The
mother Horta, born around
44773 BC, was the last of the
Horta species of
Janus VI until stardate 3196 in
2267. Every 50,000 years every Horta dies except for one, who watches the eggs until they begin to hatch.
Thats what it says on MA. It doesn't really go into detail, but I could have sworn they mentioned they were androgynous... wow, i spelled that right on the first try... amazing...
Anyway, I could also be completely wrong about that. The only other sources of information are non-canon, which do make a distinction between male and female.