The re-identification of archive samples revealed that the first records of Corophiidae
in Hungary (1917) were erroneously attributed to Chelicorophium curvispinum; the first
species expanding its range in the River Danube was in fact C. sowinskyi, while the
actual colonization of the Danube and its tributaries by C. curvispinum took place
somewhat later. In a sample of 1943 in the River Tisza C. maeoticum was found, representing
its first and so far only record for Hungary. At present C. curvispinum is the most
widespread corophiid in the country, while the once probably continuous range of C.
sowinskyi in the Carpathian Basin has become fragmented; three isolated populations
exist in the rivers Danube, Drava, and Tisza. In 2007 C. robustum was found for the
first time in Hungary, spreading downstream in the Danube. Our records denote that
it has the potential to become an important member of the benthic macroinvertebrate
assemblage, and may have negative effects on the corophiid species already present.