|
| |||||
|
|
Aeshna tuberculifera (Black-tipped Darner)BC conservation rank: S4. Yellow List. Northern surveys added greatly to the number of records of this uncommon species; the rank has been down-listed from S2S3 in 1995 to S3 in 2000 to S4 at present.Description: Large and slender. Thorax stripes are green to blue; shape, fig. 7a. Its face is green, the face line thin and pale brown or absent. Segment 10 of the abdomen is all black, as the English name indicates. Female's abdomen has blue spots, like the male's. Male's upper appendages simple (fig. 9a) with a tubercle underneath near the base; female's appendages are large. Length: male 73 mm, female 75 mm. Global Range: British Columbia east to Nova Scotia; south to Virginia, Ohio, Iowa, Montana and Washington (Catling et al. 2005, Needham et al. 2000). Faunal element: Transition (see Appendix 2). BC Distribution: Sparsely distributed across the moister regions of southern and central BC. north to Williston Lake. Biology: An uncommon dragonfly of peatland pools and peat-margined lakes (Wf05-08; Wb13, Wb50). Unlike most mosaic darners, females patrol like males and often lay eggs in vegetation above the waterline. Presumably, this behaviour reduces the amount of attention that males give them, allowing more time for uninterrupted egg-laying. BC flight period: mid June to early October; most records are from mid July to mid August.
Aeshna tuberculifera Map 3. Frequency of records in British Columbia by NTS 1/50,000 mapsheet. |
Previous Table of Contents Next
 |
||
 |
Copyright © Royal
BC Museum |
|
