Figure 7.21 Polyploidy in salamanders. Triploid species can occur when one individual that experiences incomplete meiosis and produces a diploid gamete mates with another individual that experiences normal meiosis and produces a haploid gamete. The Tremblay’s salamander is an all-female, triploid species that arose through sympatric speciation from the mating of the blue-spotted salamander and the Jefferson salamander.