Lasioglossum nigroviride

(Graenicher, 1911)

Black-and-green Metallic-Sweat bee, black-and-green dialictus sweat bee

Lasioglossum nigroviride is a small metallic sweat in the , placed in the subgenus Dialictus. The was described by Graenicher in 1911 and is one of numerous metallic Lasioglossum species in North America. Halictus (Chloralictus) richardsoni Cockerell was synonymized with this species in Gibbs's 2010 revision of Canadian Dialictus. Like other members of this large , it is a ground-nesting bee with likely solitary or semi-social .

Pronunciation

How to pronounce Lasioglossum nigroviride: /læsiːəˈɡlɒsəm nɪɡroʊˈvɪrideɪ/

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Identification

As a metallic Dialictus , L. nigroviride would be identified by the combination of: small size (typical for subgenus), metallic coloration, and specific features of punctation and . The species name 'nigroviride' suggests black-green metallic coloration. Precise identification requires microscopic examination and reference to Gibbs (2010), which provides species descriptions and illustrations for the 84 metallic Dialictus species in Canada. The species is distinguished from the synonymized Halictus richardsoni by priority of the earlier name.

Distribution

North America. Documented from Canada (included in Gibbs's 2010 revision of metallic Dialictus in Canada) and the United States (Vermont records in GBIF). The occurs within the broader range of the subgenus Dialictus, which is widespread across North America.

Similar Taxa

Other metallic Lasioglossum (Dialictus) speciesThe subgenus Dialictus contains over 1,700 globally, with 84 metallic species in Canada alone. These are notoriously difficult to distinguish without detailed morphological examination, which is why Gibbs (2010) provided comprehensive revision with keys and illustrations.
Lasioglossum nigroviride (misapplied as Halictus richardsoni)These names refer to the same ; Cockerell's Halictus richardsoni was synonymized under Graenicher's earlier L. nigroviride in 2010.

More Details

Taxonomic history

Originally described as Halictus nigroviridis by Graenicher in 1911, later transferred to Lasioglossum. Cockerell described Halictus (Chloralictus) richardsoni in 1930, which Gibbs (2010) determined to be a junior synonym of L. nigroviride based on examination of .

Research context

L. nigroviride is one of many halictid commonly captured in bowl traps used for monitoring. Like other small Lasioglossum species, it contributes to the challenge of bee biodiversity assessment due to the taxonomic difficulty of the group and the large numbers of specimens often collected in passive traps.