[eng] Studiyng systematical diversity of sponges picked at the circalitoral of Mallorca and Minorca has been the main investigation interest. For this purpose, the principal procedure has combined sponges digestion before their skeletic structure analisis as a methodology to identify sponges species as well as their external details. Identifying where the samples have been located has been also an important achivement jointly with enviromental indicators which afected station gathering. The most important sampling items are: deepth, temperature and length.