Machimus polyphemi
Bullington & Beck, 1991
Gopher Tortoise Robber Fly
Machimus polyphemi is a robber fly described in 1991 that exhibits an obligate commensal relationship with gopher tortoise burrows. It is one of 12 known species that depend entirely on burrows excavated by Gopherus polyphemus. The species is essentially to longleaf pine , particularly sandhill , across the southeastern United States Coastal Plain.
Pronunciation
How to pronounce Machimus polyphemi: //ˈmækɪməs ˌpɒlɪˈfiːmaɪ//
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Identification
Can be distinguished from other Machimus by its exclusive association with gopher tortoise burrows; are flushed from resident burrows using a simple field method developed by researchers. Size data for adults have been recorded in recent studies.
Habitat
Longleaf pine (Pinus palustris) , specifically sandhill including disturbed sites. Occupies burrows excavated by gopher tortoises (Gopherus polyphemus) rather than constructing its own.
Distribution
Southeastern United States Coastal Plain. Documented at 43 sites across four states (Florida, Georgia, Alabama, South Carolina) from 2019–2025, with first records for Alabama and South Carolina established during this period. More widely distributed than previously recognized based on historic records and scientist observations.
Host Associations
- Gopherus polyphemus - obligate commensalInhabits burrows excavated by this tortoise ; one of 12 obligate commensals of gopher tortoise burrows. Not a of the tortoise itself.
Behavior
Remains within gopher tortoise burrows; can be flushed from resident burrows using a simple method involving disturbance or air flow into the burrow entrance.
Ecological Role
Obligate commensal member of the gopher tortoise burrow , one of 12 such documented. Represents a specialized component of longleaf pine sandhill biodiversity dependent on tortoise engineering.
Human Relevance
Subject of recent conservation interest due to its specialized requirements and dependence on gopher tortoise , which are themselves of conservation concern. Detected through scientist contributions on natural history platforms.
Similar Taxa
- Other Machimus speciesLack obligate association with gopher tortoise burrows; M. polyphemi is distinguished by this exclusive relationship rather than morphological features alone.
- Other Asilidae in longleaf pine ecosystemsDo not exhibit commensal in tortoise burrows; field detection via burrow-flushing method is specific to this ' use.
More Details
Conservation context
The ' dependence on gopher tortoise burrows and longleaf pine sandhill links its conservation status directly to these increasingly rare . Most documented sites occur in sandhill , including grossly disturbed examples, suggesting some of habitat alteration but not independence from the tortoise .
Research methods
A simple flushing method developed by researchers enables detection without destructive sampling of burrows, facilitating expanded distribution surveys from 2019–2025.