User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-94.10.19.30-20120103213632/@comment-70.54.112.127-20120103220041

If I remember correctly, it's been confirmed that it's been confirmed that Guran Miraosu is unlocked at HR 8 or 9, Nargacuga Rare Species is unlocked at HR 30, Lagiacrus Rare is unlocked at HR 70 Species and certain quests are unlocked at various multiples of 10.

I think the only person to post videos of Lagiacrus Rare Species was Mimusu1634, they were level 70 at the time. They've posted a video of Hungry Jho after but nothing else - don't know what their HR was.