The King lyretail, a lyretail swordtail - something else (Xiphophorus hellerii)
A lyretail swordtail with normal gonopodium - The King lyretail The translation of my article
In this case we have a fin shape, that I gave the name "Lyretail swordtail with normal gonopodium", and which I bred for a long time. Others name this breed "half lyretail". Nowdays I have begun to call them "King lyretail" because of the shape of the dorsal fin.