The Rhanthunkeana (ron than con' a) are referred as the Ranthia.

They are from the distant in terms of your universe, but they have full mastery over the Time Portal System. (they are responsible, in part, for many of your crop circles).

The Ranthia are more advanced technologically and spiritually that are the Zeta, and they have been involved in your Earth culture since its beginning.

They have been the Guardians in many ways and have helped protect your species and planet form interference both multidimensionally and galactically.

The Ranthia also posses the ability to "park" between dimensional frequencies so as to appear invisible to your world.

Like the Zeta, the Ranthia often appear in your system as light formations, especially those manifest in spherical form.

They are not fully "matter based," biologically speaking, The physicality can be compared to what in your system appears to be water. That is, their "organic form" has the properties of fluidity you associate with the element water. 

They can take on many forms because of this fluidity of form, yet they are conscious, sentient, intelligent race of beings.

(Voyagers I – Page 10)