Apomastus kristenae

Males are distinguishable from Apomastus schlingeri by morphological characters; females cannot be reliably separated morphologically and require molecular analysis or geographic provenance for identification. The species was originally described using combined morphological and molecular data (mitochondrial COI sequences) due to this diagnostic limitation.

Occupies the Los Angeles Basin, San Juan Mountains, and San Joaquin Hills regions. The habitat is described as fragile and rapidly succumbing to urban encroachment.

United States: southern California, specifically the Los Angeles Basin, San Juan Mountains, and San Joaquin Hills.

Constructs wafer-lid trapdoor burrows, a characteristic of the family Euctenizidae.

Conservation concern due to habitat loss from urban development in the Los Angeles region. The species' restricted range and substantive intraspecific divergence documented in molecular data highlight vulnerability to local extinction.

• Apomastus schlingeriFemales are morphologically indistinguishable; distinguished by male morphology and geographic distribution (A. schlingeri is the type species with overlapping range in southern California). Both species were historically confused prior to molecular systematic work.

• trapdoor spider
• mygalomorph
• endemic
• California
• urbanization threat
• molecular taxonomy

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Systematics of the Californian euctenizine spider genus Apomastus (Araneae : Mygalomorphae : Cyrtaucheniidae): the relationship between molecular and morphological taxonomy