Regimbartia attenuata, commonly known as Japanese water scavenger beetle, is a species of water scavenger beetle[1] widely distributed in the Old World,[2] from northern Australia and Japan westward to the countries of Arabian Peninsula, including Oman and Yemen.

[3][4][5][6] It is found in India, Sri Lanka, Pakistan, Philippines, Sunda Islands, Australia, Japan, Formosa, Indonesia, Cambodia, Cochin-china, and Indochina.

Thorax and abdomen consists with short to long, membranous projections.

Body greyish white in color with brownish sclerotised parts.

Head capsule is yellowish brown which is subquadrate, attenuated posteriad.

Adult beetles are identified as the natural hosts of the fungus Autoicomyces falcifer.