calamistrum

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A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England

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calamistrum

arachnid anatomy

Learn about this topic in these articles:

structure in spiders

In spider: Silk
…also have a comb (calamistrum) on the metatarsus of the fourth leg. The black widow is one such comb-footed spider (family Theridiidae). The calamistrum combs the silk that flows from the cribellum, producing a characteristically woolly (cribellate) silk.
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