Scuba-Diving Bugs Can Inflict Envenoming Bites in Swimming Pools, Lakes, and Ponds  James H. Diaz, MD, DrPH  Wilderness & Environmental Medicine  Volume 27, Issue 1, Pages 165-167 (March 2016) DOI: 10.1016/j.wem.2015.10.001 Copyright © 2016 Wilderness Medical Society Terms and Conditions

Figure 1 The backswimmer (phylum Arthropoda, order Hemiptera, family Notonectidae). A, Backswimmer swimming on its keel-shaped back and paddling with its oar-shaped hind-legs on or near a freshwater body surface. Source: Wikipedia (public domain). B, Backswimmer upside down and awaiting a meal just under the water surface. Note the prominent beak or proboscis, which can inflict a painful, envenoming bite (solid white arrow). Source: Wikipedia (public domain). Photographer: E. van Herk. Wilderness & Environmental Medicine 2016 27, 165-167DOI: (10.1016/j.wem.2015.10.001) Copyright © 2016 Wilderness Medical Society Terms and Conditions

Figure 2 The water boatman (phylum Arthropoda, order Hemiptera, family Corixidae). A, Water boatman swimming on its ventral abdomen and paddling with its oar-shaped hind-legs near a freshwater body bottom. This water boatman has anchored itself at depth by hooking onto bottom vegetation with one of its mid-legs equipped with a curved appendage. Source: Wikipedia (public domain). B, The water boatman deploying its buoyancy-compensating air bubbles tucked under its wings and thoracoabdomen (solid white arrow). Source: Missouri Department of Conservation. Public domain. Wilderness & Environmental Medicine 2016 27, 165-167DOI: (10.1016/j.wem.2015.10.001) Copyright © 2016 Wilderness Medical Society Terms and Conditions