Editing Beetle (section)

===Thorax===
The thorax is [[segmentation (biology)|segmented]] into the two discernible parts, the pro- and pterothorax. The pterothorax is the fused meso- and metathorax, which are commonly separated in other insect species, although flexibly articulate from the prothorax. When viewed from below, the thorax is that part from which all three pairs of legs and both pairs of wings arise. The abdomen is everything posterior to the thorax.<ref name=insenc/> When viewed from above, most beetles appear to have three clear sections, but this is deceptive: on the beetle's upper surface, the middle section is a hard plate called the [[pronotum]], which is only the front part of the thorax; the back part of the thorax is concealed by the beetle's [[insect wing|wings]]. This further segmentation is usually best seen on the abdomen.{{Citation needed|date=June 2023}}<ref>Kusinitz, M. (2021). Beetles. In K. H. Nemeh & J. L. Longe (Eds.), ''The Gale Encyclopedia of Science'' (6th ed., Vol. 1). Gale. 531-536. Gale Document Number: CX8124400293</ref>

[[File:Acilius sulcatus.gemeiner furchenschwimmer.jpg|thumb|''[[Acilius sulcatus]]'', a diving beetle with hind legs adapted as [[Animal locomotion#Swimming|swimming]] limbs]]