Within the genus Capnia, the Capnia californica species group is demonstrated to be monophyletic and limited in zoogeographic distribution to western North America. A new species, Capnia kersti, is described. It is remarkable in coming from central Oregon, well north of the known range of all other closely related members of the group. Characteristics for diagnosing the new species from all others in the genus are given. A revised key to the C. californica group, key illustrations, and distribution maps for all species in the group are given. Fully resolved phylogenies of the group based on a matrix of morphological characters are given. The distribution of characters on the most parsimonious tree is discussed. Two types of distribution for members of the group are summarized, one along the coast of western North America and a second that is expanded to include the desert southwest. A large gap between closely related forms is noted in the region of the current Mohave Desert. This gap correlates to a date of between 8 and 15 ka (ka is 1,000 yr before present) for the desertification of this area.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 97 • No. 1