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Family Naucoridae - Creeping Water Bugs

Creeping water bug - Pelocoris Creeping water bug - Pelocoris P. femoratus? - Pelocoris femoratus P. femoratus? - Pelocoris femoratus Naucorid - Pelocoris Bentsen Naucorid - Pelocoris Bentsen Naucorid, dorsal view - Pelocoris water bug?
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Heteroptera (True Bugs)
Family Naucoridae (Creeping Water Bugs)
Numbers
23 Nearctic species in 5 genera.
Remarks
The five Nearctic genera are:

Ambrysus, Cryphocricos, Limnocoris, Pelocoris, Usingerina.

Beware! In An Introduction to the Study of Insects, it's noted that "[Naucoridae] bite quite readily--and painfully--when handled."
See Also
Bugs in Belostomatidae are superficially similar but much larger.