Allotetraploid

An allotetraploid usually is formed from the hybridization of two different species, which means there are two sets of distinct chromosomes.

The GenomeScope 2.0 paper (https://www.nature.com/articles/s41467-020-14998-3) describes the difference between allotetraploids and autotetraploids. Figure 2 from that paper is below to give a better representation of how these two broad types of polyploids arise.

And, from the same paper, figure 6a, we can see an example allotetraploid

This particular histogram was made from reads from Gossypium barbadense.