Trinity bristle snail
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informal group Sigmurethra
Monadenia infumata setosa
The Trinity bristle snail attains a body length of approximately 2.5 cm. It is brown or chestnut-colored and covered with minuscule, translucent bristles, which give the species its common name.
Distribution and habitat
This species is endemic to California. This snail is found only in isolated locales along the Trinity River and nearby small creeks. It can only survive in cool, wet, shady riparian zones, and prefers areas with a deciduous understory.
The Trinity bristle snail is dependent on cool, moist conditions, and therefore it is only active at night. It spends warmer parts of the day stuck to shady areas on tree trunks, and in especially warm parts of the summer it may not move for days. When conditions are cool enough it feeds on lichen and the tender parts of green plants. The snail has a lifespan of over ten years, and may not reach full size for nearly that long. It is subject to predation by beetles and possibly rodents.
The species appears dependent on moist riparian habitats, and likely to respond poorly to clearing of understory growth. Human encroachment, mining, and damming, have reduced the snail's habitat significantly.
- Roth, B. (1996). "Monadesia setosa". IUCN Red List of Threatened Species. Version 2015.3. International Union for Conservation of Nature. Retrieved 26 September 2015.
- "Monadenia infumata setosa". NatureServe Explorer.
- Roth, B.; Pressley, P. H. (1986). "Observations on the range and natural history of Monadenia setosa (Gastropoda: Pulmonata) in the Klamath Mountains, California, and the taxonomy of some related species" (PDF). Veliger. 29 (2): 169–182.