Abstract
In the 2002 North American freshwater limpet Ferrissia fragilis (Tryon, 1863) was recorded for the first time in the continental waters of Black Sea Region. This is considered to be a continuation of invasion in the Black Sea Region as this species was previously introduced into Crimean Peninsula reservoirs in the early 20th century. A juvenile form of F. fragilis found in Central Crimea was previously described as the freshwater limpet Ancylus lacustris brevis (Puzanov 1925). According to the rules and recommendations (8B and 8.3) of the International Code of Zoological Nomenclature we point that this information can not be used as nomenclatural act (recommendation of ICZN about providing of first publication with nomenclature act as printing on paper). Since 2002, F. fragilis has been sampled in the freshwaters of the Dniestr Delta. It was observed that this invader could sustain the extreme conditions of an unusually cold winter (2005-2006).
Highlights
Studying of the alien freshwater limpets in Europe presents many fascinating problems to the investigator, who has to consider their distribution, invasive history, descent, and chronology of their spread
A recent investigation using molecular taxonomical methods (Walther et al 2006) has revealed that these small European Ancylidae are single Nearctic (North American) species, Ferrissia fragilis (Tryon 1863)
This paper is based mainly on material collected by the author in the Dniestr River Basin (SouthWestern Ukraine) and from ornamental aquaria. This is deposited in the mollusc collection of the Odessa Branch Institute of Biology of the Southern Seas (OB IBSS)
Summary
Studying of the alien freshwater limpets in Europe presents many fascinating problems to the investigator, who has to consider their distribution, invasive history, descent, and chronology of their spread. A recent investigation using molecular taxonomical methods (Walther et al 2006) has revealed that these small European Ancylidae are single Nearctic (North American) species, Ferrissia fragilis (Tryon 1863). It can be recognized that these limpets occurred in European waters earlier than were recorded as invasive species.
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