Allopatric speciation occurs due to change of environment, like jumping of gorilla louse to hominins and adapted to develop into hominin pubic louse. A sympatric speciation occurs in the same environment often due to polyploidy.ie., the fusion of 2 different species to form a new species. Louse speciation is not a sympatric speciation. Solution Allopatric speciation occurs due to change of environment, like jumping of gorilla louse to hominins and adapted to develop into hominin pubic louse. A sympatric speciation occurs in the same environment often due to polyploidy.ie., the fusion of 2 different species to form a new species. Louse speciation is not a sympatric speciation..