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Do mollusks have a little butthole sphincter thing through which they produce their shell material, like a little 3D printer? Or is it more like they sweat a goo that sets and hardens around them? I tried googling, "snail buttholes". It didn't get me an answer. Edit: oh neat I found a helpful PowerPoint slide. The mantle secretes shell material (sweats it out). There are three layers; the periostracum (outer layer to protect from parasites), the prismatic layer (cool sounding 3d printer-esque "densely packed prisms of calcium carbonate", and the nacreous layer which is pretty and makes pearls. Thank for inspiring me to learn Pick! Macrowave Oven fucked around with this message at 13:40 on Mar 18, 2016 |
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Mar 18, 2016 13:34
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| # ¿ May 19, 2024 18:52 |
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