Nest in holes in wood blocks or pithy stems. Cell partitions and caps are made of leaf pulp (Cane et al. 2007).
Global Range: (200,000-2,500,000 square km (about 80,000-1,000,000 square miles)) This is a species of relatively arid parts of the southwestern USA extending into northern Baja California Norte and east as far as Cimarron (1999) and Harper (1998) Counties in Oklahoma, Culberson in Texas (1986), and north into extreme southern Idaho (Oneida County, 1972), Wyoming (Fremont Co.,1998), and northern Nevada (Washoe in 1997). It occurs widely in Utah and the southern half of California. Scott et al. (2011) list 11 counties for Colorado, including four of the eight that border Utah and two that border New Mexico. Discover Life gives data for only four of these including Archuleta in 2000 and Douglas in 2000. Rightmyer and Griswold (2010) do list this species for southeastern Arizona and Discover Life maps 1960, 1987, and 1988 records form two counties.
Regularity: Regularly occurring
Type of Residency: Year-round
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 21 to >300
Comments: About 50 collection sites mapped by Dsicover Life, most since the 1980s
Molecular Biology and Genetics
Statistics of barcoding coverage: Osmia gaudiosa
Public Records: 0
Specimens with Barcodes: 4
Species With Barcodes: 1
NatureServe Conservation Status
Rounded Global Status Rank: G4 - Apparently Secure
Reasons: A high proportion of records for this species are in the 1990s and 2000s, several more are in the 1980s. This species has been collected from 1996 to 2011 in most of its range. There are certainly dozens, perhaps hundreds, of occurrences and no indication of decline.
National NatureServe Conservation Status
Rounded National Status Rank: NNR - Unranked
Global Short Term Trend: Relatively stable (=10% change)
Global Long Term Trend: Relatively stable (=10% change)
Comments: This species could be under-collected because of its apparently rather arid, low, habitats. Records do suggest it is somewhat uncommon but there are 1996 to 2011 records from most of the range, and since 1986 in all of the US portion. In much of the range most or all records are since the 1980s. Lack of post-1980s records in Mexico may be due mostly to difficulty of collecting there after about 1990.
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