You might get better results googling for 'gonopodium' vs. 'Guppy's Junk'.Here i am thinking that the tubular anal fin was the males junk! LOL! I guess in a way it may very well be
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If you search hard enough, you'll find out that they have hooks in the end too.
Finally, some livebearers have left and right handed ones too... Like the Anableps Anableps (4-eyed fish)