|Click to enlarge. [source]|
Since Euryopis formosa occurs from "Central California north to British Columbia and east to Wyoming" according to Levi (1954), these findings left me wondering whether E. formosa is associated with pines over its entire range, or whether the apparent association is only a Cascades phenomenon. To begin answering this question, I decided to do a back-of-the-envelope analysis by mapping E. formosa specimen locations reported in Levi (1954) and Bennett at al. (2014) along with those Rod Crawford and I reported on from Washington.
|Presence or absence of pine |
(Pinus) at E. formosa collection sites
It appears that the spider-pine relationship holds true in the core of E. formosa's range, but less reliably so on the edges. Of course, no firm conclusion can be drawn from this surface analysis. For that, one would need to get updated specimen data from relevant spider repositories and superimpose it on range maps of pines that drop open, intact cones. It would be a fair amount of work, but it looks like a worthwhile project.