Summary
In several genera of Uloborid spiders the median spinnerets are provided with a cluster of specialized spools. These spools are comparable in structure with those of the cribellum, but far fewer in number. We name the newly described formation of spools the paracribellum. The histological features of the associated glands are similar to those of the cribellar glands; histochemically they seem closer to the pseudoflagelliform glands. It is suggested that paracribellar fibers impart consistency to the fibrillar secretion of the cribellum.
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Peters, H.M., Kovoor, J. Un complément à l'appareil séricigène des Uloboridae (Araneae): Le paracribellum et ses glandes. Zoomorphology 96, 91–102 (1980). https://doi.org/10.1007/BF00310079
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DOI: https://doi.org/10.1007/BF00310079