Metasaur is simply a random unnofficial name assigned to a group of arboreal volant tetrapods that lived in amber tree cavities often getting trapped when hibernating or when pregnant. This type of clean amber is difficult to find as it is not part of the amber mass on the trunk of the tree but from amber that has flooded a hollow in the tree. If you find difficulty seeing the fourth digit or the wingclaw then please look at the micro ct slices or close up hi res images now made freely available for download following our open source principles or email us for fuller data.
Below is a Hi Res image of the "reverse" side of the Romeo in amber. Please feel free to right click and download the image to your computer should you wish to zoom in on details at your leisure and convenience.