Lasioglossum (Dialictus) michiganense (Mitchell)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 144-145

Lasioglossum (Dialictus) michiganense (Mitchell)

Paralictus michiganensis Mitchell, 1960: 448 . Ƥ.

Holotype. Ƥ USA, Michigan, Wayne Co., 2.vi.1940, [ NCSU].

Taxonomy. Krombein, 1967: Lasioglossum (Paralictus) michiganense , p. 467; (catalogue); Hurd, 1979: Paralictus michiganensis , p. 1974 (catalogue); Moure & Hurd, 1987: Paralictus michiganensis , p. 143 (catalogue); Gibbs, 2010b: Lasioglossum (Dialictus) michiganense Ƥ3, p. 191 (redescription, key).

Diagnosis. Female L. michiganense can be recognised by the following diagnostic combination: head wide (length/ width ratio = 0.84–0.85); labrum with apical process flat, dorsal keel absent ( Fig. 6 B); mandible with preapical tooth present ( Fig. 30 B); gena wider than eye; and mesepisternum with vertical carinula.

Male L. michiganense can be recognised by the following diagnostic combination: pronotum strongly carinulate; mesoscutum with weak microsculpture, punctures fine, sparse between parapsidal lines; metasomal sterna with very sparse hairs; and S7 median lobe clavate. They are most similar to L. platyparium , which has S7 median lobe acuminate.

Range. Southern Ontario south to North Carolina, west to Wisconsin. USA: DC, IL, MI, NC, NY. CANADA: ON.

DNA Barcode. Available. Multiple sequences.

Comments. Rare.

Lasioglossum michiganense is presumed to be a social parasite or cleptoparasite of nest-building Lasioglossum (Dialictus) .

Figures

FIGURE 6. Labrum of female Dialictus; (A) nest-building species, (B) parasitic species. Arrows indicate apical process. (From Gibbs 2010 b).

FIGURE 30. Mandible (A) without preapical tooth, (B) with preapical tooth (indicated by arrow). (From Gibbs 2010 b).