Pinacoderm

The pinacoderm is the outermost layer of body cells (pinacocytes) of organisms of the phylum Porifera (sponges), equivalent to the epidermis in other animals.

Structure

The pinacoderm is composed of pinacocytes, flattened epithelial cells that can expand or contract to slightly alter the size and shape of the sponge.[1] It also contains porocytes, oval-shaped cells extending from the pinacoderm to the choanoderm (the body layer containing choanocytes).

gollark: That's nice, but you still have to implement very complex sandboxing to *do* it.
gollark: The option #3 I suggested was to not have multiple users; just let the person using it edit everything and don't try some awful nonfunctional sandboxing implementation like you've made.
gollark: I mean, you could do that; that's option #1. It would be an awful solution. But you could.
gollark: Oh, actually there's option #3: just do single user mode and don't bother stopping editing of "OS" files.
gollark: Well, your current implementation lets them do stuff to OS files, so no.

References
  1. Charles F. Lytle and John R. Meyer (2005). General Zoology Laboratory Guide (Fourteenth ed.).CS1 maint: uses authors parameter (link)


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