Coleoptera: Georissidae, Hydrophilidae)

Figs. 15–22. Socotran endemic Georissus species and their habitats. 15–16 – G. maritimus sp. nov. (15 – dorsal view; 16 – lateral view). 17–18 – G. nemo sp. nov. (17 – dorsal view; 18 – lateral view). 19–20 – the sand tongue 3 km NE of Shuab, type locality of G. maritimus sp. nov. (19 – general view of the habitat; 20 – satellite view showing the position of the locality); 21–22 – the stream at Arhar, type locality of G. nemo sp. nov. (21 – general view of the habitat; 22 – satellite view showing the position of the locality).

Figs. 9–14 in The Hydrophiloid beetles of Socotra Island (Coleoptera: Georissidae, Hydrophilidae)

Figs. 9–14. Georissus nemo sp. nov. (9–13 – paratype; 14 – holotype). 9 – pronotum and elytra in dorsal view; 10 – head, dorsal view; 11–12 – detail of pronotum (11 – dorsal view; 12 – dorsolateral view); 13 – elytron, dorsolateral view; 14 – abdomen.

Figs. 34–36 in The Hydrophiloid beetles of Socotra Island (Coleoptera: Georissidae, Hydrophilidae)

Figs. 34–36. Male genitalia of the holotype of Hemisphaera socotrana sp. nov. 34–35 – aedeagus (34 – general view; 35 – detail of parameres and median lobe); 36 – sternite 9.

Figs. 26–33 in The Hydrophiloid beetles of Socotra Island (Coleoptera: Georissidae, Hydrophilidae)

Figs. 26–33. Hemisphaera socotrana sp. nov. 26 – head, ventral view; 27 – detail of mentum; 28 – meso- and metaventrite; 29 – antenna; 30 – prosternum; 31 – head, dorsal view; 32 – lateral portion of pronotum; 33 – abdomen.

Figs. 36–41 in Horelophus walkeri rediscovered: adult morphology and notes on biology (Coleoptera: Hydrophilidae)

Figs. 36–41. Legs of Horelophus walkeri Orchymont, 1913. 36 – male, apex of protibia and basal part of protarsus; 37 – male, mesotarsomeres 1–3; 38 – female, mesotarsomeres 1–3; 39 – male, metatarsomere 5 and pretarsus in relaxed condition; 40 – male, metatarsomeres 1–3; 41 – male, metatarsomere 5 and pretarsus with exposed unguitractor.

Figs. 18–24 in Horelophus walkeri rediscovered: adult morphology and notes on biology (Coleoptera: Hydrophilidae)

Figs. 18–24. Morphology of Horelophus walkeri Orchymont, 1913. 18 – head, dorsal view (inset: detail of punctation of frons); 19 – head, ventral view; 20 – maxillary palpomere 4, dorsal view; 21 – detail of mouthparts; 22 – prothorax, posterior view; 23 – prothorax, ventral view; 24 – right side of pronotum.

Figs. 11–17 in Horelophus walkeri rediscovered: adult morphology and notes on biology (Coleoptera: Hydrophilidae)

Figs. 11–17. Mouthparts and head appendages of Horelophus walkeri Orchymont, 1913. 11 – labrum, dorsal view; 12 – labrum, ventral view (epipharynx); 13 – maxilla; 14 – mentum and prementum; 15 – mandible; 16–17 – antenna (16 – male, 17 – female).

Figs. 1–4. Horelophus walkeri Orchymont, 1913. 1–2 in Horelophus walkeri rediscovered: adult morphology and notes on biology (Coleoptera: Hydrophilidae)

Figs. 1–4. Horelophus walkeri Orchymont, 1913. 1–2 – general habitus in dorsal and lateral view (photo M. Fikáček); 3–4 – individuals on the wet rock surfaces at Dead Horse Creek, Marlborough (photo R. Leschen).