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Cordulia shurtleffii (American Emerald)BC conservation rank: S5. Yellow List.Description: The face is dark with brilliant green eyes. The thorax is metallic green-bronze and, unlike those of many Striped Emeralds, has no pale marks on the sides. The abdomen is black after segment 4 and the male's is widest at segment 8. Male's appendages are forked in views from below and the side, fig. 11a. Female's vulvar lamina, fig. 11b. Length: male 45mm, female 46mm. Global Range: Alaska east to Labrador and Newfoundland; south to Virginia, Michigan, Minnesota, Saskatchewan, and in the mountains to Colorado and California (Needham et al. 2000). Faunal element: Widespread Boreal (see Appendix 2). BC Distribution: Widespread. Biology: The most commonly seen emerald in our region. Flies early in the season, usually well before Somatochlora species appear, but both genera fly together later in the summer. Males patrol energetically and aggressively around forest lakes and peatland ponds, chasing off males of their own and other species. BC flight period: late April to early September; the majority of records are from late May to early August.
Cordulia shurtleffii Map 3. Frequency of records in British Columbia by NTS 1/50,000 mapsheet. |
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