Fauna
Invertebrate

Pacific Sideband

Monadenia fidelis

Also known as Faithful Sideband, Pacific Sideband Snail

Pacific sidebands are among the largest native land snails in the Pacific Northwest, easily recognized by their smooth, glossy shells patterned with a bold dark equatorial stripe framed by lighter margins. While they often graze on the damp forest floor among sword ferns and rotting fallen trees, individuals routinely climb several meters up bigleaf maples and red alders to feed on epiphytic lichens and moisture-laden mosses. To survive dry summer spells and freezing winter weather, they seal their shell aperture with a protective parchment of dried mucus known as an epiphragm, aestivating in deep leaf litter or under downed wood.

MolluskForest DwellerNocturnal
—observations
—countries
—peak records
Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Diet & preyTree lichens, Wild fungi, Decaying leaves
Predators
  • Snail-eating ground beetles
  • Varied thrush
  • Pacific shrew
ThreatsDeforestation, high-intensity wildfires, and microclimate desiccation
HabitatsTemperate rainforests, moist mixed woodlands, and riparian corridors
Life span6–9 years
  1. OrderStylommatophora
  2. FamilyXanthonychidae
  3. GenusMonadenia
  4. SpeciesMonadenia fidelis
Range data is not available yet.
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Safe to observe at a normal distance.
Responsible observation
  • Footwear Awareness: Watch trail edges closely after autumn rains, when adults frequently crawl across exposed footpaths.
  • Handle With Care: Avoid pulling directly on the shell, as pulling can tear the mantle tissue free from the shell wall.
  • Preserve Moisture Refuges: Keep rotting nurse logs and damp leaf litter undisturbed to protect dormant individuals.
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