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The Lesser Diving Beetle (Acilius sulcatus) is of the family
Dytiscidae which is in the genus Acilius. Also known as the Grooved Diving
Beetle, it occurs on all continents of the world except Antarctica. In Ireland
this water beetle has a very scattered distribution but as in other countries it
is probably under recorded due to its aquatic life style. Separate with care from
the almost identical but rarer Acilius canaliculatus by differences in
face pattern. As a strong flier, it is not confined to a single body of water. It
overwinters deep under water as an adult.
Patrick J. O'Keeffe / Raw Birds