Ambrysus amargosus, the Ash Meadows naucorid, is a small insect of the Naucoridae family. They were first identified by Ira La Rivers in 1953. They live in the waters of Point of Rocks Springs, in the east-central region of Ash Meadows National Wildlife Refuge in Nye County, Nevada. Because of changes to their habitat, this species lives only in a few small stream channels. Scientific over-collection and introduced predatory fish are the main threats to these insects. They are the first species to be listed as threatened under the Endangered Species Act (ESA). They are also currently protected under the Ash Meadows National Wildlife Refuge (NWR)

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