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Family Nepidae - Waterscorpions

Water Scorpion - Ranatra Water Scorpion - Ranatra ID help - Ranatra buenoi Ranatra - Ranatra australis Waterscorpion sp. - Ranatra large water scorpion - Ranatra Eggs on Persicaria coccinea - Ranatra Water Stick Bugs Mating? - Ranatra
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Heteroptera (True Bugs)
Infraorder Nepomorpha (Aquatic Bugs)
Superfamily Nepoidea
Family Nepidae (Waterscorpions)
Explanation of Names
Nepidae Latreille 1802
Numbers
2 subfamilies, with 13 spp. in 3 genera in our area(1) and ~270 spp. in 15 genera worldwide(2)
Size
15-46 mm + 16-44 mm breathing tube(1)
Identification
Ranatra resemble walkingsticks
Nepa resemble giant water bugs; e. US
Curicta AZ-TX only
Range
Worldwide, by far more diverse in warmer regions(2); in our area, Ranatra are widespread (and the most commonly found), Nepa apiculata occurs in e. US, and the relatively rare Curicta species, in sw. US(3)
Habitat
fast- or slow-moving water, mostly the latter; they wait submerged on floating plants and other debris for prey(2)
Works Cited
1.American Insects: A Handbook of the Insects of America North of Mexico
Ross H. Arnett. 2000. CRC Press.
2.Biodiversity of the Heteroptera
Henry T.J. 2009. In: Foottit R.G., Adler P.H., eds. Insect biodiversity: Science and society. Oxford: Wiley-Blackwell: 223-263.
3.Borror and DeLong's Introduction to the Study of Insects
Norman F. Johnson, Charles A. Triplehorn. 2004. Brooks Cole.