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Lesser Water Boatman adult - Corixa punctata, click for a larger image, photo licensed for reuse CCASA2.5
Adult photo ©2005 Piet Spaans
Click for a larger image

Size for size possibly the loudest
mating call of any species ?

Lesser Water Boatman - Corixa punctata
Family - Corixidae
Also known as - Water Crickets, Back swimmers

The Lesser Water Boatman is a widespread and common herbivorous insect found in stationary or very low flowing bodies of water feeding on algae and dead plant material.  One of several Water Boatman species to be found in the UK, adults are 6–15mm (0.25–0.6in) long and boat shaped (from where it gets its common name), they are an overall brown, finely striped and speckled yellow.  They have finely compound black eyes.

Three pairs of specialised legs, the oar like hind pair which are used for movement, are longer than the others and covered in fine hairs which also help them float on the surface.  The clawed center leg pair is use to anchor it to vegetation and detritus underwater, whilst its front pair is used to gather food and move it to its mouth parts.  They breathe underwater by hanging at the water surface trapping air around the body and under their wing cases, this give them a shiny appearance.  Mating is a short aerial flight after the males have attracted females by stridulating a practice used by Grasshoppers and Crickets from where the Lesser Water Boatman gets another of its common names.  Their calls are reputed to be one of the loudest relative to the size of the creature.

Similar to the Water Boatman Notonecta glauca which swims on its back, the Lesser Water Boatman swims on its front.  Another Water Boatman species the Micronecta scholtzi are also commonly called "Lesser Water Boatman", but these are much smaller at 2.5mm (0.1in) long and more rounded, an overall green mottled with brown, and coarse coppery coloured compound eyes.

Lesser Water Boatman larvae - Corixa punctata, click for a larger image
Three photos above ©2018–
Lesser Water Boatman larvae - Corixa punctata, click for a larger image Lesser Water Boatman larvae - Corixa punctata, click for a larger image
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