Polyandry resulting in multiply-sired litters has been documented in the majority of elasmobranch species examined to date. Although commonly observed, reasons for this mating system remain relatively obscure, especially in batoids. The round stingray . . .

Utilizing matings of single-spore isolates of collections of Panellus stypticus from far eastern USSR, New Zealand, Japan and eastern North America, the geographic range of interbreeding populations was ascertained to include all these locations. Cult . . .