Rock-outcrop-specialist
Guides
Hypochilus petrunkevitchi
lampshade spider
Hypochilus petrunkevitchi is a lampshade spider endemic to the southern Sierra Nevada of California. It exhibits extreme intraspecific genetic divergence, with nuclear and mitochondrial lineages corresponding directly to drainage basins. Populations show >15% CO1 divergence between river basins despite striking male morphological stasis. The species is a textbook example of a short-range endemic with naturally limited dispersal ability.