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''Promecognathus'' is a genus of
ground beetle Ground beetles are a large, cosmopolitan family of beetles, the Carabidae, with more than 40,000 species worldwide, around 2,000 of which are found in North America and 2,700 in Europe. As of 2015, it is one of the 10 most species-rich animal fami ...
s in the family
Carabidae Ground beetles are a large, cosmopolitan family of beetles, the Carabidae, with more than 40,000 species worldwide, around 2,000 of which are found in North America and 2,700 in Europe. As of 2015, it is one of the 10 most species-rich animal fam ...
. There are at least two described species in ''Promecognathus''. Both species of ''Promecognathus'' are known to predate upon
Xystocheir dissecta ''Xystocheir dissecta'' is a species of flat-backed millipede in the family Xystodesmidae. It is found in North America. Subspecies These three subspecies belong to the species ''Xystocheir dissecta'': * ''Xystocheir dissecta dissecta'' (Wood, 1 ...
, which is a species of flat-backed millipede that produces
cyanide Cyanide is a naturally occurring, rapidly acting, toxic chemical that can exist in many different forms. In chemistry, a cyanide () is a chemical compound that contains a functional group. This group, known as the cyano group, consists of ...
as a chemical defense. The beetles do not avoid exposure to the defense, meaning they are likely physically resistant to cyanide.


Species

These two species belong to the genus ''Promecognathus'': * ''
Promecognathus crassus ''Promecognathus crassus'' is a species of ground beetle in the family Carabidae Ground beetles are a large, cosmopolitan family of beetles, the Carabidae, with more than 40,000 species worldwide, around 2,000 of which are found in North Ameri ...
'' LeConte, 1868 * ''
Promecognathus laevissimus ''Promecognathus laevissimus'' is a species of ground beetle in the family Carabidae Ground beetles are a large, cosmopolitan family of beetles, the Carabidae, with more than 40,000 species worldwide, around 2,000 of which are found in North A ...
'' (Dejean, 1829)


References


Further reading

*


External links

* Scaritinae Articles created by Qbugbot {{scaritinae-stub