Hypochilus petrunkevitchi
Gertsch, 1958
lampshade spider
Hypochilus petrunkevitchi is a lampshade to the southern Sierra Nevada of California. It exhibits extreme intraspecific genetic divergence, with nuclear and mitochondrial lineages corresponding directly to drainage basins. show >15% CO1 divergence between river basins despite striking male morphological stasis. The is a textbook example of a short-range endemic with naturally limited ability.
Pronunciation
How to pronounce Hypochilus petrunkevitchi: /haɪpoʊˈkaɪləs ˌpɛtrʊŋkəˈvɪtʃi/
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Identification
Male shows striking stasis across despite deep genetic divergence; identification to level may require genetic analysis due to conserved morphology. Nuclear and mitochondrial lineages correspond directly to specific drainage basins, allowing geographic assignment of specimens.
Images
Habitat
Shaded, mesic rock outcrop in montane regions of the southern Sierra Nevada.
Distribution
Southern Sierra Nevada of California, restricted to six drainage basins: Merced River, San Joaquin River, River, Kaweah River, Tule River, and Cedar Creek drainages.
Behavior
Microhabitat with extraordinarily low vagility; limited between drainage basin .
Ecological Role
Textbook example of a short-range (SRE) with naturally small geographic distribution and high genetic structuring.
Human Relevance
concern due to microendemic distribution and specialization; threats from habitat alteration in restricted montane localities.
Similar Taxa
- Hypochilus bernardinoNested within H. petrunkevitchi phylogenetically and sister to southernmost basin ; previously recognized as distinct but now considered part of H. petrunkevitchi lineage
- Hypochilus xomoteNewly described from Tule River and Cedar Creek drainages; previously included within H. petrunkevitchi but separated based on combined nuclear, mitochondrial, geographical, and morphological evidence
More Details
Genetic structure
exhibit >15% CO1 mitochondrial divergence between drainage basins, with corresponding nuclear structuring. This extreme divergence without morphological differentiation represents a case of .
Phylogenetic position
Part of the California clade within Hypochilus; sister to the combined (California, Appalachia) clade relative to the southern Rocky Mountains clade.