* Red Alert species: Species not yet established in Maryland but considered to be of high risk.
Key Code	Scientific Name	Common Name	Details
2, 3	* Bythotrephes longimanus	Spiny Water Flea
1, 2, 3	Carcinus maenas	Green Crab
2	Cernuella cisalpina	Maritime Garden Snail
2, 3	Corbicula fluminea	Asian Clam
1, 2, 3	* Cornu aspersum	Brown Garden Snail
2	* Daphnia lumholtzi	Daphnia
1, 2, 3	Dreissena polymorpha	Zebra Mussel
1, 2, 3, 4	* Eriocheir sinensis	Chinese Mitten Crab
2, 3	Hemigrapsus sanguineus	Asian Shore Crab
1, 3	Heterodera glycines	Soybean Cyst Nematode
1, 3	Heterodera zeae	Corn Cyst Nematode
1, 3	Meloidogyne hapla	Northern Root Knot Nematode
1, 3	Meloidogyne incognita	Southern Root Knot Nematode
2	Orconectes virilis	Virile Crayfish
2	Orconectes rusticus	Rusty Crayfish
2	* Rapana venosa	Rapa Whelk