Comprehensive Description

Read full entry

General Description

The Western Spring Azure lacks any trace of orange markings on the underside, and has a white-grey underside with black median and marginal dots. Very similar to the Boreal Spring Azure (C. ladon lucia), but in Alberta these two occur together only in the Castle River - Waterton Lakes region. The underside ground colour of nigrescens is lighter than lucia, and the upperside of males is violet-blue, not pale powder-blue as in lucia. Individuals of both species occasionally occur that have coalescent hindwing spots, resulting in a large blotch rather than a number of dots. The taxonomy of this group of species has been very confusing, and research is still ongoing to define the number of species and the appropriate names for this genus in North America; nigrescens and lucia do not intergrade but remain distinct where they occur together in BC and Alberta (Bird et al. 1995, Guppy & Shepard 2001, Schmidt unpubl. data), evidence that they are separate species rather than geographic forms of the same species. 


Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© University of Alberta Museums

Source: University of Alberta Museums

Belongs to 0 communities

This taxon hasn't been featured in any communities yet.

Learn more about Communities


EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!