Family: Emeralds (Corduliidae)
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Did you know?
Most species of Striped Emeralds, dragonflies of the genus Somatochlora, have a metallic green wax coating their thorax (Dunkle 2000). The females of our species of interest, the Mocha Emerald, are slightly larger than the males (Natural Heritage Endangered Species Program 2003).
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The Mocha Emerald is known to occur in eight counties in New York State, with no population estimates determined. Further survey efforts may result in the identification of additional populations or range expansions, and may enable population size estimations.
No estimate of population size for the Mocha Emerald has been made between the early-1990s to 2002 (New York Natural Heritage Program 2007). Information prior to this time frame is even more limited. New location information on the Mocha Emerald in New York may reflect heightened interest in surveying for this species rather than a population increase or a range expansion (Holst 2005).
While recent observations of Mocha Emeralds have been made from the early-1990s to 2002 in Westchester, Rockland, and Orange counties, they are known to occur in Cattaraugus, Dutchess, Erie, Oswego, and Tompkins counties, as well as New York City based on earlier observations (Donnelly 2004, New York Natural Heritage Program 2007). Since the full extent and size of the populations have not been determined, long-term trends are unclear.