I. Hudec et M. Illyova, PLEUROXUS-DENTICULATUS (CRUSTACEA, ANOMOPODA, CHYDORIDAE) - A NEW INVADER IN THE DANUBE BASIN, Hydrobiologia, 368, 1998, pp. 65-73
Pleuroxus denticulatus Birge, 1879 is a new invader from Western to Ce
ntral Europe. Its occurrence in a Danube inundation (Slovak region) pr
obably corresponds with the junction of the Danube and Rhine Rivers. T
he species was found among 'the hard macrophytes' of flowing arms and
artificial ponds. A large variability was recorded in the number of va
lval denticles and in postabdominal denticulation. It is evident that
part of the N. American populations is different from European populat
ions. P. denticulatus seems to represent two sibling species. Both are
characterised by an angular distal postabdominal corner, bearing 3-4
denticles, and by valval denticles on the postero-ventral corner.