New York Natural Heritage Program
Common Sanddragon
Progomphus obscurus (Rambur, 1842)
Insects

Habitat [-]
Both lentic and lotic habitats are occupied in different parts of New York. On Long Island, the species is found exclusively at two Coastal Plain Ponds. One of them is a large, round, sandy kettle with a shallow shoreline. At this location there are extensive Phragmites beds along most of the shoreline, with sparse areas of native emergent vegetation and little or no floating vegetation. A sandy swimming beach is maintained on the west side, near where the dragonflies were observed. The other occupied pond is a small, shallow, sand-bottomed pond with shrubs, woods, sedges (Juncus) and Phragmites. On the upper Hudson and Schroon Rivers the species occupies an area of moderate flow, with sandbars and very few boulders. The larvae are burrowers in fine sand found primarily on shifting sandbars, and beaches (White et al., 2010).

Associated Ecological Communities [-]
  • Coastal plain pond
    The aquatic community of the permanently flooded portion of a coastal plain pond with seasonally, and annually fluctuating water levels. These are shallow, groundwater-fed ponds that occur in kettle-holes or shallow depressions in the outwash plains south of the terminal moraines of Long Island, and New England. A series of coastal plain ponds are often hydrologically connected, either by groundwater, or sometimes by surface flow in a small coastal plain stream.
  • Confined river
    The aquatic community of relatively large, fast flowing sections of streams with a moderate to gentle gradient.
  • Riverside sand/gravel bar
    A meadow community that occurs on sand and gravel bars deposited within, or adjacent to, a river channel. The community may be very sparsely vegetated, depending on the rates of deposition and erosion of the sand or gravel.

Associated Species [-]
  • Common Green Darner (Anax junius)
  • Comet Darner (Anax longipes)
  • Familiar Bluet (Enallagma civile)
  • Orange Bluet (Enallagma signatum)
  • Slender Bluet (Enallagma traviatum)
  • Lancet Clubtail (Gomphus exilis)
  • Rapids Clubtail (Gomphus quadricolor)
  • Extra-Striped Snaketail (Ophiogomphus anomalus)
  • Brook Snaketail (Ophiogomphus aspersus)
  • Riffle Snaketail (Ophiogomphus carolus)
  • Pygmy Snaketail (Ophiogomphus howei)
  • Maine Snaketail (Ophiogomphus mainensis)
  • Rusty Snaketail (Ophiogomphus rupinsulensis)