Lasioglossum (Dialictus) laevissimum (Smith)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216: 129-130

publication ID

http://doi.org/ 10.5281/zenodo.1049595

publication LSID

lsid:zoobank.org:pub:B5AF6DF4-D3A7-4942-A94F-CC051D8074CF

persistent identifier

http://treatment.plazi.org/id/9A5987DB-A796-FF36-0A97-8E39FB6D01C6

treatment provided by

Plazi

scientific name

Lasioglossum (Dialictus) laevissimum (Smith)
status

 

Lasioglossum (Dialictus) laevissimum (Smith)  

Halictus laevissimus Smith, 1853: 72   . Ƥ.

Holotype. Ƥ Canada, Manitoba, Arctic America. South of Lake Winnipeg, [ BMNH: B.M. Type 17a 1002]. Examined. Halictus levissimus Dalla Torre, 1896: 68 (Emend.)  

Halictus euryceps Ellis, 1914: 98   . Ƥ.

Holotype. Ƥ USA, New Mexico, Beulah, end of August, (Cockerell); [ CAS: 15605]. Examined. Halictus (Chloralictus) phaceliarum Cockerell, 1919: 299   . Ƥ.

Holotype. Ƥ USA, Colorado, Peaceful Valley, Colorado, 26.viii. 1918 (W.P. Cockerell); [ NMNH: 40260]. Examined. Halictus (Chloralictus) praepes Sandhouse, 1924: 30   . 3.

Holotype. 3 USA, Colorado, Peaceful Valley, 1919 (Cockerell); [ NMNH: 26430]. Examined. Halictus (Chloralictus) astutus Sandhouse, 1924: 31   . 3.

Holotype. 3 USA, New Mexico, Beulah, 18.viii. (W. Porter); [ NMNH: 26431]. Examined. Halictus (Chloralictus) abundus Sandhouse, 1924: 32   . 3.

Holotype. 3 USA, New Mexico, Beulah, end of viii (Cockerell); [ NMNH: 26432]. Examined. Halictus (Chloralictus) tranquillum Sandhouse, 1924: 32   . 3.

Holotype. 3 USA, New Mexico, Santa Fe, vii (Cockerell); [ NMNH: 26433]. Examined. Halictus (Chloralictus) jameseae Cockerell, 1933: 41   . 3.

Holotype. 3 USA, Colorado, Pingree Park, 15.viii. 1932, (M. James); [ CAS: 15610]. Examined. Dialictus orbitatus Mitchell, 1960: 440   . 3. [new synonymy]

Holotype. Ƥ USA, North Carolina, Bluff Park, Scenic Hgwy.   , [Doughton Park, Blue Ridge Pkwy], 24.vi. 1948 (T.B. Mitch-

ell); [ NCSU]. Examined.

Dialictus solidaginis Mitchell, 1960: 443   . 3.

Holotype. 3 USA, Michigan, Marquette Co., 20.vi. 1955 (R.R. Dreisbach); [ NCSU]. Examined.

Taxonomy. Cockerell, 1905: Halictus laevissimus   Ƥ, p. 351 (tax. notes); Michener, 1951: Lasioglossum (Chloralictus) abundus   , p. 1111, L. (C.) astutus   p. 1112, L. (C.) jameseae   , p. 1114, L. (C.) laevissimum   , p. 1114, L. (C.) phaceliarum   , p. 1116, L. (C.) praepes   , p. 1116, L. (C.) tranquillum   , p. 1118 (catalogue); Mitchell, 1960: Dialictus laevissimus   Ƥ(3 misdet.), p. 401 (redescription, key); Knerer & Atwood, 1962 a: Dialictus laevissimus   3, p. 1228 (description); Krombein, 1967: Lasioglossum (Dialictus) laevissimum   , p. 464, L. (D.) orbitatum   , p. 465, L. (D.) solidaginis   , p. 466 (catalogue); Hurd, 1979: Dialictus abundus   , p. 1963, D. astutus   , p. 1964, D. jameseae   , p. 1967, D. orbitatus   , p. 1969, D. phaceliarum   , p. 1970, D. praepes   , p. 1970, D. solidaginis   , p. 1971, D. tranquillus   , p. 1972 (catalogue); Moure & Hurd, 1987: Dialictus abundus   , p. 87, D. astutus   , p. 91, D. jameseae   , p. 109, D. orbitatus   , p. 118, D. phaceliarum   , p. 121, D. praepes   , p. 124, D. solidaginis   , p. 130, D. tranquillus   , p. 135 (catalogue); Gibbs, 2010 b: Lasioglossum (Dialictus) laevissimum   Ƥ 3, p. 170 (redescription, key, synonymies).

Diagnosis. Female L. laevissimum   can be recognised by the following diagnostic combination: size large (5.1–7.1 mm); head wide (length/width 0.89–0.95); gena often wider than eye, especially in larger individuals; mesoscutal punctures sparse between parapsidal lines (i= 1–3 d); mesepisternum rugulose; metapostnotum incompletely carinulate; T 1 acarinarial fan nearly complete, dorsal opening narrow; metasomal terga blackish brown, apical halves impunctate (except along premarginal line), and T 3 usually with sharply contrasted basal band of white tomentum. They are similar to L. smilacinae   , which lacks any dorsal opening in the T 1 acarinarial fan, and have metasomal terga with distinctly punctate apical impressed areas.

Male L. laevissimum   can be recognised by the following diagnostic combination: size large (5.4–6.7 mm); face with dense tomentum limited to lower paraocular area; flagellomeres elongate (length/width ratio = 1.64 –2.00); mesoscutum moderately polished due to weak microsculpture; mesepisternum rugulose, obscurely punctate ventrally; apical impressed areas of metasomal terga impunctate; and S 3 with dense hairs. They are most similar to L. abanci   and L. ephialtum   . Male L. abanci   have S 3 with sparse hairs limited to apical portion. Male L. ephialtum   , which has the mesoscutum dull due to microsculpture.

Range. Nova Scotia west to British Columbia, south to New Mexico. USA: CO, IL, MD, ME, MI, MN, NC, ND, NH, NM, NY, OH, PA, SD, UT, WI, WV. CANADA: AB, BC, MB, NB, NF, NS, NT, ON, PE, PQ, SK.

DNA Barcode. Available. Multiple sequences.

Comments. Common.

Lasioglossum laevissimum   is known to form eusocial colonies ( Packer 1992; Packer & Owen 1994).

Dialictus orbitatus   is removed from synonymy with L. obscurum   and placed into synonymy with L. laevissimum   . Halictus smilacinae   , long considered to be a synonym of L. laevissimum   , is resurrected (see below).

CAS

California Academy of Sciences

NMNH

Smithsonian Institution, National Museum of Natural History

NCSU

North Carolina State University Insect Museum

DNA

Department of Natural Resources, Environment, The Arts and Sport

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Halictidae

Genus

Lasioglossum

Loc

Lasioglossum (Dialictus) laevissimum (Smith)

Gibbs, Jason 2011
2011
Loc

Dialictus solidaginis

Mitchell 1960: 443
1960
Loc

Halictus laevissimus

Smith 1853: 72
1853