About American Grannom
A case-building caddisfly whose larvae attach their cases to rocks in fast current and filter-feed. Cases are chimney-shaped and built from silk and plant fragments.
Did You Know?
Larvae can switch between filter-feeding and scraping algae depending on current speed.
How to Identify American Grannom
American Grannom (Brachycentrus americanus) belongs to the order Trichoptera, family Brachycentridae. Adults typically measure 9-13 mm.
American Grannom Habitat
American Grannom is found in rivers & streams habitats, particularly across North America. This species has adapted to thrive in its preferred environment, where it can find suitable food sources and shelter.
American Grannom Diet and Feeding
American Grannom has an omnivorous diet, feeding on both plant and animal matter. This dietary flexibility allows it to exploit a wide range of food sources in its environment.
Where Is American Grannom Found?
American Grannom can be found in North America, where it inhabits rivers & streams environments. Its distribution is influenced by climate, food availability, and habitat suitability.
Distribution Map
Where American Grannom can be found
Is American Grannom Dangerous?
American Grannom is generally harmless to humans. It does not bite or sting and poses no significant health risk. Like most insects, it prefers to avoid human contact and will typically flee rather than confront a perceived threat.
American Grannom Role in Nature
American Grannom plays a role in its ecosystem as part of the food web, serving as both consumer and prey. Insects like American Grannom are a vital food source for birds, bats, and other wildlife, and contribute to the overall health and balance of their environment.
Seasonal Activity
Frequently Asked Questions About American Grannom
What does American Grannom look like?
The American Grannom typically measures 9-13 mm.
Where is American Grannom found?
The American Grannom is found in North America and typically inhabits rivers & streams environments.
What does American Grannom eat?
The American Grannom has an omnivorous diet, feeding on both plant and animal matter.
Is American Grannom dangerous to humans?
The American Grannom is generally harmless to humans. It does not bite or sting and poses no significant health risk.
What is an interesting fact about American Grannom?
Larvae can switch between filter-feeding and scraping algae depending on current speed.
Cite This Page
APA:
InsectDiscover. (2026). American Grannom (Brachycentrus americanus). Retrieved from https://insectdiscover.com/insect/american-grannom
MLA:
"American Grannom." InsectDiscover, https://insectdiscover.com/insect/american-grannom.