They were not, however, intended to evolve from the Progenitor Race featured in "The Chase".
And yet they were represented by the exact same actress! Coincidence? Enquiring minds want to know!
I'm left confused, because in the episode The Search Odo asks his people if he was once an infant and they said in away he was, so that means they do reproduce somehow.
I think it means he was scooped from the shallow end of the lake. *grin*