It seems a calanoid copepod, but it is not completely shown in the picture.

 Unfortunately don't have any better picture.

But I checked some pictures of calanoid and it seems alike I saw in lab.

Thanks a lot Sir for your kind help :)

welcome

I´m agree with the colleges 

Seems cyclops

Dear Himmat Singh Sir,

Thanks for your cooperation. It's look like cyclops but quite rigid and larger entity than cyclops and more similar to Calanoid copepod as Marcos sir mentioned. I also found some more specimen of this species in later classes and quite sure it's a species of Diaptomus genus.

And sorry for such bad quality picture. Thank you again sir for your kind help.