Lasioglossum (Dialictus) oblongum (Lovell)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 154-155

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Lasioglossum (Dialictus) oblongum (Lovell)


Lasioglossum (Dialictus) oblongum (Lovell) View in CoL

Halictus oblongus Lovell, 1905a: 40 . Ƥ 3.

Syntypes. Ƥ3 USA, Maine, Waldoboro, 24.viii, on Eupatorium perfoliatum View in CoL [depository unknown].

Taxonomy. Lovell, 1905a: Halictus versans 3, p. 39 (misdet.); Lovell, 1908: Halictus (Chloralictus) oblongus 3, p. 38 (description); Michener, 1951: Lasioglossum (Chloralictus) oblongum View in CoL , p. 1115 (catalogue); Mitchell, 1960: Dialictus oblongus Ƥ3, p. 409 (redescription, key); Krombein, 1967: Lasioglossum (Dialictus) oblongum View in CoL , p. 465 (catalogue); Hurd, 1979: Dialictus oblongus , p. 1969 (catalogue); Moure & Hurd, 1987: Dialictus oblongus , p. 116 (catalogue); Gibbs, 2010b: Lasioglossum (Dialictus) oblongum View in CoL Ƥ3, p. 211 (redescription, key).

Diagnosis. Female L. oblongum can be recognised by the following diagnostic combination: head wide (length/ width ratio = 0.94–0.95); supraclypeal area densely punctate (i≤d); mesoscutum imbricate, punctures moderately sparse between parapsidal lines (i=1–2d); mesepisternum weakly rugose; metapostnotum coarsely carinate with shining interstitial areas; T1 acarinarial fan with wide dorsal opening; and metasomal terga polished, appressed tomentum virtually absent.

Male L. oblongum are similar to females but may be further distinguished by the head relatively elongate (length/ width ratio = 0.98–1.01), flagellomeres moderately elongate (length/width ratio = 1.54–1.58), and S3 –S5 apicolateral portions with moderately dense, plumose hairs.

Range. Quebec, Ontario, south to Virginia, east to Massachusetts. USA: DC, DE, IN, MA, MD, NJ, NY, VA, WI. CANADA: ON, PQ.

DNA Barcode. Available. Multiple sequences.

Comments. Uncommon.

Lasioglossum oblongum has been reported to nest in rotten wood (Sakagami & Michener 1962). Individuals of L. oblongum , in the sense used here, have indeed been collected from under the bark of fallen logs.

The name L. oblongum has been applied in a sense believed to be consistent with standard usage in the last 50 years (see Mitchell 1960; Gibbs 2010b). Until the type series is located, it remains unclear if the species referred to here as L. oblongum is the same as the one described by Lovell (1905a).














Lasioglossum (Dialictus) oblongum (Lovell)

Gibbs, Jason 2011

Halictus oblongus

Lovell 1905: 40
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