Rhizophagus pseudobrunneus    

Under the bark of coniferous trees (Bousquet, 1990).

Likely similar to related species found in Alberta - May through September.

All Rhizophagus spp. have antennal grooves on either side and slightly under the head (Bousquet, 2004). Body is fairly flattened, elongate and small, under 4.5 mm in total length (Bousquet, 2004). The final abdominal tergite (the last segment visible dorsally) is not covered by elytra (Sengupta, 1988). Larvae may be 2-6 mm in length and flat or cylindrical or tapered at both ends (Lawrence, 1991). This species is similar to R. brunneus but does not have the small lip on the sides nor the slightly convex centre of the pronotum, the section of dorsal exoskeleton directly behind the head (Bousquet, 1990). The midline of the pronotum also lacks the finely textured exoskeleton and the distinct divets that are present along the sides (Bousquet, 1990).

life history
May be similar to R. brunneus.

Not known to be rare in North America.

diet info
Rhizophagus pseudobrunneus have been found underneath the bark of lodgepole pine (Pinus contorta) and ponderosa pine (Pinus ponderosa) (Bousquet, 1990). Based on data from other Rhizophagus species, most likely this taxon is predaceous on bark beetle larvae. Larvae of most Rhizophagus species feed on decaying cambium (Hinds, 1972; Lawrence, 1991) but may feed on other bark beetle larvae as well (Lawrence 1991).

This species has been collected along the Pacific coast of Alaska and British Columbia, and through the Rocky Mountain region to southern Alberta. It is also present south to Arizona and New Mexico (Bousquet, 1990).

Adults of Rhizophagus pseudobrunneus were included in R. brunneus before the new species was described in 1990 by Bousquet.

species page authorElliott, C.2005 

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