Leioproctus filamentosus

Leioproctus filamentosus is a species of solitary bee belonging to the family Colletidae, a group commonly known as plasterer or cellophane bees due to the smooth, cellophane-like lining they secrete inside their nest cells. Like other members of this genus, it is a ground-nesting bee, excavating burrows in soil rather than forming hives, and provisions its nests individually rather than living in colonies. Adults forage on native flowering plants, playing a role in pollination within their forest habitat, contributing to the reproductive success of understory and canopy flora in the ecosystems it occupies.

The species is found in Australia, where it is restricted to forest habitats. Its distribution appears limited, and it depends on the structural and floral characteristics of intact forest environments for nesting sites and forage resources.

Leioproctus filamentosus is classified as Vulnerable, with a decreasing population trend. Two ongoing threats have been identified as key drivers of this decline. Roads and railroads fragment and degrade forest habitat, disrupting nesting sites and floral resources while creating barriers to movement between populations.

Fire and fire suppression regimes also pose a significant risk, altering the structure and composition of forest vegetation that the species relies on for food and nesting substrate, with both uncontrolled wildfire and changes to historical fire patterns capable of reducing habitat suitability.

Specific conservation measures targeting this species have not been widely documented, though its listing under IUCN assessment criteria highlights the need for habitat protection within its Australian range, particularly safeguarding remaining forest tracts from infrastructure development and managing fire regimes appropriately.

Given ongoing habitat pressures and its restricted range, the species' outlook remains uncertain, with continued population decline expected unless threats to forest habitat integrity are mitigated.