Regularity: Regularly occurring
Type of Residency: Year-round
Global Range: (>2,500,000 square km (greater than 1,000,000 square miles)) The native range is apparently most of Europe and the North African coast east to about India. Mitchell (1962) states Minnesota to Nova Scotia, south to Illinois and North Carolina and does not indicate that this species is introduced in North America. The Discover Life website's map also indicates Georgia, South Carolina, Nebraska, and Newfoundland with no locality information given, as well as mostly recent records from southern British Columbia to Corvallis, Oregon and Idaho (no locality given), which are presumably from introduced populations before 1962. The BugGuide.net website unequivocally states that the species is recently introduced from the Palearctic. However, many records upon which the Discover Life map is based are from specimens collected between 1935 and 1945, and a few earlier, plus it was already widespread in Mitchell's time. This bee has also been introduced to New Zealand.
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: > 300
Comments: Assumed to still be widespread in its native range, and it probably still is in North America.
Molecular Biology and Genetics
Barcode data: Osmia caerulescens
There are 3 barcode sequences available from BOLD and GenBank. Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species. See the BOLD taxonomy browser for more complete information about this specimen and other sequences.
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Download FASTA File
Statistics of barcoding coverage: Osmia caerulescens
Public Records: 3
Specimens with Barcodes: 16
Species With Barcodes: 1
National NatureServe Conservation Status
Rounded National Status Rank: NNR - Unranked
NatureServe Conservation Status
Rounded Global Status Rank: G5 - Secure
Reasons: Apparently this is still a widespread and adaptable bee in the Palearctic, at least in Europe and the Middle East. It appears to be declining in eastern North America, where is was apparently introduced before the 1930s, but is probably expanding on the West Coast, where it was introduced much later. Also established in New Zealand. The species appears to be a G5, although information from its native range was not evaluated in detail. This species is not of conservation concern in North America because it is not native.
Other Considerations: Reported from Maine but not by Adamson (2011) from Virginia or Tuell et al.. (2009) for Michigan. Probably still expanding its range in North America.
Global Short Term Trend: Unknown
Global Long Term Trend: Unknown
Comments: Information from the Europe etc. was not evaluated in any detail. The species appears to have declined in eastern North America, but it apparently is not native there. Discover Life account includes a comment that this species is associated with urban areas but that it has declined or disappeared from southern portions of its North American range. All but two of about 25 eastern localities on the range map from the Virginias northward that were checked are based on pre-1950 specimens or (about half) no details were given. Post 2000 records included Nova Scotia and West Virginia. This is an unusually low proportion of modern records. On the other hand it now has a significant range along the west coast with four dates from 1962 to 2003 in Washington and Oregon.
Comments: No information on threats from native range was evaluated.
Names and Taxonomy
Comments: Osmia caerulescens, not "coerulescens" is the correct spelling (Jordi Bosch, pers. comm., 2010). Spelled "coerulescens" by Sandhouse (1939) and Mitchell (1962).