Anyone here have any idea how to sex a vampire shrimp?

[philipraposo198]

If you do please share whatever knowledge you may have. Thanks.

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[shellyx]

Hi, I keep vampire shrimp and what I've learned by research is the male has really bulky leg's (kinda look like muscles lol) while the female has slimmer front leg's. My male died so I think I'm left with 2 girls. They also say it has something to do with the spikes at the end of the leg's? Only boys have them but I'm not sure as all 3 off mine are the same.
I'm sure this is a girl

And the one at the back I think is a boy, you can see the bulky leg's on him. He was also the boss lol sadly lost him a few months ago all my shrimp are over a year old. I love keeping these guy's great fun too watch!
If you have one would love to see pictures!

55 gallon elephant nose tank.
16 gallon vampire shrimp and snails