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Lasioglossum pectinatum (Robertson, 1890)
Halictus pectinatus Robertson, 1890; Evylaeus pectinatus (Robertson, 1890)

Life   Insecta   Hymenoptera   Apoidea   Halictidae   Lasioglossum
Subgenus: Hemihalictus

Lasioglossum pectinatum, f grass --
Michael Veit · 6
Lasioglossum pectinatum, f grass --

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Lasioglossum pectinatum, f grass --
Michael Veit · 6
Lasioglossum pectinatum, f grass --
Lasioglossum pectinatum, f on Ph --
Michael Veit · 6
Lasioglossum pectinatum, f on Ph --

Lasioglossum pectinatum, f on Ph --
Michael Veit · 6
Lasioglossum pectinatum, f on Ph --
Lasioglossum pectinatum, F, Back, MD
© Copyright source/photographer · 5
Lasioglossum pectinatum, F, Back, MD

Lasioglossum pectinatum, F, Face, MD
© Copyright source/photographer · 5
Lasioglossum pectinatum, F, Face, MD
Lasioglossum pectinatum, F, Side, MD
© Copyright source/photographer · 5
Lasioglossum pectinatum, F, Side, MD

Lasioglossum pectinatum, F, Back, MD
© Copyright source/photographer · 5
Lasioglossum pectinatum, F, Back, MD
Lasioglossum pectinatum, F, Face, MD
© Copyright source/photographer · 5
Lasioglossum pectinatum, F, Face, MD

Lasioglossum pectinatum, F, Side, MD
© Copyright source/photographer · 5
Lasioglossum pectinatum, F, Side, MD
Lasioglossum pectinatum, F, Back, MD
© Copyright source/photographer · 5
Lasioglossum pectinatum, F, Back, MD

Lasioglossum pectinatum, F, Face, MD
© Copyright source/photographer · 5
Lasioglossum pectinatum, F, Face, MD
Lasioglossum pectinatum, F, Side, MD
© Copyright source/photographer · 5
Lasioglossum pectinatum, F, Side, MD
Overview
Reprinted with permission from: Mitchell, T.B. 1960 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.


FEMALE�Length 8 mm. black; pubescence whitish, extremely short and thin; head considerably longer than broad; clypeus strongly protuberant, projecting fully two-thirds below suborbital line; eyes very slightly convergent below; cheeks very slightly narrower than eyes; lateral ocelli very slightly nearer margin of vertex than to eyes; face above antennae rather dull medially, with fine and close but deep and distinct punctures, lateral portions of face shining, with sparse, deep and distinct punctures; supraclypeal area protuberant, shining, punctures fine, well separated above, becoming sparse below; clypeus shining, punctures sparse, rather fine basally, apical half almost impunctate; area between eyes and ocelli shining, punctures minute, well separated but distinct; vertex medially somewhat shining, very minutely and obscurely punctate; cheeks shining, punctures minute, well separated but not sparse above, becoming quite widely separated below, ventral surface quite flat, separated from lateral surfaces by a rounded ridge, quite smooth, with only a few, scattered, obscure punctures; scutum shining, punctures rather fine, but deep and distinct, well separated but not sparse, quite evenly distributed over entire disc; scutellum shining, with a median, slight impression which is quite closely and finely punctate, the punctures on each side very sparse; pleura shining, with fine, scattered, quite deep and distinct punctures, becoming somewhat obscurely and finely striate anteriorly; dorsal area of propodeum with a rather narrow, basal fringe of fine striae, posterior portion smooth and shining, rounded, the posterior face quite densely pubescent, obscurely reticulate, the lateral carinae strongly divergent, incomplete; wings very faintly infuscated, veins and stigma brownish-ferruginous; tegulae brownish-ferruginous, with piceous blotches, anterior rim rather narrowly hyaline; legs more or less reddened, hind basitibial plate rather narrowly rounded; abdominal terga somewhat shining, punctures of the more basal terga deep, distinct, close, fine and rather evenly distributed, becoming more minute and indistinct on the more apical terga, basal fasciae inevident, discal pubescence extremely short and thin, sub- erect, entirely pale except on apical tergum where it is more brownish.

DISTRIBUTION � Connecticut, New Jersey and Maryland, to Illinois and Missouri.

FLOWER RECORDS�Physalis. Robertson (1929) records this on Circaea, Lutetianat, Cryptotaenia canadensi, Helianthus tuberosus and Physalis virginiana. Although it would appear that Robertson collected this species a number of times, it is very poorly represented in any of the collections that this writer has studied. The type has been seen, and one specimen from the U. S. National Museum, collected at Plummers Island, Maryland, July 10, 1909, on Physalis heterophyllum, by J. C. Crawford, is now on hand. This was compared with the type, in the Illinois Natural History Survey, and made a homotype. The male of peetinatus has never been recognized, but it seems possible that bradleyi, described next, is this species.


Identification
This is a large species, 8-9mm, has 2 distinct size of pits on scutum large ones and a set of MICROSCOPIC smaller ones interspersed on a relatively smooth and glossy background, the large pits spaced out relatively more than other black 2 weak veined species, There is a very distinct raised line, carina, running down from the top of the humeral angle of the pronotum and running toward the head. The humeral angle sharp and nearly 90 degrees in its angle, Terga with dense, less than 0.5 apart, large, deep pits that go nearly to the rim. Gray appressed hairs on metanotum line the anterior edge and expand out to less occupy less than 50% of the central segment. The pronotal collar has bright white appressed hairs throughout.

