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Maine Invasive Species Network

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Home - Identification Resources (Insects, Marine and Fish)

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The following are a list of resources to assist in accurate identification of some species (Insects, Marine and Fish) considered to be invasive in Maine. The list is not comprehensive but experts are available to assist by following the links or via contact numbers listed below.

For additional identification resources, view the

Terrestrial and Aquatic Plants Identification Page

and if you would like to consult with a specific MISN member please check the Member List for contact details.




Common Name Species Name Source
European Fire Ant Myrmica rubra Univ of Maine / Maine NAP
Gypsy Moth Lymantria dispar GMRI – Vital Signs
Spotted Wing Drosophilia Drosophilia suzukii Univ of Maine
Forest Pests including Emerald Ash Borer, Asian Longhorn Beetle, Hemlock Wooly Adelgid, Elongate Hemlock Scale, Brown Spruce Longhorn Beetle, Winter Moth, European Wood Wasp Agrilus planipennis, Anoplophora glabripennis, Adelges tsugae, Fiorinia externa, Tetropium fuscum, Operophtera brumata and Sirex noctilio Maine Forest Service

The Maine Forest Service wants to know about any of the species of forest pests listed above. Contact them at (207) 287-2431 or 1-800-367-0223 (in State).

Not sure what you have? Visit UMaine Cooperative Extension – Homeowner IPM Pest ID Page or the Insect and Plant Disease Diagnostic Lab.

Marine Invaders

Common Name Species Name Source
Asian Shore Crab Hemigrapsus sanguineus Maine Dept of Marine Res
Dead Man’s Fingers Codium fragile GMRI – Vital Signs
Lacy Crust Bryozoan Membranipora membranacea GMRI – Vital Signs
Green Crab Carcinus maenas GMRI – Vital Signs
Hairy-clawed shore crab Hemigrapsus penicillatus GMRI – Vital Signs
Chinese Mitten Crab Eriocheir sinensis GMRI – Vital Signs
Common Periwinkle Littorina littorea GMRI – Vital Signs
Rapa whelk Rapana venosa GMRI – Vital Signs

If you see Asian Shore Crab, contact Peter Thayer (Maine Dept of Marine Resources) via email at with the date, location, and number of crabs you have seen

Fish Introductions

Common Name Species Name Source
Northern Pike Esox lucius Maine Dept of Inland Fisheries

The illegal introduction of any fish into any Maine water is a Class E crime, punishable by fines. If you know of an illegal introduction, protect Maine’s fisheries and call Operation Game Thief at 1-800-253-7887 or visit the MDIFW website for more information. A list of “unrestricted” fish and wildlife species are listed by the Dept of Inland Fisheries and Wildlife for possession and sale.

Terrestrial and Aquatic Plants Identification Page.

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Image Description: Elongate Hemlock Scale

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Additional Links

Contact Information

Maine Invasive Species Network
5741 Libby Hall
Orono, Maine 04469-5741
Phone: 207.581.3188 or 1.800.287.0274 (in Maine)E-mail:
The University of Maine
Orono, Maine 04469