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plural pinacocytes
(biology) Any of a group of flattened polygonal cells that together make up the pinacoderm in the dermal epithelium of sponges. quotations
Minchin (1896, 1898, 1908) also concluded that the pinacocytes could leave the dermal epithelium and become calcoblasts in both larva and adult sponge.
1961, Contributions to Marine Science, University of Wales Marine Science Laboratories, page 3
As you can see in Fig 27.7, sponges have only three types of cells in their bodies: pinacocytes (epithelial cells), choanocytes (collar cells) and amoebocytes (amoeboid cells).
1992, Martin Rowland, Biology, page 626
Despite this, in some studies the origin of new pinacocytes is not clear or is disputed (Wilson and Penney, 1930; Borojevic and Lévi, 1965).
2012, T. L. Simpson, The Cell Biology of Sponges, page 570