1.
Boccardia proboscidea and Boccardiella hamata (Polychaeta: Spionidae: Polydorinae), introduced mud worms new for the North Sea and Europe, respectively
2.
3.
4.
5.
A new transoceanic invasion? First records of Neomysis americana (Crustacea: Mysidae) in the East Atlantic
Schizobrachiella verrilli (Bryozoa, Cheilostomata) new to Europe
The non-indigenous window shell Theora lubrica Gould, 1861 (Bivalvia: Cardiida: Semelidae) in the delta area of the Netherlands
Opmars van de penseelkrab Hemigrapsis penicillatus De Haan, 1935 in Nederland