Sonoran Desert Naturalist >>> Field Guide >>> Coleoptera - Beetles >>> Canyon Ragweed Leaf Miner

Hispine Leaf Beetle

Microrhopala rubrolineata

 

Photo © by Mike Plagens

This beetle was photographed while resing on a leaf of Brittlebush (Encelia farinosa), but many Canyon Ragweed (Ambrosia ambrosioides) were nearby and also had Microrhopala present. Location was First Water Trail in the Superstition Mountain Wilderness, Arizona on 3 May 2009.

Chrysomelidae -- Leaf Beetle Family

Some nine species of these shiny, flattened leaf beetles in the genus Microrhopala are found in North America and most are apparently associated with various Asteraceae. The common species in the Sonoran Desert are shiny black and marked with red. They are quite small, barely 3mm in length; this small size and the flattened profile are related to larval stage which is spent tunneling within a leaf between the tough, upper and lower epidermis.

At Mesquite Wash, Maricopa Co., Arizona on 01 Aug. 2009 I found this same species feeding in the midribs of new foliage on Cocklebur (Xanthium strumarium) and Camphor Weed (Heterotheca subaxillaris).

Leaf miners tend to occur on plants with thick, somewhat succulent leaves. Some Sonoran Desert plants are adapted to drought conditions by virtue of such thickened leaves that store water through drought periods. Monoxia is another leaf-mining beetle found in the Sonoran Desert.

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Copyright Michael J. Plagens, 1999-2008