Protodufourea wasbaueri

Wasbauer's Protodufourea Bee

Family: Halictidae · Class: Insecta · Order: Hymenoptera

Conservation status: G1 S1

Protodufourea wasbaueri, commonly known as Wasbauer's protodufourea bee, is a solitary bee species first described by Timberlake in 1955. This small native bee belongs to the family Halictidae and represents one of California's most critically imperiled pollinator species. As a member of the genus Protodufourea, this bee shares morphological characteristics typical of small halictid bees, including a compact body structure and metallic coloration, though specific morphometric data for this species remains limited in published literature. Wasbauer's protodufourea bee is endemic to California, where it maintains an extremely restricted distribution. The species' range and specific locality information have not been extensively documented in accessible scientific literature, contributing to uncertainty about its precise geographic limits. Given its G1 S1 conservation ranking, the species likely occupies a very small area within the state, possibly limited to specific habitat types or microclimatic conditions that support its survival. Habitat requirements for P. wasbaueri remain poorly documented in published sources. Like other members of the genus Protodufourea, this species likely requires specific soil conditions for nest construction, as most halictid bees are ground-nesting species that excavate burrows in suitable substrate. The bee probably depends on particular plant communities for foraging resources, though specific host plant relationships have not been well established in available literature. The species' extremely limited distribution suggests highly specialized habitat requirements that may include specific soil types, elevation ranges, or plant associations. Ecological information about Wasbauer's protodufourea bee is scarce in scientific literature. As a solitary bee, females likely construct individual nests and provision cells with pollen and nectar for their offspring. The species' flight period, nesting behavior, and preferred foraging plants remain largely undocumented. Like other small halictid bees, P. wasbaueri probably has a relatively short active season coinciding with the bloom period of its host plants. The species' role as a pollinator within its ecosystem is presumed but not quantified in available studies. Protodufourea wasbaueri faces critical conservation challenges, as indicated by its G1 S1 ranking from NatureServe, signifying that the species is critically imperiled both globally and within California (NatureServe 2022). The species appears on pollinator conservation priority lists, highlighting its vulnerable status among western rangeland pollinators (Xerces Society 2019). Primary threats likely include habitat loss, fragmentation, and degradation of specialized habitat requirements. The species' extremely narrow distribution makes it particularly vulnerable to localized disturbances, climate change, and land use modifications. Current population estimates and trend data are not available in published sources. The paucity of detailed scientific information about this species underscores the need for targeted research to better understand its distribution, habitat requirements, and conservation needs. Enhanced survey efforts and ecological studies would provide critical data for developing effective conservation strategies for this rare California endemic bee.

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