Abstract
In sediment samples collected in the Oosterschelde, a marine embayment in the southwest of The Netherlands (southern North Sea), nine specimens of a non-native myodocopid ostracod were found. The ostracods were identifed as the North American species Eusarsiella zostericola (Cushman, 1906), previously introduced to southeastern England, probably with imported American oysters.
Highlights
At least three species introduced to southeast England with oysters from North America have subsequently been recorded from The Netherlands
According to Kornicker (1975), E. zostericola arrived in southeast England with imports of Atlantic oysters Crassostrea virginica (Gmelin, 1791) from North America
The most likely introduction vector of Eusarsiella zostericola to The Netherlands is the importating of shellfish from abroad
Summary
At least three species introduced to southeast England with oysters from North America have subsequently been recorded from The Netherlands. The first samples of a muddy-sand sediment mixed with shells and shell grit, taken in 2012, yielded the first ostracods of the order Myodocopida from The Netherlands. They do not belong to any of the native species known from the North Sea area. Their similarity to a species introduced to England with oysters from North America was immediately evident and this was checked with the pertinent literature
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