About the Data
Species records include data on invasions history, distribution, ecology, impact, and more. These data were gathered from published literature and targeted surveys. All records have undergone expert review, unless otherwise noted.
Species Profiles
NEMESIS includes detailed information on about 500 species of marine and estuarine of invertebrates and algae introduced to the United States. Each record contains information on taxonomy, distribution, ecology, and impacts, as well as references.
Didemnum perlucidum
Didemnum perlucidum is a widely distributed colonial tunicate. It was first described in Guadeloupe in the Caribbean, but was subsequently found in Brazil, West Africa, the Gulf of Mexico, and the Indo-Pacific, including Hawaii, Guam, and the Pacific entrance to the Panama Canal. We consider D. perlucidum to be cryptogenic (status unknown) over much of its range, but there are several recent occurrences in harbors or on man-made structures where it is known to be introduced. These include the Gulf of Mexico, Florida, Guam, Hawaii, and the Pacific Coast of Panama. It is a common member of the fouling community throughout this range and was likely introduced through ship fouling. It can overgrow a wide range of organisms, including some commercially important species such as cultured mussels.
Daily Invader for 2026-04-12