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A review of the Cercyon (Coleoptera: Hydrophilidae: Sphaeridiinae) of the Greater Antilles

The representatives of the genus Cercyon Leach occurring in the Greater Antilles are reviewed. Ten species are recorded, of which five are described here as new: C. gimmeli sp. nov. (Dominican Republic), C. armatipenis sp. nov. (Dominican Republic), C. taino sp. nov. (Dominican Republic), C. sklodowskae sp. nov. (Jamaica) and C. spiniventris sp. nov. (Dominican Republic). Full occurrence data, additional images and COI barcode sequences are submitted to open access on-line depositories in an effort to provide access to complete data.

Fig. 6 in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 6. Cercyon undulipennis sp. nov. A – dorsal and lateral habitus of paratype from China: Yunnan: Gaoligong Shan; B–D – male genitalia of the holotype (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).

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Figure 3 in Cercyon Leach, 1817 (Coleoptera: Hydrophilidae: Sphaeridiinae) from Brazil: new species and records

Figure 3. Cercyon curi sp. nov. Abdomem, (A) abdominal ventrites, scale = 0.5 mm; terminalia (B–F), (B) sternite 9; aedeagus (C–F), (C) lateral view; (D) dorsal view; (E) Phallobase and parameres in dorsal view; (F) median lobe in dorsal view, scale = 0.2 mm.

Fig. 2. Cercyon divisus Hebauer, 2002. A–C in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 2. Cercyon divisus Hebauer, 2002. A–C – genitalia of specimen from Nepal: Taplejung Distr. (NMPC) (A – tergmen; B – median lobe; C – sternite 9). D–H – variability in the shape of male sternite 9 (D – China: Yunnan: Habashan; E – Nepal: Karnali Prov.; F – China: Yunnan: Maoniuping; G – China: Yunnan: Yulongshan; H – China: Sichuan: Moxi). I–P – ventral morphology (I–L – specimen from India: West Bengal: Darjeeling; M–P – specimen from China: Yunnan: Maoniuping): I, M – meso- and metaventrite; J, N – detail of mesoventral plate; K, O – mentum; L, P – prosternum and antennal groove.

Fig. 5 in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 5. Cercyon kubani sp. nov. A–B dorsal and lateral habitus of paratypes from China: Yunnan: Weibaoshan; C–E – male genitalia of the holotype (C – tegmen; D – median lobe; E – sternite 9). F–I – ventral morphology (F – meso- and metaventrite; G – detail of mesoventral plate; H – prosternum and antennal groove; I – mentum).

Fig. 1 in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 1. Dorsal and lateral habitus of Cercyon divisus Hebauer, 2002. A, C–D – specimens from China: Yunnan, Yulongshan; B – specimen from Nepal: Taplejung Distr., upper Simbua Khola near Tseram.

Fig. 14 in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 14. East Palaearctic and Oriental Cercyon species which may be confused with members of C. unipunctatus group (dorsal and lateral view of pronotum and elytra, thorax and legs omitted). A – C. lateralis (Marsham, 1802); B – C. ustus Sharp, 1874 (paralectotype from Nagasaki); C – C. ovillus Motschulsky, 1860; D – C. sericatus Hebauer, 2002 (paratype from Nepal: Gopte near Tharepati); E – C. alinae Ryndevich, 2004; F – C. berlovi Shatrovskiy, 1999; G – C. hanseni Jia, Fikáček & Ryndevich, 2011.

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).

Fig. 9. Cercyon unipustulatus Nakane, 1982. A in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 9. Cercyon unipustulatus Nakane, 1982. A – dorsal and lateral habitus of the paratype from Japan: Chiba Pref., Abiko; B–D – male genitalia (B – tegmen; C – median lobe; D – sternite 9). E–H – ventral morphology of the paratype (E – meso- and metaventrite; F – detail of mesoventral plate; G – mentum; H – prosternum and antennal groove).

Fig. 3 in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 3. Cercyon flavimarginatus sp. nov. A – dorsal and lateral habitus of the paratype from China: Yunnan: Zhondian; B–D – male genitalia of the holotype (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).

Fig. 8 in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 8. Cercyon unipunctatus (Linnaeus, 1758). A – dorsal and lateral habitus; 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).

Fig. 10. Cercyon verus Shatrovskiy, 1989. A–B in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 10. Cercyon verus Shatrovskiy, 1989. A–B – dorsal and lateral habitus of specimens from Kuril Islands; C–E – male genitalia (C – tegmen; D – median lobe; E – sternite 9). F–I – ventral morphology (F – meso- and metaventrite; G – detail of mesoventral plate; H – prosternum and antennal groove; I – mentum).

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Figs 4–7. Cercyon symbion. 4–6 in New records of water beetles (Coleoptera: Helophoridae, Hydrophilidae, Hydraenidae) from Commander Islands

Figs 4–7. Cercyon symbion. 4–6 –male genitalia, dorsal view: 4 – tegmen with parameres;

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Fig. 11 in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 11. Cercyon unipunctatus (Linnaeus, 1758), variability of the elytral coloration.

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Fig. 13 in A review of the Asian species of the Cercyon unipunctatus group (Coleoptera: Hydrophilidae: Sphaeridiinae)

Fig. 13. Known distribution of the species of C. unipunctatus species group in Asia.

FIGURES 13–14 in Cercyon castaneipennis sp. n., an overlooked species from Europe (Coleoptera: Hydrophilidae)

FIGURES 13–14. Distribution of Cercyon castaneipennis (13) and C. obsoletus (14) on a 100 km UTM grid. The record of C. obsoletus from northern Iran is outside the area shown.

FIGURES 1–2 in Cercyon castaneipennis sp. n., an overlooked species from Europe (Coleoptera: Hydrophilidae)

FIGURES 1–2. Habitus of Cercyon castaneipennis (1) and C. obsoletus (2). Scale bar 1.0 mm. Photographs by Th. Heijerman.

FIGURES 3–6 in Cercyon castaneipennis sp. n., an overlooked species from Europe (Coleoptera: Hydrophilidae)

FIGURES 3–6. Elytral colour pattern and antennae of Cercyon castaneipennis (3, 5) and C. obsoletus (4, 6). 3–4. Elytral colour pattern, scale bar 0.5 mm; 5–6. Antenna, scale bar 0.2 mm.

FIGURES 7–12 in Cercyon castaneipennis sp. n., an overlooked species from Europe (Coleoptera: Hydrophilidae)

FIGURES 7–12. Male genitalia of Cercyon castaneipennis (7–9) and C. obsoletus (10–12), dorsal aspect. 7, 10. Basal piece and parameres; 8, 11. Penis; 9, 12. Sternite IX. Scale bar 0.2 mm.