Chionea stoneana
Alexander, 1940
snow fly
Chionea stoneana is a wingless crane fly in the Limoniidae, commonly known as a 'snow fly.' are active during winter months and are frequently observed crawling on snow surfaces. The species occurs in the central United States, ranging from Minnesota and Indiana south to Kansas, Oklahoma, and Missouri. Like other members of its , it possesses physiological adaptations for cold , including glycerol in its body fluids that acts as an antifreeze.
Pronunciation
How to pronounce Chionea stoneana: /kaɪˈoʊniə stoʊˈniːə/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Habitat
Occupies the subnivean environment—microclimates beneath snow in cavities formed by arching grass blades, leaf litter, and small mammal tunnels. Also found in caves and concealed in leaf litter when snow is absent.
Distribution
Nearctic region: central United States, from Minnesota and Indiana south to Kansas, Oklahoma, and Missouri.
Seasonality
Active during winter months. Appears most commonly in October and November, and again in February and March.
Life Cycle
Larvae feed and grow during summer months; occurs in fall. females can produce up to 194 , laid singly. Eggs hatch in eight days to three weeks under laboratory conditions. Larval diet remains unknown; laboratory rearing attempts have failed due to lack of knowledge about larval food requirements.
Behavior
crawl on snow surfaces during winter. When not on snow, they remain concealed in insulated microhabitats beneath snow, in leaf litter, or in caves. Adults may live up to two months. Susceptible to overheating; cannot tolerate warm temperatures.
Ecological Role
Serves as prey for small mammals such as mice, and for rock-crawlers (Grylloblattidae) at high elevations. Acts as intermediate for parasitic tapeworms of rodents.
Human Relevance
Does not bite or sting humans. Occasionally observed by winter hikers and naturalists, generating curiosity due to unusual winter activity. No economic significance.
Similar Taxa
- Other Chionea speciesSixteen occur in North America; C. stoneana distinguished by central U.S. distribution pattern and subtle morphological features
- Winged crane flies (Tipulidae, other Limoniidae)All other crane flies possess functional wings; Chionea is uniquely wingless among Limoniidae
More Details
Cold tolerance mechanisms
Possesses glycerol in body fluids acting as antifreeze to prevent ice crystal formation. systems function at lower temperatures than most insects. Occupies subnivean microhabitats with milder temperatures than surface conditions.
Reproductive adaptation
Wingless females utilize the thoracic space normally occupied by muscles for storage, allowing production of up to 194 eggs.