dog ticks

genus Dermacentor

Member of hardbacked ticks (family Ixodidae)
ticks (order Ixodida)
mites and ticks (subclass Acari)
arachnids (class Arachnida)
chelicerates (subphylum Chelicerata)
arthropods (phylum Arthropoda)
animals (kingdom Animalia)

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

pacific coast tick
Dermacentor occidentalis

pacific coast tick
Dermacentor occidentalis

basis capitulum [dorsal plate between head and body] longer than wide
cornua [just aft of basis capitulum] as long as or longer than wide
sizes of shield punctations not greatly disparate
pearl grey coloration of shield more extensive than brown

american dog tick
Dermacentor variabilis

1 observed taxon / 1 unobserved taxon / 1 key

Chris’s observations: 7 (5 are research grade)

Locations:

Henry Coe SP: 4
Coyote Hills RP
Monte Bello OSP
Russian Ridge OSP

Months:

Mar.: 1
Apr.: 3
May: 1
Jun.: 2

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Taxon info: iNaturalist – BugGuide

Bay Area species: iNaturalist