So your question is how to tell the difference between different types of guppies??
There's all sorts, since people have crossbred them and now there's like some that don't even look like a normal guppy.
To start off, there's many tail types. The most common is 'wide' tail.
Type of Tail
Guppies not only have a variety of color but different types of tail too.
1) Wild: most common tail fin
2) Pin: the middle of the tail fin made longer
3) Spade: a tail fin shaped like a spade
4) Top Sword: the upper end of the tail fin made longer
5) Bottom Sword: the lower end of the tail fin made longer
6) Double Sword: both ends of the tail fin made longer
7) Lyre Tail:shaped tail with the middle part shorter
8) Delta: a triangular shaped tail fin
9) Fan: a tail fin shaped like a fan
10)Long Fin Type
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Maybe this'll help. http

/www.arihood.com/azgenetics/guppygallery1.html
