Hydrochara Berthold, 1827

Minoshima, Yûsuke & Hayashi, Masakazu, 2011, Larval morphology of the Japanese species of the tribes Acidocerini, Hydrobiusini and Hydrophilini (Coleoptera: Hydrophilidae), Acta Entomologica Musei Nationalis Pragae (suppl.) 51, pp. 1-118 : 83

Genus Hydrochara Berthold, 1827

( Figs. 2 A–B, 51A, 52–55, 64A–B, 65B, 67B)

Diagnosis. This genus is distinguished from Japanese Hydrophilini by the following combination of characters: (1) frontal lines V-shaped ( Fig. 54A ); (2) nasale without distinct teeth, slightly serrate ( Figs. 52C , 55A ); (3) inner face of scape strongly serrate in first instar ( Fig. 53A ); (4) three setae (AN7–9) close to antennal sensorium (SE1) ( Fig. 53A ); (5) mandibles symmetrical, with two inner teeth ( Figs. 53 B–C, 55D–E); (6) abdominal segments with long setiferous projections on each side ( Figs. 2 A–B, 51A).

Figures

Fig. 2. Habitus of the larvae of Hydrophilini, dorsal view. A–B – Hydrochara affinis (Sharp, 1873): A – first instar; B – third instar. C – Hydrophilus acuminatus Motschulsky, 1854, third instar. D–E – Sternolophus (Sternolophus) rufipes (Fabricius, 1792): D – second instar; E – third instar.

Fig. 54. Hydrochara affinis (Sharp, 1873), third instar. A – head, dorsal view; B – spiracular atrium, dorsal view.

Fig. 52. Head capsule of Hydrochara affinis (Sharp, 1873), first instar.A – dorsal view; B – ventral view; C – detail of anterior margin of head capsule, dorsal view.

Fig. 55. Hydrochara affinis (Sharp, 1873), third instar. A – clypeolabrum, dorsal view; B – antenna, dorsal view; C – antenna, detail of outer membranous area on pedicel; D–E – mandibles, dorsal view; F – maxilla, dorsal view; G – maxilla, ventral view; H – labium, dorsal view; I – labium, ventral view.

Fig. 53. Head appendages of Hydrochara affinis (Sharp, 1873), first instar. A – antenna, dorsal view; B–C – mandibles, dorsal view; D – maxilla, dorsal view; E – maxilla, ventral view; F – labium, dorsal view; G – labium, ventral view.