Hoplitis biscutellae
(Cockerell, 1897)
Creosote Small-Mason
Hoplitis biscutellae is a solitary in the Megachilidae, first described by Cockerell in 1897. It is distributed across Central America and North America. Like other members of the Hoplitis, it is a cavity-nesting that constructs nests using mud or plant materials. The "Creosote Small-Mason" suggests an association with creosote bush (Larrea tridentata), though specific plant relationships remain poorly documented.
Pronunciation
How to pronounce Hoplitis biscutellae: /hɔˈpliːtɪs bɪskjuˈtɛliː/
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Identification
Hoplitis biscutellae can be distinguished from other Hoplitis by subtle morphological features of the scutellum and other thoracic structures referenced in its specific epithet. Accurate identification requires examination of male genitalia and other microscopic characters. It is smaller than most Osmia species and lacks the metallic coloration seen in some related mason bees. The "Creosote Small-Mason" distinguishes it from other Hoplitis species that may be associated with different plants or .
Habitat
Associated with creosote bush (Larrea tridentata) scrublands and desert environments based on its ; specific requirements are not well documented in published literature.
Distribution
Documented from Central America and North America. GBIF records indicate presence in Middle America and North America, with observations concentrated in the southwestern United States and adjacent regions of Mexico.
Host Associations
- Larrea tridentata - associated withInferred from "Creosote Small-Mason"; specific nature of association (pollen collection, nesting substrate, or other) is not documented in available sources.
Behavior
As a member of the Osmiini tribe, it exhibits solitary nesting typical of mason bees. Females construct individual nests in pre-existing cavities, using mud or chewed plant material to partition . Males lack stingers and may be observed patrolling nesting areas.
Ecological Role
Contributes to pollination of flowering plants within its range. As a solitary , it is likely an effective of native desert and scrubland flora, though specific plant interactions have not been quantified in published studies.
Similar Taxa
- Hoplitis albifronsOverlapping distribution in western North America; distinguished by differences in facial markings and scutellar .
- Osmia speciesSimilar size and nesting ; Hoplitis biscutellae is generally smaller and lacks the metallic blue or green coloration common in many Osmia.
- Hoplitis onosmaevaeBoth are specialized Hoplitis with narrow ; H. onosmaevae is distinguished by its disjunct Alpine/Middle Eastern distribution and presumed specialization on Onosma pollen.
More Details
Taxonomic History
Originally described as Alcidamea biscutellae by Cockerell in 1897, later transferred to the Hoplitis. The basionym reflects historical classification within a now-synonymized genus.
Data Availability
Despite 101 iNaturalist observations, published biological and ecological data for this remain sparse. Most available information consists of occurrence records and taxonomic classification rather than detailed natural history studies.