California-floristic-province
Guides
Calathus ruficollis ignicollis
Calathus ruficollis ignicollis is a flightless ground beetle subspecies endemic to the Transverse Ranges of southern California. First described by Casey in 1920, it represents the southern Sierra Nevada population of the broader C. ruficollis complex. Phylogeographic studies indicate this subspecies is genetically distinct from populations south and west, corresponding to a deep mitochondrial split within the species. Despite being flightless, the species shows limited geographic structure, suggesting recent range expansion or gene flow across mountain barriers.
Euctenizidae
Wafer-lid Trapdoor Spiders
Euctenizidae is a family of mygalomorph spiders elevated from subfamily status in 2012. The family contains approximately 79 described species across eight genera, including Aptostichus, Myrmekiaphila, and Promyrmekiaphila. Members are characterized by their fossorial lifestyle and construction of silk-lined burrows with distinctive trapdoors. The family is now considered more closely related to Idiopidae than to other trapdoor spider families.
Phidippus adumbratus
California Red Jumping Spider
Phidippus adumbratus is a jumping spider in the family Salticidae, commonly known as the California Red Jumping Spider. It belongs to the insignarius species group within the genus Phidippus. The species was first described by Gertsch in 1934 from a type specimen collected in Los Angeles. Its specific epithet derives from Latin adumbratus, meaning 'secret' or 'in the dark,' possibly alluding to the missing abdomen of the holotype specimen.