Figure 5 in REVIEW Going underwater: multiple origins and functional morphology of piercing-sucking feeding and tracheal system adaptations in water scavenger beetle larvae (Coleoptera: Hydrophiloidea)

Figure 5. Labroclypeal region of larvae with chewing feeding system, SEM micrograph, dorsal view. A, Tropisternus acaragua Bachmann, 1969, first-instar larva. B, Hydrochara caraboides (Linnaeus, 1758), first-instar larva. C, Hydrophilus (Dibolocelus) palpalis Brullé, 1837, second-instar larva. D, Derallus paranensis Oliva, 1981, first instar larva. E, Helochares ventricosus Bruch, 1915, first-instar larva. F, Hydroglobus puncticolle Bruch, 1915, third-instar larva. G, Dactylosternum cacti (LeConte, 1855), third-instar larva. H, Cercyon quisquilius (Linnaeus, 1761), third-instar larva, white arrow indicates labroclypeal notch. Colours: light blue, frontoclypeal region; green, gFR1, group of sensilla of nasale; violet, gFR2, group of sensilla of epistomal lobe.