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Aeshna sitchensis (Zigzag Darner)BC conservation rank: S5. Yellow List.Description: Small, similar to A. septentrionalis, but its thorax stripes are yellow to blue, and the hind one is more zigzagged and less T-shaped (fig. 7j); the facial T-spot has a crescent-shaped base (fig. 8a). Male's abdomen has large blue spots, though smaller than those of A. septentrionalis. The face is yellow to green. Female's abdominal spots are blue or yellow-green. Male's upper appendages simple (fig. 9a). Length: male 59 mm, female 56 mm. Global Range: Alaska east to Labrador and Newfoundland; south to Maine, Michigan, Minnesota, Montana, Wyoming, Utah and Washington (Needham et al. 2000). Faunal element: Widespread Boreal (see Appendix 2). Range: Widespread. Biology: Restricted to specific peatland conditions, where it can be abundant: bogs or fens where the surface is mossy and sparsely vegetated with short, evenly spaced sedges, and where open water, if present at all, is reduced to small, shallow, mud- or moss-bottomed ponds and puddles (07-08; Wb13, 50-52). Adults perch on the ground, rocks and logs, or vertically, low on tree trunks. BC flight period: mid June to early October; the majority of collections range from early July to mid August.
Aeshna sitchensis Map 3. Frequency of records in British Columbia by NTS 1/50,000 mapsheet. |
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