Cuterebra approximata

Walker, 1866

bot fly, rodent bot fly

Cuterebra approximata is a New World skin bot fly ( Oestridae) whose natural is the deer mouse (Peromyscus maniculatus). First instar larvae enter the host through the external auditory meatus and migrate to the body region, where they form subcutaneous warbles. Larvae develop through three instars from July through September before exiting to pupate in soil. are extremely short-lived, lacking functional mouthparts, and are active for approximately two weeks in late June to early July.

Pronunciation

How to pronounce Cuterebra approximata: /ˌkjuːtəˈrɛbrə ˌæpɹɔkˈsɪmətə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

of Cuterebra approximata have not been described in detail in available sources. The Cuterebra is characterized by large, robust flies resembling bumble bees, with adults of related showing distinctive red bands in the of rabbit-infesting species. Species-level identification requires examination by a ; the genus contains 34 recognized North American species with varying associations.

Habitat

Western Montana; subcutaneous tissues of rodent (specifically deer mice); soil for . are laid near host burrow entrances.

Distribution

Western Montana (documented from field studies). The Cuterebra is distributed across North America.

Seasonality

active for approximately two weeks in late June to early July. Larval development in occurs from July through September. Overwinters as pupae in soil.

Diet

Larvae feed on fluids within subcutaneous warbles; lack functional mouthparts and do not feed.

Host Associations

Peromyscus maniculatus - obligate Natural ; deer mouse. First instar larvae enter through external auditory meatus and migrate to body region.

Life Cycle

First instar larvae hatch from laid near burrow entrances, enter host through external auditory meatus, and migrate to body region. Larvae form subcutaneous warbles and develop through three instars from July through September. Upon completion of third instar, larva exits host, burrows into soil, and pupates. Bot flies overwinter as pupae. emerge, live approximately two weeks without feeding, and reproduce.

Behavior

First instar larvae exhibit directed from point of entry (external auditory meatus) to specific subcutaneous location on body. Larvae create warbles with respiratory opening to skin surface. are , short-lived, and focused exclusively on .

Ecological Role

of deer mice; subcutaneous larval development creates warbles. Relationship with appears relatively benign compared to less specialized ; some studies of related Cuterebra species suggest infected hosts may survive as long or longer than non-infected individuals, attributed to long evolutionary history between parasite and host.

Similar Taxa

Cuterebra fontinellaAlso parasitizes Peromyscus mice; distinguished by association patterns and geographic distribution
Cuterebra buccataRabbit-infesting with red bands; resemble bumble bees but associated with lagomorph rather than rodent
Cuterebra abdominalisRabbit-infesting ; distinguished by association and coloration
Dermatobia hominisHuman of Central and South America; broader range, uses phoretic mosquitoes to deliver , causes more negative host reactions due to less specialized host relationship