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''Sphaeridium lunatum'' is a species of 
water scavenger beetle
Hydrophilidae, also known colloquially as water scavenger beetles, is a family of beetles. Aquatic hydrophilids are notable for their long maxillary palps, which are longer than their antennae. Several of the former subfamilies of Hydrophilidae ...
in the family Hydrophilidae. It is found in Europe and Northern Asia (excluding China) and North America.
References
Further reading
*External links
* Hydrophilidae Articles created by Qbugbot Beetles described in 1792 {{hydrophilidae-stub