Unarmed Mason Bee

Osmia inermis

General Status Rank: 
Undetermined
Common Name: 
Unarmed Mason Bee
Scientific Name: 
Osmia inermis
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Taxonomy
Group: 
Hymenoptera (Bee)
Kingdom: 
Animalia
Phylum: 
Arthropoda
Class: 
Insecta
Order: 
Hymenoptera
Family: 
Megachilidae
Habitat
named from their habit of making compartments of mud in their nests, which are made in hollow reeds or holes in wood made by wood boring insects
Distribution

Ecozones

Southern Arctic, Taiga Shield
References: 
H265

Distribution

In Canada known from YT, NT, NU, BC, MB, ON, QC, NB, NS and NL. Widespread in many ecozones across Canada. Presumably a floral specialist of Vaccinium (at least in the Nearctic region, may be different floral specialist in western regions). Actual distribution of the bee may be more widespread based on the distribution of its floral host. Holactic species (HSS010).
Score: 
FG
References: 
HSS010

Number of Occurrences

2 old records: Tuk pen and AMNH record (unknown location);
Score: 
U
References: 
H265
HSS010

Area of Occupancy

Score: 
-
References: 
HSS010
Population

Population Size

Population size unknown, not possible to estimate (HSS010).
Score: 
U
References: 
HSS010
Trends

Trends

SHORT TERM: Presumably stable.
Score: 
C
References: 
HSS010
Threats

Threats

Cumulative threats from habitat loss and/or conversion to agriculture/urban development, invasive non-native species, climate change, livestock grazing, recreational use, etc. (as outlined in short and long-term trends) have all likely contributed to declines in bee abundance. The specific impact to each bee species is unknown due to lack of specimen data, surveys, natural history information of a species and analysis of these impacts on these variables (HSS010).
References: 
HSS010

Intrinsic Vulnerability

Score: 
-
References: 
HSS010
General Status Rank
Rank: 
Undetermined
Status Rank Description: 
Holarctic; boreal/arctic indistribution; considered at risk in the UK; nests under rocks;
S Rank: 
SU
Decision Process Description: 
Draft rank by C Sheffield (2011) (H253); Rank reviewed in 2014 by Cory Sheffield using the NatureServe Canada Rank Calculator; Reviewed in 2020 by C Sheffield, no change
Last Updated: 
November 24, 2020

References

Area of Occupancy

  • Hebert, Remi (2014) A set of 2 e-mails GS bees and GS bees - Abeilles SG with ranks proposed by Cory Sheffield and Jennifer Heron (07/08/2014). - HSS010 Return

Ecozones

  • Dumesh, S and Sheffield, C.S. (2012) NWT Bee Database 31 May 2012 - Updated with latlong June 2012. copy in Excel - H265 Return

Intrinsic Vulnerability

  • Hebert, Remi (2014) A set of 2 e-mails GS bees and GS bees - Abeilles SG with ranks proposed by Cory Sheffield and Jennifer Heron (07/08/2014). - HSS010 Return

Number of Occurrences

  • Dumesh, S and Sheffield, C.S. (2012) NWT Bee Database 31 May 2012 - Updated with latlong June 2012. copy in Excel - H265 Return
  • Hebert, Remi (2014) A set of 2 e-mails GS bees and GS bees - Abeilles SG with ranks proposed by Cory Sheffield and Jennifer Heron (07/08/2014). - HSS010 Return

Population Size

Hebert, Remi (2014) A set of 2 e-mails GS bees and GS bees - Abeilles SG with ranks proposed by Cory Sheffield and Jennifer Heron (07/08/2014). - HSS010 Return

Range Extent

  • Hebert, Remi (2014) A set of 2 e-mails GS bees and GS bees - Abeilles SG with ranks proposed by Cory Sheffield and Jennifer Heron (07/08/2014). - HSS010 Return

Short Term Trends

  • Hebert, Remi (2014) A set of 2 e-mails GS bees and GS bees - Abeilles SG with ranks proposed by Cory Sheffield and Jennifer Heron (07/08/2014). - HSS010 Return

Threats

  • Hebert, Remi (2014) A set of 2 e-mails GS bees and GS bees - Abeilles SG with ranks proposed by Cory Sheffield and Jennifer Heron (07/08/2014). - HSS010 Return