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Somatochlora semicircularis (Mountain Emerald)BC conservation rank: S5. Yellow List.Description: The sides of the thorax are metallic green with two oval yellow spots, the larger in front. The abdomen sides sometimes have small, dull yellow spots on segments 5 to 8. Male's appendages, fig. 13f (the shape gives this species its scientific name, semicircularis). Female's vulvar lamina, fig. 14f. Length: male female 50 mm. Global range: Alaska east to Yukon, south through British Columbia and western Alberta to New Mexico and California (Needham et al. 2000). Faunal element: Cordilleran (see Appendix 2). S. semicircularis is the only species in the family belonging to the Cordilleran faunal element BC Distribution: Widespread; not known from lower elevations east of the Rocky Mountains. Biology: The most abundant Somatochlora in BC, much more common in the south than in the north. Thrives in marshes and peatlands in sedge-lined lakes and ponds (Wf01 is the classic site association; also Wf05-08, Wm01-02), especially where the plants are tall and dense; males patrol and hover over these sedge beds. BC flight period: late May to early October; most records are from early July through mid August.
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