Erichson-1840
Guides
Stenus annularis
Stenus annularis is a species of rove beetle in the subfamily Steninae, described by Erichson in 1840. The genus Stenus is notable for its members' ability to glide on water surfaces using specialized gland secretions that reduce surface tension. Some species in this genus also employ a unique hunting mechanism involving the ejection of mouthparts using blood pressure to capture small invertebrate prey. Stenus annularis has a broad distribution across North America, with records from Canada and the United States.