rodent bot fly

(Cuterebra spp.)

               
Overview

Cuterebra is a genus of large, parasitic flies. They occur throughout North America, Mexico, and Central America, and are also found in South America. There are 78 Cuterebra species worldwide, 26 species in North America north of Mexico, and at least 6 species in Minnesota. They attack rodents, rabbits, and hares. Females lay their eggs in burrows and on “runs”. The eggs hatch almost instantly when they sense a passing warm body and the larvae attach themselves to the body. The larvae bore under the skin and feed on the flesh of the host. They produce boil-like swellings. Several larva may inhabit a single host.

rodent bot fly (Cuterebra sp.)

  Photo by LMG
 

Larvae are very common but adults are rarely seen. Adults do not feed. They fly early in the day, and are usually found in the proximity of their hosts, often on hilltops.

Identification

Cuterebra are large, robust, hairy, bee-like flies. They are usually identified by the species in which the larva is found. Adults are up to 1316 (30 mm) in length. The antennae have three segments. On the second segment there is a longitudinal, line-like groove (suture). The mouth opening is very small. The exoskeletal plate between the abdomen and the thorax (scutellum) is very short. The area just behind the scutellum (postscutellum) is well developed. On the wing the terminal cell (R5) of the radial sector (Rs) is closed or narrowed toward the end (distally).

 
Identification

 

 
Distribution Distribution Map  

Sources: 7, 24, 27, 29, 30, 82.

 
Comments

 

 
Taxonomy

Order:

Diptera (gnats, mosquitoes, true flies)

 

Suborder:

Brachycera (circular-seamed flies, mouches muscoïdes, muscoid flies, short-horned flies)

 

Infraorder:

Muscomorpha

  No Rank:

Eremoneura

  No Rank:

Cyclorrhapha

 

Section:

Schizophora (muscoid flies)

 

Subsection:

Calyptratae (calyptrates)

 

Superfamily:

Oestroidea

 

Family:

Oestridae (bot and warble flies)

 

Subfamily:

Cuterebrinae (New World skin bot flies)

 

Genus:

Cuterebra (rodent and lagomorph bot flies)

 
Subordinate Taxa

lagomorph bot fly (Cuterebra buccata)

rabbit bot fly (Cuterebra buccata syn. C. angustifrons)

rodent bot fly (Cuterebra grisea)

rodent bot fly (Cuterebra sterilator)

squirrel bot fly (Cuterebra emasculator)

 
Synonyms

 

 
Common
Names

glire bot fly

rodent bot fly

 

 

 

 

 

 

Glossary

Scutellum

The exoskeletal plate covering the rearward (posterior) part of the middle segment of the thorax in some insects. In Coleoptera, Hemiptera, and Homoptera, the dorsal, often triangular plate behind the pronotum and between the bases of the front wings. In Diptera, the exoskeletal plate between the abdomen and the thorax.

 

 

 

       
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LaRae
       

Seen a mouse come out of my garage had my nephew get the bb gun to kill it.

He went to grab it and we thought it was a baby coming out of its genital area I had him pull it out because I was curious it didn't look like a baby. Googled it and this it what came up. It had a total of 3 of these things in there. The first one was the biggest. The one pictured was the medium sized one.   rodent bot fly (Cuterebra sp.)
       
LMG
       

The dust on it is from the bird seed container I used to save it from the lawn mower.

  rodent bot fly (Cuterebra sp.)   rodent bot fly (Cuterebra sp.)
       
  rodent bot fly (Cuterebra sp.)   rodent bot fly (Cuterebra sp.)
       
       
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Visitor Sightings
   
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Lauren
9/16/2020

Location: Red Wing, MN

My cat caught a mouse this morning, the larvae came out of the dead mouse.


LaRae
8/30/2020

Location: North St. Paul MN

Seen a mouse come out of my garage had my nephew get the bb gun to kill it. He went to grab it and we thought it was a baby coming out of its genital area I had him pull it out because I was curious it didn't look like a baby. Googled it and this it what came up. It had a total of 3 of these things in there. The first one was the biggest. The one pictured was the medium sized one.

rodent bot fly (Cuterebra sp.)


Tracy Heasley
7/30/2020

Location: Coon Rapids, MN

scooped it out of my swimming pool, still alive. Googled it, went back outside and killed it.


Sarah
7/14/2020

Location: White Bear Lake, Minnesota

Took my cat to the vet this morning. Doctor removed what he said was a bot fly larva.


LMG
6/22/2019

Location: Scott County

The dust on it is from the bird seed container I used to save it from the lawn mower.

rodent bot fly (Cuterebra sp.)


     
     
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Created: 6/25/2019

Last Updated:

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