Water scorpions belonging to the genus Nepa are predatory freshwater aquatic insects of order Hemiptera. There currently five accepted species, with a Holarctic distribution: N. cinerea (Eurasia and Northern Africa), sardiniensis (Sardinia Corsica), anophthalma (endemic Movile Cave, Romania), apiculata (North America) hoffmanni (Eastern Asia). Mitochondrial nuclear genetic markers indicate corr...
