Protodufourea zavortinki

Zavortink's Protodufourea Bee

Family: Halictidae · Class: Insecta · Order: Hymenoptera

Conservation status: G1 S1

Zavortink's Protodufourea Bee (Protodufourea zavortinki) is a solitary bee species endemic to California and recognized as one of the state's rarest native pollinators. This small bee belongs to the family Halictidae and represents part of California's highly specialized native bee fauna. Physical characteristics and detailed morphological descriptions for this species remain poorly documented in the scientific literature, reflecting the limited research attention given to many of California's endemic bee species. The species has an extremely restricted range within California, contributing to its Global and State conservation rank of G1 S1, indicating it is critically imperiled both globally and within the state. The precise geographic distribution of P. zavortinki has not been comprehensively mapped, though it appears to occur in very localized populations within specific habitat types. Like other members of the genus Protodufourea, this species likely has highly specialized habitat requirements that limit its distribution. Habitat preferences for Zavortink's Protodufourea Bee have not been well-documented in available scientific literature. Members of the genus Protodufourea are typically associated with specific plant communities and may require particular soil conditions for nesting. As a ground-nesting solitary bee, P. zavortinki likely constructs individual nest burrows in suitable substrate, though specific nesting requirements remain unstudied. The species' extreme rarity suggests it may be dependent on increasingly uncommon habitat conditions or plant associations. The behavioral ecology and life history of P. zavortinki remain largely unknown. As a member of the Halictidae family, it is presumed to be a solitary species where individual females construct and provision their own nests. Flight period, foraging preferences, and reproductive biology have not been documented. The genus Protodufourea includes species that are often oligolectic, meaning they specialize on pollen from a narrow range of plant species, but the specific host plant relationships for P. zavortinki have not been identified. Conservation status assessments indicate this species faces critical risk of extinction. With a G1 S1 ranking from NatureServe, Zavortink's Protodufourea Bee is classified among California's most imperiled native bee species (Xerces Society 2019). The species lacks federal protection but has been identified as a Species of Greatest Conservation Need. Primary threats likely include habitat loss, degradation of native plant communities, and the species' apparent narrow ecological requirements. Climate change may pose additional risks to remaining populations through altered precipitation patterns and temperature regimes that could affect both the bee and its presumed host plants. Scientific documentation for this species remains extremely limited. The information presented here synthesizes available data from conservation databases and regional assessments. Detailed ecological studies, population surveys, and habitat characterization are urgently needed to inform conservation strategies. We welcome contributions of verified scientific data, photographs, or field observations to enhance understanding of this critically rare California endemic.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, and more.