Ambrysus mormon, the creeping water bug, is a species of creeping water bug in the family Naucoridae. It is found in the western United States and northwestern Mexico.
Subspecies There were formerly three subspecies of Ambrysus mormon but they were synonymized by Reynoso-Velasco and Sites: Ambrysus mormon heidemanni Montandon, 1910 Ambrysus mormon minor La Rivers, 1963 Ambrysus mormon mormon Montandon, 1909
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