Leptinus
Müller, P.W.J., 1817
mammal nest beetles, mouse nest beetles
Species Guides
3- Leptinus americanus
- Leptinus occidentamericanus(Occidental Round Fungus Beetle)
- Leptinus orientamericanus
Leptinus is a of small beetles commonly known as mammal nest beetles or mouse nest beetles. These beetles are facultative of small mammals, with distributed across North America and Europe. The genus contains at least nine species globally, with three described species in North America.

Pronunciation
How to pronounce Leptinus: //ˈlɛptɪnəs//
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Images
Habitat
Found in nests of small mammals, where they live among nest materials and debris.
Distribution
North America (central and western United States, Alaska, Yukon, and areas east of the Mississippi River); Europe (Denmark, Norway, Sweden).
Seasonality
Activity varies by : Leptinus orientamericanus occurs during fall and winter months; Leptinus occidentamericanus occurs during spring and fall months; Leptinus testaceus shows peak during spring and summer.
Host Associations
- Blarina brevicauda - most frequent for Leptinus orientamericanus
- Scalopus aquaticus - for Leptinus orientamericanus
- Sorex trowbridgii - most frequent for Leptinus occidentamericanus
- Apodemus sylvaticus - most frequently infested for Leptinus testaceus
- Clethrionomys glareolus - for Leptinus testaceus
- Microtus agrestis - for Leptinus testaceus
- small mammals - 18 of small mammals documented as in North America
Behavior
Facultative ectoparasitism of small mammals; inhabits mammal nests and attaches to fur.
Ecological Role
of small mammals; may play a role in nest dynamics.
Sources and further reading
- BugGuide
- Wikipedia
- GBIF taxonomy match
- iNaturalist taxon
- NCBI Taxonomy
- Catalogue of Life
- A review of the ectoparasitic Leptinus beetles of North America (Coleoptera: Leptinidae)
- New Host and Locality Records for Leptinus testaceus Muller in Western Oregon (Coleoptera: Leptinidae)
- Studies on the biology and distribution of Leptinus testaceus Müller within a community of mixed small mammal species