Sternolophus Solier, 1834

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 : 99

Genus Sternolophus Solier, 1834

( Figs. 2 D–E, 51B, 60–63, 64D, 65D)

Diagnosis. Larvae of this genus are distinguished from other Japanese Hydrophilini by the following combination of characters: (1) frontal lines V-shaped ( Fig. 62A ); (2) nasale with distinct teeth ( Figs. 60C , 62B ); (3) epistomal lobes rounded, projecting as far as or only slightly further than nasale ( Figs. 60C , 62B ); (4) mandibles symmetrical, with two large and one small inner teeth ( Figs. 61 B–C, 63C–D); (5) abdominal segments with rather short setiferous projections on each side ( Fig. 51B ).

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. 62. Sternolophus (Sternolophus) rufipes (Fabricius, 1792), third instar, dorsal view. A – head; B – detail of anterior margin of head capsule; C – spiracular atrium.

Fig. 60. Head capsule of Sternolophus (Sternolophus) rufipes (Fabricius, 1792), first instar. A – dorsal view; B – ventral view; C – detail of anterior margin of head capsule, dorsal view.

Fig. 61. Head appendages of Sternolophus (Sternolophus) rufipes (Fabricius, 1792), 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.

Fig. 51. Habitus of Hydrophilini species, third instar, dorsal view. A – Hydrochara affinis (Sharp, 1873); B – Sternolophus rufipes (Fabricius, 1792).