Family: Darners (Aeshnidae)
State Rarity Rank:
Global Rarity Rank:
Did you know?
The very constricted abdomen is due to the hourglass shape of the third abdominal segment that gives this species its name. The specific name, clepsydra, comes from the Greek word klepsydra meaning water clock or hourglass.
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To date, this species has been recorded from just ten localities in the state. The distribution of these records is widespread and the species principal habitat, small lakes and embayments on larger lakes with marshy or boggy edges (Dunkle 2000), is also widespread, but localized. These considerations suggest that existing collection locations are not an accurate representation of the actual number of populations. However, the species is thought to be fairly local in New York and other states so the number of undiscovered populations may not be large. It is likely that there are particular qualities, such as water depth, bottom substrate type, amount and type of aquatic vegetation, and pH, that make some lakes and ponds suitable while others are not.
There is no information on population trends for this species, although it seems likely that occupied sites are being lost due to changes in hydrology and water quality at some lakes and ponds across the species state range.
All but two of the locations where the species has been recorded are historical, but the historical locations have probably not been revisited. If the historical occurrences are no longer extant it would indicate a long-term decline.