Promecognathus Crassus
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''Promecognathus'' is a genus of
ground beetle Ground beetles are a large, cosmopolitan distribution, cosmopolitan family (biology), 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 ...
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 ...
. There are at least two described species in ''Promecognathus''. Both species of ''Promecognathus'' are known to predate upon '' Xystocheir dissecta'', which is a species of flat-backed millipede that produces
hydrogen cyanide Hydrogen cyanide (formerly known as prussic acid) is a chemical compound with the chemical formula, formula HCN and structural formula . It is a highly toxic and flammable liquid that boiling, boils slightly above room temperature, at . HCN is ...
as a chemical defense. The beetles do not avoid exposure to the defense, meaning they are likely physically resistant to hydrogen cyanide.


Species

These two species belong to the genus ''Promecognathus'': * '' Promecognathus crassus'' LeConte, 1868 * '' Promecognathus laevissimus'' (Dejean, 1829)


References


Further reading

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External links

* Scaritinae Articles created by Qbugbot {{scaritinae-stub