Gastrophysa cyanea    



habitat
May have similar habitats as G. polygoni and G.viridula which are often found in cultivated areas with homogenous plant communities (fields of hay or cereals, yards).

seasonality
Adults emerge in April (Lawson 1950) varying somewhat by region but being present at least until August (McCracken 1906, Strickland Collection).

identification
Larvae have few spines, their bodies change from yellow to black to green throughout their instar stages. A diagram from Lawson shows their bodies as being spotted. Their head capsules are dorso-ventrally flat and usually darker than their bodies (Lawson 1950). Two known colour morphs of adults exist, one metallic green and one black with a metallic blue sheen (McCracken 1906). No difference appears to exist between the two adult colour morphs (Lawson 1950), however all beetles start out as black, while those with a recessive gene later develop green colouration (McCracken 1906).They have fewer tiny depressions spread over the head and thorax compared to the elytra which are very punctate. They are 4-5 mm in length and are oblong oval in shape. Their sternites, antennae, and legs are purplish black (Blatchley 1910).

life history
Pupation occurs in the soil (Lawson 1950).They may be multivoltine, similar to G. viridula .

diet info
Herbivorous on Rheum rhabarbarum (rhubarb) and several species within the plant genus Rumex (dock) (Lawson 1950).

range
According to Lawson, these beetles are found throughout southern Canada and the United States (1950). The Strickland collection includes specimens collected in the Northwest Territories as well as the southern half of Alberta.

notes
The genus name refers to the abdomens of the females becoming relatively engorged when carrying fertilized eggs (Blatchley 1910 and Lesage and Majka 2009). The genus is also identified by their characteristically thin pleurites and their common shape and similar colouring (Blatchley 1910). The genus has been incorrectly referred to as Gastroidea and Gastreoidea in past literature (Lawson 1950 and Lesage and Majka 2009).

people
species page authorCarscallen, G.2013 

quick link
http://entomology.museums.ualberta.ca/searching_species_details.php?s=39125

 

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