common pill woodlouse

Armadillidium vulgare

Member of pillbugs (genus Armadillidium)
pill woodlice (family Armadillidiidae)
isopods (order Isopoda)
malacostracans (class Malacostraca)
typical crustaceans (superclass Multicrustacea)
crustaceans (subphylum Crustacea)
arthropods (phylum Arthropoda)
animals (kingdom Animalia)

Caution: There may be other wild species of this genus not yet included in this guide.

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Pill bugs protect their eggs and hatchlings under their semi-transparent belly plates. [source]

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Chris’s observations: 5 (all are research grade)

Locations:

• Coyote Hills RP
• Coyote Valley OSP
• Henry Coe SP
• Monte Bello OSP
• Sweeney Ridge National Recreation Area

Months:

• Mar.: 2
• Apr.: 1
• May: 1
• Jun.: 1

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Taxon info: iNaturalist – BugGuide

Bay Area species: iNaturalist