Trachusa perdita

Cockerell, 1904

California leafcutting bee, California Resin-Leafcutter

Trachusa perdita is a solitary leafcutting native to California, belonging to the Megachilidae. Females construct underground nests in hillsides, lining with leaves collected from Buckthorn shrubs. The is notable for its distinctive nesting and specific -plant relationship for nest construction materials.

Trachusa perdita by (c) Pinnacles National Park, some rights reserved (CC BY), uploaded by Pinnacles National Park. Used under a CC-BY license.

Trachusa perdita 79242019 by Pinnacles National Park. Used under a CC BY 4.0 license.

Trachusa perdita 192255005 by Jacob Malcom. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Trachusa perdita: /ˈtræ.kjuː.sə pərˈdɪt.a/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other Megachilidae by the combination of abdominal scopa, dark grey coloration with white abdominal bands, and nesting involving leaf-lined underground burrows. The only other North American in Trachusa also occurs in California, but T. perdita is specifically associated with Buckthorn leaf use in nest construction. Distinguished from honey bees and bumble bees by solitary lifestyle and abdominal (rather than corbiculate) pollen carriage.

Images

Appearance

Dark grey body with white bands of hairs on the . Scopa (pollen-carrying structure) located on the surface of the abdomen rather than on the legs. Body length ranges from approximately 12–16 mm (one-half to three-eighths of an inch).

Habitat

Semiarid hillsides with shrubbery or tall grass growth. Nests constructed in sloped, well-drained soils allowing for excavation of diagonal tunnels.

Distribution

to California, North America. GBIF records indicate presence in North America and Middle America, though primary range is California.

Diet

feed on nectar. Larvae consume pollen and nectar provisions stored in .

Host Associations

Buckthorn Shrub - nest materialLeaves used exclusively to line

Life Cycle

Females excavate diagonal tunnels into hillsides, branching into individual . Each cell is lined with Buckthorn leaves, provisioned with nectar and pollen, and receives one . Larval development occurs within the sealed cell.

Behavior

Solitary nesting . Females independently construct and provision underground nests. No social colony structure observed.

Ecological Role

. Contributes to plant through nectar and pollen foraging. Specific ecological role in native California not quantified in available sources.

Human Relevance

Native of potential importance to California and agriculture, though specific crop pollination services not documented. Subject of conservation interest due to native decline trends.

Similar Taxa

Other Trachusa speciesOnly other North American Trachusa also occurs in California; differentiation requires examination of morphological details and nesting materials
Megachile leafcutter beesSimilar leaf-using nesting , but Megachile typically nest in pre-existing cavities rather than excavated underground burrows
Honey bees (Apis mellifera)Both are with abdominal pollen carriage, but honey bees are social, have corbiculae () on hind legs, and use wax rather than leaves for nest construction

More Details

Nesting specificity

Unusual among leafcutting bees for exclusive use of Buckthorn (Rhamnaceae) leaves in nest construction, indicating a specialized foraging relationship with this plant .

Conservation status

trends and specific threats not documented in available literature, though as a native California it may be affected by loss and climate factors affecting other native bees.