CHROMOSOMES OF TEMNOCEPHALA-MINOR, AN ECTOSYMBIOTIC TURBELLARIAN ON AUSTRALIAN CRAYFISH FOUND IN KAGOSHIMA-PREFECTURE, WITH KARYOLOGICAL NOTES ON EXOTIC TURBELLARIANS FOUND IN JAPAN

Records of exotic turbellarian species found in Japan are reviewed fro m taxonomic and karyological viewpoints. Temnocephala minor Haswell, 1 888, an ectocommensal on a freshwater crayfish of Australia, was found from culture ponds of Cherax tenuirnanus (introduced from W. Australi a) in Kagoshima Prefecture. T. minor had the chromosome number of 2x = 18 (2sm + 2m + 2m + 2sm + 2m + 2m + 2m + 2sm + 2m). The following 3 s pecies of exotic freshwater triclads were recorded from tanks and pond s used for tropical fish culture: Dugesia austroasiatica Kawakatsu, 19 85 (2x = 16), Dugesia tigrina (Girard, 1850) (2x = 16) and Rhodax? sp. (3x = 24; 3x = 24 & 3x + 1LB + 1SB = 25 + 1SB). The following 3 speci es of exotic terrestrial triclads were recorded: Bipalium nobile Kawak atsu et Makino, 1982 (2x = 10), Bipalium kewense Moseley, 1878 (2x = 1 8), and Platydemus manokwari de Beauchamp, 1962 (n = 6, 2x = 12). An e xtensive occurrence of P. manokwari in the Southwest Islands of Japan may be due to an unexpected introduction of the animal in very recent years.