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Cordulegaster diastatops
Delta-spotted Spiketail

(Selys, 1854)
Cordulegastridae, Spiketail Family
"Most Wanted" Species
photo of Male delta-spotted spiketail
Male delta-spotted spiketail — Dan Jackson
Status-Global/State:
Global: G5 Wisconsin: S1
Distinguishing Characteristics:
This large, black-bodied dragonfly varies from 2.3 to 2.6 inches in length. Along the black abdomen, there are pairs of long pointed triangular yellow spots. The thorax usually have 3 lateral yellow stripes with the posterior widest stripe and middle narrowest stripe. The forehead is yellow with sea-green eyes. The male's abdomen is slightly clubbed while the female ovipositor (appendages at end of the abdomen) extends length of a segment beyond abdomen. The female is similar with one exception, the yellow on sides of the abdomen forms almost a continuous stripe.
Description of Habitat/Range:
Ranging throughout northeastern United States and southeastern Canada, the delta-spotted spiketail can be found at sunny seepages and small streams, usually spring runs, including boggy ones. In Wisconsin, it is at the western limit of its range.
Flight Season:
The flight season in Wisconsin is not well known, as only a few adults have been documented at one site, in Marinette County, in late June and early July. Throughout its range, the flight season is from mid-May to late August.
(Click on photos to enlarge)
photo of Male delta-spotted spiketail
Male delta-spotted spiketail — Dan Jackson
photo of Male delta-spotted spiketail
Male delta-spotted spiketail — Dan Jackson
photo of Close-up of male delta-spotted spiketail thorax
Close-up of male delta-spotted spiketail thorax — Dan Jackson
photo of Close-up of male delta-spotted spiketail face
Close-up of male delta-spotted spiketail face — Dan Jackson
photo of Side (top image) and top view of cercus for male delta-spotted spiketail
Side (top image) and top view of cercus for male delta-spotted spiketail — Dan Jackson
photo of Female delta-spotted spiketail
Female delta-spotted spiketail — Dan Jackson
photo of Ovipositing female delta-spotted spiketail
Ovipositing female delta-spotted spiketail — Dan Jackson
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