Scydmaenidae

Ant-like stone beetles
Scydmaenus tersatus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Suborder:	Polyphaga
Superfamily:	Staphylinoidea
Family:	Scydmaenidae Leach, 1815
Subfamilies
Mastiginae Scydmaeninae and see text

Scydmaenidae is a family of small beetles, commonly called ant-like stone beetles or scydmaenids. These beetles occur worldwide, and the family includes some 4,500 species in about 80 genera.

Many scydmaenid species have a narrowing between head and thorax and thorax and abdomen, resulting in a passing resemblance to ants that inspires their common name. The largest measure just 3 millimeters long, while some very small species only reach half a millimeter in length. Scydmaenids typically live in leaf litter and rotting logs in forests, preferring moist habitats. A number of types are known to feed on oribatid mites, using "hole scraping" and "cutting" techniques to get through the mite's hard shells.

In addition to the two living subfamilies, the prehistoric subfamily Hapsomelinae, known only from fossils, has been placed here.

Selected genera

• Cephennium
• Elacatophora Schaufuss, 1884 (including Borneosabahia)
• Euconnus Thomson, 1859
• Eutheia
• Horaeomorphus Schaufuss, 1889
• Loeblites Franz, 1986
• Microscydmus Saulcy & Croissandeau, 1893
• Nevraphes
• Parastenichnaphes Franz, 1984
• Protoscydmus Franz, 1992
• Scydmaenus
• Siamites Franz, 1989
• Stenichnus Thomson, 1859
• Syndicus Motschulsky, 1851

References

• Ross H. Arnett, Jr. and Michael C. Thomas, American Beetles (CRC Press, 2001), vol. 1