Osmia watsoni (Watson's Mason Bee) | Natural Heritage New Mexico

Kingdom: Animalia

Phylum: Arthropoda

Class: Insecta

Order: Hymenoptera

Family: Megachilidae

Genus: Osmia

Species: watsoni

Watson's Mason Bee - Osmia watsoni

1377708

Species Extent (New Mexico)

Global Rank: G2

State Rank: S1

Rank Metadata
State Rank: S1	Rank Changed: 06/10/2025
Rank Reviewed: N/A
Reason: <i>Osmia watsoni </i>is a small and seemingly range restricted bee species in New Mexico. It is known from just three occurrences in the state and only has been recently observed at one of them which is the Sevilleta National Wildlife Refuge. The species also has a small Extent of Occurrence of just 2,257km2 and an Area of Occupancy of just 10km2 using all known occurrence records. At the one current occurrence at the Sevilleta 20 years of monitoring data showed a 80% decline in the species population there likely due to the threats of climate change and drought. As a result, this species is currently assessed as S1 in New Mexico.

Ecological Factors
Specificity: Unknown	Range Extent: 1000-5000 square km (about 400-2000 square miles)
Occurences: 1 - 5	Population Size: Unknown
Area of Occupancy: An Area of Occupancy of 10km2 was calculated using the NatureServe RARECAT tool with data from GBIF.org (GBIF.org (10 June 2025) GBIF Occurrence Download https://doi.org/10.15468/dl.q4kwhy)	Threat Summary: N/A

State Status:

Federal Status:

USFS Status:

BLM Status: Watch

SWAP Status: SGCN

NMRP Strategy Status:

Number of Subpopulations: 9

Number of Mapped Locations: 767

Number of Observations: 381

Observation date range: 04-11-1977 to 03-01-2014

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