please look them on the heads

I think left male, right female

Both with bumps, males(?)

No bump - no male?
I've tried to get some detail shots and merge the pics, but the result is not so good as I've hoped - left male, right female

Can someone here see this bumps at his own P. anguillaris, too? Or have I too much fantasy?

Sadly the female died, and today I've only one of the old "bumpmale" and one new female (not sure, but definitly no bump)
Thomas