Cardinal shrimp and sexual dimorphism

I have made observations on my Cardinal shrimp population in terms of gender. Along with females having deeper carapaces, I also noticed a difference in antennule length. Read the post I have made in the Shrimpnow forum below:

Hello all!

A common problem with the Cardinal shrimp Caridina dennerli is identifying the gender of each individual. Although females that have held eggs before have widened, deepened abdomens with a less obvious caridean bend, there is not yet any distinction between males and ‘virgin’ females.

I have noticed however that in my small population the males have longer antennules* than the females. Is this the case in your populations also?Remember, the male you are inspecting may very well be a virgin female; be certain before making your judgment.

This would be an example of sexual dimorphism (a behavioural or morphological difference between genders of a species). Perhaps the longer antennules in the males assist them in chemoreception of the pheromones the females release to stimulate reproduction.

Your input will be greatly appreciated.

*The antennules are the small antennae in front of the eyes of the shrimp, not the antennae which are far longer and more mobile.

Comment here with your opinion or reply on Facebook or Shrimpnow! Thank you.

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