Lasioglossum (Dialictus) paradmirandum (Knerer and Atwood)

Gibbs, Jason, 2010, Revision of the metallic species of Lasioglossum (Dialictus) in Canada (Hymenoptera, Halictidae, Halictini) 2591, Zootaxa 2591 (1), pp. 1-382 : 237-240

Lasioglossum (Dialictus) paradmirandum (Knerer and Atwood)

( Figures 171A–D , 172A–F )

Dialictus paradmirandus Knerer and Atwood, 1966a: 886 . ♀ ♂. Holotype. ♀ CANADA, Ontario, Iona , Elgin Co., 1.ix.1963 on Solidago, (G. Knerer) , [ROM: 83856]. Examined.

Taxonomy. Hurd, 1979: Dialictus paradmirandus , p. 1969 (catalogue); Moure & Hurd, 1987: Dialictus paradmirandus , p. 119 (catalogue)

Diagnosis. Females of L. paradmirandum can be recognised by the diagnostic combination of mesoscutum tessellate with moderately dense punctures on the central disc (i=1–2d), mesepisternum tessellate-imbricate with shallow punctures, T1 acarinarial fan incomplete dorsally, metasomal terga coriarious, T1 declivitous surface with distinct microsculpture, T3–T4 with moderately dense tomentum partially obscuring surface and distinct fringes. They are most similar to L. fattigi and L. admirandum . Female L. fattigi have a more robust head, moderately sparse punctures on the lower paraocular area (i=1–1.5d), weakly imbricate mesoscutum and T3–T4 have sparse tomentum not obscuring surface and weak fringes ( Fig. 171D ). Female L. admirandum have the metasomal terga polished without evident microsculpture on the declivitous surface of T1.

Males of L. paradmirandum are similar to females but may be further distinguished by the moderately elongate head (length/width ratio = 1.03–1.04), elongate flagellomeres (length/width ratio = 1.69–1.83) with pale brownish yellow ventral surfaces, weakly reticulate dorsal portion and tessellate ventral portion of the mesepisternum, rounded posterior margin of the metapostnotum and impunctate apical impressed areas of the metasomal terga. They are most similar to L. mitchelli and L. fattigi . Male L. mitchelli have the posterior margin of the metapostnotum distinctly angled, more densely punctate mesoscutum and rugulose mesepisternum. Male L. fattigi have elongate heads (length/width ratio = 1.07) and the dorsal portion of the mesepisternum is imbricate-tessellate.

Description. FEMALE. Length 5.12–5.98 mm; head length 1.34–1.58 mm; head width 1.37–1.62 mm; forewing length 3.42–4.09 mm.

Colouration. Head and mesosoma pale golden green, sometimes bluish green. Clypeus with apical half blackish brown, basal half and supraclypeal area sometimes golden. Antenna dark brown, flagellum with ventral surface dark reddish brown. Tegula pale reddish brown. Wing membrane subhyaline, venation and pterostigma brownish yellow. Legs brown, medio- and distitarsi reddish brown. Metasoma dark brown, terga and sterna with apical margins translucent brownish yellow.

Pubescence. Dull white. Moderately sparse. Head and mesosoma with moderately dense woolly hairs (1– 1.5 OD), longest on genal beard, metanotum and mesopleuron (2–2.5 OD). Lower paraocular area and gena with sparse tomentum, not obscuring surface. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with sparse, fine setae. T1 acarinarial fan with wide dorsal opening, equal to width of lateral hair patches. T2 basolaterally and T3 with sparse tomentum partially obscuring surface. T4 with moderately dense tomentum obscuring most of surface. T2 apicolateral and T3–T4 apical margins with moderately strong fringes.

Surface sculpture. Face tessellate-imbricate, punctation moderately strong. Clypeus polished, punctation sparse (i=1–3d). Supraclypeal area with punctation sparse (i=1–3d). Lower paraocular area punctation dense (i≤d). Antennocular area punctation moderately dense (i=1–1.5d). Upper paraocular area, frons and ocellocular area reticulate-punctate. Gena weakly lineolate. Postgena imbricate. Mesoscutum tessellate, punctation fine, moderately dense between parapsidal lines (i=1–2d), dense laterad of parapsidal line (i≤d), and reticulate on anterolateral portions. Mesoscutellum similar to mesoscutum, submedial punctation sparse (i=1–2.5d). Axilla punctate. Metanotum imbricate. Preëpisternum weakly rugulose. Hypoepimeral area imbricate. Mesepisternum weakly tessellate-imbricate with obscure shallow punctures (i=1.5–2d). Metepisternum dorsal third rugoso-striate and ventral portion imbricate. Metapostnotum weakly rugoso-striate, posterior margin imbricate. Propodeum with dorsolateral slope ruguloso-imbricate, lateral and posterior surfaces tessellate. Metasomal terga coriarious, punctation on basal halves moderately dense (i=1–1.5d), obscure on apical halves (i=2–2.5d), T1 dorsal portion and T2 apical half virtually impunctate.

Structure. Head moderately wide (length/width ratio = 0.97–0.98). Eyes convergent below (UOD/LOD ratio = 1.26–1.28). Clypeus ½ below suborbital tangent, apicolateral margins strongly convergent. Antennal sockets moderately close (IAD/OAD <0.6). Frontal line carinate, ending 2.5 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3 teeth. Metapostnotum moderately elongate (MMR ratio = 1.16–1.30), posterior margin rounded onto posterior surface. Propodeum with oblique carina virtually absent, lateral carina weak, reaching halfway to dorsal margin.

MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 5.19– 5.61 mm; head length 1.40–1.54 mm; head width 1.34–1.50 mm; forewing length 3.23– 1.58 mm.

Colouration. Flagellum with ventral surface pale brownish yellow. Tarsi pale brownish yellow.

Pubescence. Face below eye emargination with moderately dense tomentum, partially obscuring surface. Lower paraocular area with dense tomentum obscuring surface. Gena with sparse tomentum not obscuring surface. T2–T4 basolaterally with very sparse tomentum. S2–S3 apicolaterally with moderately dense plumose hairs. S4–S5 laterally with dense plumose hairs.

Surface sculpture. Clypeus punctation moderately dense (i=1–2d). Metanotum rugulose. Hypoepimeral area rugulose. Mesepisternum dorsal portion ruguloso-reticulate and ventral portion ruguloso-imbricate. Metepisternum ruguloso-striate. Metapostnotum rugoso-striate, posterior margin imbricate. Propodeum dorsolateral slope rugose, lateral surface with anterior portion rugulose and posterior portion rugose, posterior surface rugose. Metasomal terga coriarious, punctation moderately dense throughout (i=1–2d) except apical impressed areas impunctate.

Structure. Head moderately elongate (length/width ratio = 1.03–1.04). Eyes strongly convergent below (UOD/LOD ratio =1.48–1.59). Clypeus 2/3 below suborbital tangent, apicolateral margins weakly convergent. Antennal sockets distant (IAD/OAD> 1.2). Frontal line carinate, ending 2 OD below median ocellus. Pedicel shorter than F1. F2 length 1.7–1.8X F1. F2–F10 (length/width ratio = 1.69–1.83). Metapostnotum moderately elongate (MMR ratio = 1.13–1.30), posterior margin rounded onto posterior surface.

Terminalia . S7 with median lobe narrowly acuminate, apex narrowly rounded. S8 with apicomedial margin weakly convex. Genitalia as in Fig. 172E–F . Gonobase with ventral arms widely separated. Gonostylus small, dorsal setae elongate. Retrorse lobe narrow, strongly attenuated apically.

Range. Ontario south to North Carolina, west to Wisconsin, Iowa ( Fig. 170 ).

Additional material examined. CANADA: ONTARIO: 3♂♂ Iona , 15.ix.1963 (G. Knerer) ; 4♂♂ Iona , 17.ix.1963 (G. Knerer); [ ROM] ; 2♀ Ipperwash , 25.v.1962 (G. Knerer); [ ROM] ; 1♀ Norfolk , N42°38.959´W080°34.124´, 18.ix.2007 (A. Taylor) ; 1♀ Vandorf , 26.v.1960; [ PCYU] ; 1♂ paratype Iona , 1.ix.1963 (G. Knerer) ; 1♀ paratype Iona , 10.ix.1963 (G. Knerer); [ CNC] ; USA: ILLINOIS: 1♀ Dwight , 25.vi.006 (J. Gibbs) ; 1♀ E of Carlinville , N39.2596 W089.5485, 25.vi.2006 (J. Gibbs) ; IOWA: 1♀ Allamakee Co., Waymiller Prairie , 12.5 km N Lansing, N43°27´15´´ W091°18´13´´, 323 m, 18.vi.2005 (D. Christensen); MARY- LAND: 1♀ Garrett Co., N39.5512 W079.299, 2004 (S.W. Droege) ; MISSOURI: 1f/ Montgomery Co., Danville , 4.vi.2000 (Arduser) ; NORTH CAROLINA: 1♀ Blue Ridge Parkway, near Jefferson , N36.34234 W081.37465, 13.viii.2006 (J. Gibbs); [ PCYU] ; PENNSYLVANIA: 1♀ Bucks Co., N40°26´10´´ W075°10´19´´, 14.vii.2005 (C. Locke) ; 1♀ Bucks Co., N40°23´05´´ W075°15´41´´, 21.vii.2005 ( R. Malfi) ; 1♀ Montgomery Co., N40°18´23´´ W075°24´13´´, 5.vii.2005 (C. Locke) ; 1♀ Montgomery Co., N40°18´23´´ W075°24´13´´, 11.vii.2005 ( R. Malfi); [ RWRU] ; WEST VIRGINIA: 1♀ Hampshire Co., N39.34106 W078.464, 29–30.v.2004 (S.W. Droege); [ PCYU] ; WISCONSIN: 1♀ Dane Co., Westport Drumlin , 11.vii.1996 ( R. A. Henderson); [ IRCW] ; 1♀ Sauk Co., Spring Green Preserve , N43.19785 W090.05904, 23.vii.2006 (A. Wolf); [ PCYU] .

Floral records. ASTERACEAE : Echinacea simulate , Solidago , Taraxacum , SALICACEAE : Salix .

Comments. Common. Females collected in spring or fall (including the holotype) are distinctly larger than summer specimens, presumably as a result of caste differences associated with eusociality. See comments for L. fattigi above.

Figures

FIGURE 170. Distribution of Lasioglossum pallidellum (dark grey), L. paradmirandum (medium grey), and L. pavoninum (light grey).

FIGURE 171. Lasioglossum paradmirandum (Knerer and Atwood). Female (A) lateral habitus; (B) dorsal habitus; (C) face; (D) metasomal terga. Scale bars, A–C = 1 mm.

FIGURE 172. Lasioglossum paradmirandum (Knerer and Atwood). Male (A) lateral habitus; (B) dorsal habitus; (C) face; (D) mesepisternum; (E) ventral view of genital capsule; (F) dorsal view of genital capsule. Scale bars, A–C = 1 mm, F = 0.5 mm.