Nearctodesmidae is a family of flat-backed millipedes in the order Polydesmida. These millipedes are found in northwestern North America. This family includes the species Nearctodesmus salix. The defensive secretion of this millipede consist of hydrogen cyanide, benzaldehyde, 3-methylbutanoic acid, and 2-methylbutanoic. This evidence confirms that cyanogenesis extends to the family Nearctodesmidae.

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