I do not know ornaments in this kind of specie in Spain. Here, in the majority of the Neolithic sites the ornaments are made wiht Collumbela rustica, Conus mediterraneus, Cerastroderma edule and Glycymeris glycymeris. I hope I have been helpful. Good luck.
From what I could find on a quick search on the Internet, I understand that L. pygmaeus is a species currently found only near the Danube in the area of Giurgiu (http://www.iucnredlist.org/details/156068/0).
It may be possible that the species had a larger geographic range in the past, but, just in case it didn't, I suggest you also look for information on ornaments made from other Lythoglyphus species, as close comparison material.
For example, L. naticoides was used in prehistoric times for making ornaments. Here's a paper that can get you started:
Thanks for your reply. The use of the L. naticoides by the prehistoric communities is well known. Please see one of my previous question from RG and the additional disscusions on that topic.
However, my concerns is only about the existence of the L. pygmaeus specimens in the archaeological sites from Paleolithic, Mesolithic or Neolithic.