Synonyms and other taxonomic changes
formerly considered a subspecies of C. repanda
Explanation of Names
Species name means "twelve-spotted" (1)
One of 84 Nearctic species in the genus.
The usual bands are often broken into spots - 12 spots on some individuals. On other individuals, the bands may be more intact and there will be fewer than 12 spots or marks. The shoulder marking (humeral lunule), whether entire or broken, is well-separated from the middle band or middle spots.
southern Canada and United States east of the Rockies but absent from Florida and the coastal southeast. Much the same range as C. repanda, and often found with it.
Margins of streams, rivers, ponds. Adults and larvae overwinter in burrows near the stream or pond margin.
Usually seen in spring (April-June) and again in late summer/early fall (August-October). In North Carolina, recorded April-May (June in mountains), August-October (2)
Two year life cycle, with third instar larvae passing through the first winter, and adults the second winter.
Hybridizes with C. oregona in a small area of the Rocky Mountains in midwestern US.
In the Common Shore Tiger Beetle
), the humeral lunule touches, or nearly touches, the anterior projection of the middle band (see image
by Patrick Coin).
Oregon Tiger Beetle
) is very similar but does not occur east of the Rocky Mountains.
Choate, plates 61, 62 lists, but there are no records for Florida (3)
Pearson, pp. 66-67, plate 4 (5)
Tiger Beetles of Connecticut
live adult image plus description, distribution, similar species (U. of Connecticut)
pinned adult image
plus description, habitat, seasonality, biology, distribution (Strickland Entomological Museum, U. of Alberta)