Morphological and genetical analyses revealed a spined loach population from Tango District, Kyoto Prefecture, to be an allotetraploid form of Cobitis striata. The former had distinctive differences in body coloration and mitochondrial DNA sequences from another allotetraploid form of Cobitis striata, found inLake Biwa, and is tentatively termed the ‘Tango tetraploid form’ of C. striata.
