Progradungula otwayensis (Gradungulidae) holding a snare made from silk spun from its cribellum
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Cribellum literally means "little sieve", and in biology the term generally applies to anatomical structures in the form of tiny perforated plates.
In certain groups of diatoms it refers to microscopically punctured regions of the frustule, or outer layer.
In certain groups of spider species, so-called cribellate spiders, the cribellum is a silk spinning organ. Unlike the usual spinnerets of spiders, the cribellum consists of one or more plates covered in thousands of tiny spigots, tiny holes that hardly project from the surface, in contrast to the elongated spigots that project from spinnerets.[1] These minute spigots produce extremely fine fibers, merely tens of nanometres thick, which are combed out by the spider's calamistrum, producing silk with a woolly texture. The fibers are so small in diameter that they are strongly subject to Van der Waals forces.[2] In addition, the fibres have a surface that absorbs waxes from the epicuticle of insect prey on contact. This creates a powerful adhesion without any liquid glue that tends to dry out.[3]
The spider cribellum is a functional homolog of the anterior median spinnerets of Mesothelae and Mygalomorphae, which do not have a cribellum.
^Foelix, Rainer F. (1996). Biology of Spiders (2 ed.). Oxford University Press. pp. 118–122.
^Hawthorn, Anya C.; Opell, Brent D. (2002). "Evolution of adhesive mechanisms in cribellar spider prey capture thread: evidence for van der Waals and hygroscopic forces". Biological Journal of the Linnean Society. 77 (1): 1–8. doi:10.1046/j.1095-8312.2002.00099.x.
^ Bott, Raya A. Baumgartner, Werner Bräunig, Peter Menzel, Florian Joel, Anna-Christin. Adhesion enhancement of cribellate capture threads by epicuticular waxes of the insect prey sheds new light on spider web evolution. Proceedings of the Royal Society B. 31 May 2017. doi:10.1098/rspb.2017.0363
Cribellum literally means "little sieve", and in biology the term generally applies to anatomical structures in the form of tiny perforated plates. In...
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Callancyla cribellum is a species of beetle in the family Cerambycidae. It was described by Bates in 1855. Bezark, Larry G. A Photographic Catalog of...
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History Museum Bern. Retrieved 2019-04-27. Bertkau, P. (1882). "Über das Cribellum und Calamistrum". Ein Beitrag zur Histologie, Biologie und Systematik...
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of silk tend to ensnare prey. Since newly hatched uloborids lack the cribellum needed to produce cribellate sticky silk, their webs have a fundamentally...
such as the "RTA clade", the "Oval Calmistrum" clade or the "Divided Cribellum" clade. Older names previously used formally are used as clade names,...
cribellate araneoid. Kuntner et al. themselves considered the presence of cribellum to be a piece of evidence that M. jurassica was not in fact a nephilid...
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