Cuterebra lepusculi

Adults can be distinguished from other Cuterebra species by association with cottontail rabbit hosts and the characteristic red eye bands shared among rabbit-infesting species in the genus. The seven rabbit-infesting Cuterebra species (including C. lepusculi, C. abdominalis, and C. buccata) form a distinct group. Specific identification requires expert examination; C. lepusculi was described from Idaho and is associated with cottontail rabbits in that region.

Associated with cottontail rabbit habitats, including open sandy ground, glade edges, and areas near rabbit burrow entrances. Adults are rarely encountered in the field.

Idaho (type locality and documented study location); distribution presumably follows that of cottontail rabbit hosts (Sylvilagus spp.) in western North America, though specific range boundaries are not well documented.

Adults have been observed in April and May in Missouri and southeastern Missouri regions for related rabbit bot fly species; specific seasonal activity for C. lepusculi in Idaho has not been explicitly documented. Larvae spend approximately one month in the host. Adults overwinter as pupae.

Larvae feed on host fluids within subcutaneous warbles; they do not consume tissue directly. Adults do not feed.

• Sylvilagus spp. - obligate parasitecottontail rabbits; larvae develop in subcutaneous warbles

Females deposit eggs near host burrow entrances. Eggs hatch upon detecting host body heat. First instar larvae enter the host through natural orifices or wounds, migrate to subcutaneous locations, and form warbles. Second and third instars develop within the warble over approximately one month, feeding on host fluids. Mature third instar larvae exit the host, drop to the ground, burrow into soil, and pupate. Adults emerge from puparia; they are short-lived and focus solely on reproduction.

Adults are rarely encountered, suggesting secretive or low-activity behavior. They exhibit bumble bee mimicry, which may provide protection from predators. Females oviposit in host habitat rather than directly on the host.

Acts as an ectoparasite of cottontail rabbits. The relationship appears relatively benign compared to more generalist bot fly species; some studies of related Cuterebra species suggest infected hosts may survive as long as or longer than non-infected individuals, attributed to long coevolutionary history between parasite and host.

No direct human parasitism documented. Not a threat to humans handling infected rabbits; larvae cannot infect through casual contact with host skin.

• Cuterebra buccataAlso a rabbit bot fly with red eye bands; C. lepusculi distinguished by geographic association (Idaho/western US) and specific host relationships
• Cuterebra abdominalisAnother rabbit-infesting species with similar bumble bee mimicry and red eye bands; adults observed in Missouri and eastern US
• Cuterebra fontinellaParasitizes rodents (white-footed mice) rather than rabbits; differs in host specificity
• Dermatobia hominisHuman bot fly of Central and South America; uses phoretic mosquitoes to deliver eggs, has broad host range, and causes more severe host reactions due to less specialized relationship

• parasite
• myiasis
• rabbit parasite
• bot fly
• Diptera
• Oestridae
• Cuterebrinae
• Sylvilagus
• Idaho

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Oestridae | Beetles In The Bush
• Newly emerged rabbit bot fly | Beetles In The Bush
• BIOLOGY OF CUTEREBRA LEPUSCULI TOWNSEND (DIPTERA: CUTEREBRIDAE) IN COTTONTAIL RABBITS IN IDAHO