The Southwest spring firefly (Bicellonycha wickershamorum) was proposed for listing as an endangered species under the U.S. Endangered Species Act by the Xerces Society in 2023.

The Florida intertidal firefly, also known by the common names mangrove firefly and fiddler crab firefly, is a habitat specialist found only in the mangroves and salt marshes of coastal Florida and the Bahamas. Belonging to a tropical branch of the firefly family tree, this species is the only member of its genus in the United States.