Enallagma annexum (Northern
Bluet)
(Formerly Enallagma cyathigerum (name now restricted to Old
World populations) BC conservation rank: S5. Yellow List
Description: Male's appendages, fig. 4g. The rear half of female's
segment 8 is usually black on top, the pointed end dividing a pale area at the
base. Length: male 33 mm, female 32 mm.
Global Range: Alaska east
to Newfoundland; south to Virginia, Iowa, Nebraska, New Mexico and Baja
California (Westfall and May 1996). Faunal element: Widespread Boreal (see
Appendix 2).
BC Distribution:
Widespread throughout.
Biology: The most common damselfly in
southern BC. Lives mostly along the marshy shores of ponds and lakes (Wm01-02,
Wm04-07, Wf01); usually avoids acidic and saline waters, but can occur there.
In BC, adults usually emerge a week or two after those of its close relative,
E. boreale.
BC flight
period: early May to late October; most records are from mid May to mid
August.
Figure 5. Enallagma annexum female's abdomen
tip (side view).
A8 = abdominal segment 8; OV = ovipositor; VS = vulvar
spine.
Enallagma
annexum mating. Photograph: George Doerksen, RBCM
Enallagma annexum (=
cyathigerum) Map 1. Geographical distribution and seasonal abundance of
records in British Columbia.
Enallagma annexum (=
cyathigerum) Map 2. Geographical distribution of records in British
Columbia before and after organized surveys began in 1996.
Enallagma
annexum (= cyathigerum) Map 3. Frequency of records in British Columbia by
NTS 1/50,000 mapsheet.
Enallagma
annexum (= cyathigerum) Map 4. Frequency of collection localities in
British Columbia by NTS 1/50,000 mapsheet. |
