a sievelike spinning organ in certain spiders that occurs between the spinnerets
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How to use cribellum in a sentence
In the male the cribellum is rudimentary, and there is no calamistrum.The Common Spiders of the United States | James Henry Emerton
By means of the calamistrum these spiders comb from the cribellum a band of loose threads which form a part of their webs.
They have in front of the usual spinnerets an additional organ, which is named the cribellum (Fig. 102, c).
There are two quite distinct types of regular webs made by spiders possessing a cribellum and a calamistrum.
The cribellum is large for the size of the spiders and can generally be plainly seen just in front of the other spinnerets.The Common Spiders of the United States | James Henry Emerton