Mollies – Poecilia Latipinna
Guppies – Poecilia Reticulata
Endler’s – Poecilia sp. Endler's
Swordtails – Xiphophorus helleri
Platies - Xiphophorus maculatus
Variable Platy – Xiphophorus variatus
Platies, Variable Platies , and swordtail are so very closely related that they will often breed resulting to many color varieties of xiphophorus that we enjoyed.
Mollies and Guppies are not that common crossed, but there are some rumor that they do successfully crossed them, but they tend to be sterile and eventually dies at young age.
Endler’s and Guppies are so very closely related that they will often breed resulting to many color varieties available at the local fish store (LFS). Note: Before buying endler’s make sure that it is really an endler’s not just a feeder guppies.
There are documented cases of Common Guppy males impregnating Molly females. Pictures were published in Dr. Axelrod's "Encyclopedia of Aquarium Fishes." They proved to be infertile and developed tumors as they matured and subsequently died.
If the gonopodium structure is incorrect and crossing is impossible,The gonopodium structure of males is the primary way to the genus of a fish. This is what's used to place packets of sperm on the genital opening of the female, if they do not match then a crossing is impossible.
Looking at the genus two species belong to is a good guideline for predicting whether they will be able to hybridize or not. However, it isn't a sure guide. Both platies and swords are in the genus Xiphophorus and both mollies and guppies are in the genus Poceilia. But, clearly, the ease with which these fish hybridize and their genetic compatibility is not comparable.
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