Figures 15-18 from: Michat MC, Alarie Y, Watts CHS (2019) Dealing with a hairy beast–larval morphology and chaetotaxy of the Australian endemic diving beetle genus Spencerhydrus (Coleoptera, Dytiscidae, Cybistrini). ZooKeys 884: 53-67. https://doi.org/10.3897/zookeys.884.38391

Figures 15-18 Labium of Spencerhydrus species, instar I 15S. latecinctus, dorsal aspect 16S. latecinctus, ventral aspect 17S. pulchellus, dorsal aspect 18S. pulchellus, ventral aspect. Numbers and lowercase letters indicate primary setae and pores, respectively. Additional setae and pores not labelled. Abbreviations: LA: labium; LP1–2: labial palpomeres 1–2. Scale bar: 0.15 mm.