''Stenus zunicus'' is a species of

rove beetle The rove beetles are a family (Staphylinidae) of beetles, primarily distinguished by their short elytra (wing covers) that typically leave more than half of their abdominal segments exposed. With roughly 63,000 species in thousands of genera, the ...

described by

Thomas Lincoln Casey Jr. Thomas Lincoln Casey Jr. (February 19, 1857 – February 6, 1925) was an American army engineer and entomologist who was noted for his work on Coleoptera. He was the eldest son of Brigadier General Thomas Lincoln Casey (1831–1896), who served ...

in 1884. This species can locomote on top of water.

References

Steninae Beetles described in 1884 Taxa named by Thomas Lincoln Casey Jr. {{Staphylinidae-stub