In Season 6's Cure, we see Egeria, a Goa'uld queen that is creating symbiotes.
However in Season 1's Hathor, we also see the eponymous Goa'uld queen creating symbiotes.
How can both of these be Goa'uld queens? One of them is a non-human while one of them is apparently a typical Goa'uld inhabiting a human (which lacks any obvious symbiote-creating organs). One might assume that Egeria is a symbiote inhabiting some non-human animal, but Teal'c recognizes it immediately as a Goa'uld queen, suggesting that this animal is a Goa'uld queen, rather than a species inhabited by one.
I suppose I just need some clarification. What exactly is a Goa'uld queen? How can both Egeria and Hathor be queens? If they are both symbiotes, why are they different than other Goa'uld?