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 psammatodes
Didemnum psammatodes is a colonial tunicate native to Northern Australia and other tropical and subtropical regions in the Indo-West Pacific. The presumed native range of D. psammatodes extends throughout East Africa to China, Japan, Fiji, Tonga, and New Zealand. It is introduced to the Atlantic where it was first recorded in Guadeloupe in 1980-1981. Since then it has been reported in several areas including Florida, Texas, Brazil, Panama, French Guiana, West Africa and others. It was probably transported to the Atlantic through shipping and hull fouling. No impacts have been reported in its introduced range.
Daily Invader for 2026-11-10