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the claim

All spiders produce silk.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
6 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that all spiders produce silk?

Yes. Multiple reference works and peer-reviewed sources state directly that all spiders produce silk, with some noting that not all build webs. The claim matches what these sources assert.

Verdict: SUPPORTED · 6 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 6
Spider silk - Wikipedia
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Spider silk - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Spider_silk

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More for · 5
Early events in the evolution of spider silk genes.
2012
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Starrett, J., Garb, J. E., Kuelbs, A., Azubuike, U. O., & Hayashi, C. Y. (2012). Early events in the evolution of spider silk genes.. doi.org. https://doi.org/10.1371/journal.pone.0038084

A review of the mechanisms and functional roles of male silk use in spider courtship and mating
2018
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A review of the mechanisms and functional roles of male silk use in spider courtship and mating. (2018). doi.org. https://doi.org/10.1636/joa-s-17-093.1

Spiders are not insects
2002
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Allan, F. (2002). Spiders are not insects. archive.org. https://archive.org/details/spidersarenotins0000fowl

Encyclopedia of Entomology
2004
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Capinera, J. L. (2004). Encyclopedia of Entomology. books.google.com. http://books.google.com/books?id=AjggAQAAMAAJ&dq=All+spiders+produce+silk.&hl=&as_pt=BOOKS&source=gbs_api

Insect Attraction to Ultraviolet‐Reflecting Spider Webs and Web Decorations
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Insect Attraction to Ultraviolet‐Reflecting Spider Webs and Web Decorations. (n.d.). cir.nii.ac.jp. https://doi.org/10.2307/1940315

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