Figure 14 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 14. Summary of the main structures related with apneustic respiratory system. A–C, Berosus decolor Knisch, 1924, light microscope photograph: A, habitus, first-instar larva, dorsal view; B; terminal spiracle, third-instar larva, dorsal view; C; detail of the abdominal spiracular trachea and tracheal gill, dorsal view. D, Berosus pallipes Brullé, 1841, abdominal spiracle, third-instar larva, dorsal view. E–H, Berosus sp., third-instar larva, SEM micrograph: E, spiracular chamber, ventral view; F; first abdominal segment bearing tracheal gill, dorsal view; G, detail of tracheal gill surface; H, abdominal spiracle. I, J, Hemiosus bruchi Knisch, 1924, third-instar larva, SEM micrograph: I, last abdominal segments, dorsal view; J, abdominal spiracle. K, Hemiosus multimaculatus (Jensen-Haarup, 1910), spiracular chamber, third-instar larva, ventral view.