(Miers, 1881) (an isopod)

Habitat: Temperate to subtropical estuaries in shallow water; brackish water to full seawater.
Life History: Can reach 30 mm; feeds on hydroids; larvae not pelagic.
Native Range: Western Pacific Ocean region.
Nonindigenous Range: Maurice River at Bivalve, New Jersey.
Impacts: Fouls pilings and buoys.
Comments: Probable ship hull fouling introduction; possibly collected in South Carolina; has also been introduced in San Francisco Bay in the US, Europe, South America, and Australia.