Probably a male. Can you post a view of the tail from the side?
Here is a few of typical Marginateds males and females:
MALE:
FEMALE:
BOTH FROM THE TOP:
Mature males are almost always longer and narrower in the mid section when viewed from above. Females from the same view are typically wider bodied overall and heavier in weight by comparison of the same size male.
Thank you so much for your input and the posted pictures.
I took some more pics and hope to get a better view for determination.
Thank you for all your help.
Cheers,
Jens