Extracted from: Gibbs, J., Packer, L., Dumesh, S. and Danforth, B. N. 2013. Revision and reclassification of Lasioglossum (Evylaeus), L. (Hemihalictus) and L. (Sphecodogastra) in eastern North America (Hymenoptera: Apoidea: Halicidae). Zootaxa 3672 (1). Pp 1-116.

Diagnosis. Both sexes of L. pectinatum can be recognised by the combination of pronotum with carinate dorsolateral ridge, mesepisternum distinctly punctate (Fig. 76B), and mesoscutum polished due to lack of microsculpture. Neither sex has metapostnotal rugae reaching the posterior margin. Female L. pectinatum can be recognised by the unique inner metatibial spur, with approximately 15–20 short, narrow teeth, lengths not exceeding width of rachis (Fig. 5H). Female L. swenki are superficially similar but can be recognised by mesoscutum with imbricate microsculpture and inner metatibial spur with few, long teeth (Fig. 5K)

Male L. pectinatum can be recognised by the combination of mandible elongate, extending to opposing clypeal base (Fig. 6H); gena wide, with sharp angle or tubercle at midlength (Fig. 31); and clypeus with narrow, distal maculation (Fig. 6H). Males of L. fedorense, L. sopinci, and L. swenki also have long mandibles, but all three have a clypeal maculation extending the full length of the clypeus (Figs. 6B, 6J, 6K).

Redescription. FEMALE. Length 7.1–7.3 mm. Head length 1.97–2.08 mm. Head width 1.92–2.00 mm. Wing length 5.5–6.6 mm. (n=4)

Colour. Head and mesosoma black. Antenna black, except ventral surface of flagellum reddish brown. Tegula dark reddish brown. Legs dark brown, except medio- and distitarsi reddish brown. Wing membrane hyaline. Pterostigma reddish brown. Metasomal terga black-brown, apical margins reddish brown.

Structure. Head long (L/W ratio = 1.02–1.04). Clypeus 2/3–3/4 below suborbital line. Eyes convergent below (UOD:LOD = 1.02–1.09). Gena narrower than eye. Ocelli normal. Pronotal ridge sharply angled. Protibial spur with apical serrations longer or subequal to length of malus. Inner metatibial spur pectinate, teeth 15–20, basal teeth subequal to width of rachis. Propodeal lateral carina not reaching dorsal margin, oblique carina absent.

Surface sculpture. Supraclypeal area polished, punctures sparse. Gena and postgena polished. Mesoscutum polished, punctures distinctly separated throughout. Mesepisternum smooth, polished, distinctly punctate. Metapostnotum carinate-rugose basally, apical margin weakly imbricate. Propodeum imbricate-tessellate, dorsolateral slope smooth, punctate. Metasomal terga polished, apical impressed areas weakly coriarious; punctures deeps, dense throughout, narrowly impunctate on apical margin.

Pubescence. Head and mesosoma with sparse plumose hairs. Metafemoral scopa with dense plumose hairs. Metasomal terga without apical fimbriae. T1 with sparse, erect plumose hairs. Metasomal sterna with densely plumose scopa.

MALE. Length 5.3–6.0 mm. Head length 1.68–1.92 mm. Head width 1.65–1.9 mm. Wing length 4.5–4.7 mm. (n=2)

Colour. Head and mesosoma black. Clypeus yellow distally. Mandible yellow. Labrum yellow. Antenna black, except ventral surface of flagellum reddish brown. Legs dark brown, except tarsi and inner surface of protibia reddish brown. Wing membrane hyaline. Pterostigma reddish brown. Metasomal terga dark brown.

Structure. Head relatively long (L/W ratio = 0.97–1.02). Mandible long, reaching opposing mandibular base. Flagellomeres, except F1, moderately elongate, F2 longer than F1 and pedicel combined, much shorter than scape. Eyes weakly convergent below (UOD:LOD = 1.02–1.11). Gena much wider than eye, tuberculate at midlength. Pronotal ridge sharply angled. Propodeal lateral carina not reaching dorsal margin.

Surface sculpture. Supraclypeal area polished, punctures sparse. Gena and postgena polished. Mesoscutum polished, punctures clearly separated throughout. Mesepisternum polished, distinctly punctate. Metapostnotum polished-weakly imbricate, with short carinulae basally. Propodeum imbricate, posterior surface polished. Metasomal terga polished; punctures deep, close basally. T2–T6 apical impressed areas impunctate.

Pubescence. Head and mesosoma with sparse plumose hairs. Paraocular area below eye emargination with relatively sparse tomentum. Propodeum largely bare, with scattered plumose hairs. Metasomal terga nearly bare, apical fimbriae absent. Metasomal sterna with relatively long (1.5–2.5 OD), plumose hairs, except S5–S6 relatively bare.


Names
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FamilyScientific name @ source (records)
Solanaceae  Physalis heterophylla @ CUIC_ENT (9)

Physalis longifolia @ CUIC_ENT (1)

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Updated: 2021-06-15 06:08:48 gmt
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