This is a non-exclusive list of online resources and databases that may be useful for CMIST assessments.

General

Encyclopedia of Life
The Marine Life Information Network (MarLIN)
Google Scholar

Taxonomy

Integrated Taxonomic Information System (ITIS)
World Register of Marine Species (WoRMS)

Non-indigenous species

Global

Global Invasive Species Database (GISD)
CABI Invasive Species Compendium

North America

Washington Department of Fish & Wildlife Invasive Species Information
USGS Nonindigenous Aquatic Species
SERC National Exotic Marine and Estuarine Species Information System (NEMESIS)
California Non-native Estuarine and Marine Organisms (Cal-NEMO)
The Rhode Island Marine & Estuarine Invasive Species Site (RIMEIS)
US National Park Service Marine Invasive Species Database
The Exotics Guide: Non-Native Marine Species of the North American Pacific Coast
New York Invasive Species Clearinghouse
Invasive Species Centre
Great Lakes Aquatic Nonindigenous Species Information System (GLANSIS)

Europe

European Network on Invasive Alien Species (NOBANIS)
Delivering Alien Invasive Species Inventories Europe (DAISIE)
CIESM Atlas of Exotic Species in the Mediterranean
AquaNIS Information system on aquatic non-indigenous and cryptogenic species