|scientific name Taphrocerus schaefferi |
June, July and August.
Taphrocerus schaefferi and T. gracilis are very similar in appearance. Beetles of schaefferi have uniformly distributed pubescence and lack the clumps of white setae found on gracilis. I am unable to attribute any specimens examined from Alberta to this species. Those beetles that look like T. schaefferi appear to be worn beetles of T. gracilis with few if any white setae on the elytra. These "worn" beetles are often in series with more typical appearing beetles of T. gracilis. These specimens are listed under T. gracilis. From Downie and Arnett: length 3.5-4.0 mm, Depressed; aeneous; elytra punctate striate, punctures coarse, each with short reflexed setae; base of elytra with foveae, sides sinuate, widest at base, there sharply emarginate, broadening to center, then becoming narrow to base; pronotum widest at base, distinctly, transversely depressed at base and apex; carina inside basal angle, sarsely, unevely finely punctate, each puncture with reflexed white setae; venter and legs black with aeneous luster.
Overwintered adults first appear in May, feeding on the leaf margins of the host. From 2 to 6 eggs are laid along the mid rib of new emerging leaves. Larvae hatch out in about 16 days, and mine the leaves following along the veins for about 10 cm, then turns back and mines toward the egg placement, gradually enlarging the mine. The larva continues to mine, and again turn back. Second and third instar larvae feed in the central region of the mine, consuming most of the leaf tissue. Pupation occurs in the central portion of the mine, lasting about 12 days. Adults emerge in mid July through August, feed for a while, then they disperse to overwintering sites (Story et. al., 1979).
Not confirmed from Alberta.
Reported to feed on yellow nut sedge (Cyperus esculentus). This species of plant is not found in Alberta. Two other species in the same genus are known to occur in Alberta, C. squairousus from the Medicine Hat area and C. schweinitzii from near Lake Pakowki. Both plant species are rare in Alberta.
Reported sporadically from Alberta to Ontario in Canada, and south in the United States to Texas.
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