yellow-spotted millipede

Harpaphe haydeniana

Member of cherry millipedes (family Xystodesmidae)
flat-backed millipedes (order Polydesmida)
worm-like millipedes (infraclass Helminthomorpha)
chilognathan millipedes (subclass Chilognatha)
millipedes (class Diplopoda)
myriapods (subphylum Myriapoda)
arthropods (phylum Arthropoda)
animals (kingdom Animalia)

There are no other wild species of this genus in the bay area.

Subspecies can potentially be identified by range, but I don't know of any visual differences.

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• “The dark coloration with contrasting yellow-tipped keels warn of its ability to exude toxic hydrogen cyanide as a defense.” [source]
• smells like almonds
• glows under UV light

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Chris’s observations: 3 (all are research grade)

Locations:

• Nisene Marks SP
• Sam McDonald CP
• Sierra Azul OSP

Months:

• May: 2
• Jun.: 0
• Jul.: 1

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Taxon info: iNaturalist – BugGuide

Bay Area species: iNaturalist