Lesser diving beetle

Acilius sulcatus
Predaceous diving beetles (Dytiscidae)

♀

Lesser diving beetleon RikenMon's Nature-Guide

CC-BY 2.0 rights : Gailhampshire

Oval shaped water beetle with a flat yellow-brown shield with black stripes. The legs are yellow-brown with darker coloured, stronger and flattened rear legs. The ♀ has 4 vertical grooves on her shield and the ♂ has a smooth shield. The ♂ also has sucking toes to attach to the female while mating. 

It is an able swimmer but can fly as well.

⇔ l. 16-18 mm

LA:
Various predaceous diving beetles are difficult to separate.
≈ The DYTISCUS MARGINALIS (Great diving beetle) is larger and with a yellow edge around its shield.

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