Cluster Fly
( Pollenia rudis )


2010-0215-EB070001-DIP00496-Pollenia_rudis[1353h30s,F,A,oakleaf]{EXD}-G.jpg

PHOTO COMMENT
Cluster Flies are known for their habit of suddenly appearing in large masses in homes. Normally, these flies live harmlessly in the wild, where larvae are internal parasites of earthworms. However, in the fall adults seek out hollow trees or logs where they overwinter. In the absence of these structures the flies will colonize wall voids in homes or in other structures. Their sudden appearance happens when temperatures outdoors rise and the adults attempt to exit. These flies are thought to be the fly responsible for the plague of the home in the ?Amityville Horror? movie. Cluster Flies are hard to control because control would require the extermination of earthworms. Adult flies can be recognized by their coat of sparse golden hairs.

IDENTIFICATION
Identification:Pollenia rudis
(Fabricius, 1794)
Common Name:Cluster Fly
Life Stage:(A) adult

PHYLOGENY

Phylum:Arthropoda
Class:Insecta
Superorder:Holometabola
Order:Diptera
Family:Calliphoridae
Genus:Pollenia
Taxon Code:DIP00496
ITIS/TSN:151647

LOCATION DETAILS
Location Name
Briones Regional Park, Briones Regional Park, Briones Regional Park, Lafayette
County:Contra Costa County
ECI Site#:CAEB070000
Park/Forest Code:Briones Regional Park

RECOGNITION
Body Length
7-9 mm.

BIOLOGY

CREDITS
Photographer
Eddie Dunbar
Insect Sciences Museum of California

References
ITIS.


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