pinacocyte pinacoderm 2011-04-22T07:33:24Z The pinacoderm is the outer most layer of cells (pinacocytes) in the phylum Porifera (sponges), similar to the epidermis in other organisms. The pinacocytes are on the external surface of the sponge body and characterized as an epithelial layer of flattened cells. cjm compare with: "Surface lined by pinacocytes (ex and en in figure)." [http://www.portol.org/thesaurus] body layer sponge surface