can you name some species from where we obtain this material?
Bombyx mori
History of silk
The species was identified as "Bombyx mori", the domesticated silkworm. Fragments of a primitive loom can also be seen from the sites of culture in , dated to about 4000 BC. 
when did silk begin to be produced in china th millennium BC
wiki:10919517
History of silk [SEP] First appearance of silk
The earliest evidence of silk was found at the sites of culture in County, , where a silk cocoon was found cut in half by a sharp knife, dating back to between 4000 and 3000 BC. The species was identified as "Bombyx mori", the domesticated silkworm. Fragments of a primitive loom can also be seen from the sites of culture in , dated to about 4000 BC. The earliest example of a woven silk fabric is from 3630 BC, and was used as wrapping for the body of a child. The fabric comes from a site in at . Scraps of silk were found in a culture site at in , dating back to 2700 BC.