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Extracted from: Gardner, J. and J. Gibbs. 2020. The ‘red-tailed’ Lasioglossum (Dialictus) (Hymenoptera: Halictidae)
of the western Nearctic. European Journal of Taxonomy 725: 1–242
Diagnosis
Females of Lasioglossum clematisellum can be recognized by the characters for the L. clematisellum species complex (below), in addition to the metasomal terga lacking tomentum, the face and
mesepisternum often duller than in other species in this group, scutum with most hairs relatively thin and weakly plumose and punctures of anteromedian area indistinct, and head and mesosoma blue-green with
bright white hair. They are most similar to L. clastipedion sp. nov. and can only be separated with great difficulty, especially if specimens are worn. Females of L. clastipedion sp. nov. have the metasomal terga with at least some basolateral tomentum; this is the most reliable character. In addition, females of L. clastipedion sp. nov. often have the scutum with most hairs densely plumose and punctures of the anteromedian area distinct, and head and mesosoma more golden-green with slightly yellowish hair dorsally.
Males of L. clematisellum can be recognized by the characters for the Lasioglossum clematisellum species complex (below), in addition to the metasoma lacking tomentum, scutum with many hairs thin and weakly plumose, and frons densely punctate (i < 1 pd). They are most similar to L. julipile sp. nov., L. perditum sp. nov., and L. clastipedion sp. nov. All of these species have the scutum with most hairs thick and densely plumose and metasomal terga with at least some basolateral tomentum. In addition, L. julipile sp. nov. and L. perditum sp. nov. have the frons more sparsely punctate (i = 1–3 pd).
Redescription
Female
Colouration. Head and mesosoma blue-green to golden-green; clypeus apical colour reddish brown to orange; labrum reddish brown to orange; mandible orange with black basal spot or band and red tip; flagellum black to reddish brown dorsally, reddish brown to orange ventrally; ronotal lobe reddish brown to orange; metasoma red to orange with dark spiracular spots on T3–4; legs reddish brown with femur-tibia joints, tibia apices, and tarsi mostly orange; tegula pale amber; wing embrane hyaline,
veins with subcosta dark brown, otherwise pale amber.
Pubescence. Body hair colour white. Tomentum dense on paraocular area, gena, pronotal collar and
lobe, space between pronotal lobe and tegula, and metanotum anterior margin; sparse on clypeus basal
half, supraclypeal area, preëpisternum, metepisternum, and T4 basally. Scutum hair thin to slightly
densely plumose. Wing hairs light, very short and sparse. Acarinarial fan complete or nearly so, sparse.
T2 fringes very sparse, T3 fringes very sparse.
Surface sculpture. Clypeus punctures dense in basal half (i < 1 pd), large and irregularly spaced
apically (i < 2 pd), sculpture shiny, sometimes weakly tessellate basally; supraclypeal area punctures
sparse (i = 1–4 pd), becoming dense laterally (i ≤ 1 pd), sculpture shiny, sometimes becoming weakly
tessellate laterally; paraocular area punctures dense (i ≤ 1 pd), sometimes crowded around antenna
socket, sculpture shiny, sometimes weakly tessellate around antenna socket; frons punctures dense
(i < 1 pd), sculpture tessellate; vertex punctures fine, dense laterally (i ≤ 2 pd), moderately sparse
medially (i = 1–2 pd), sculpture shiny or weakly tessellate; gena punctures moderately sparse (i = 1–3 pd),
sculpture shiny; postgena sculpture tessellate and sometimes weakly rugulose; tegula punctures absent;
European Journal of Taxonomy 725: 1–242 (2020)
64
scutum punctures moderately dense (i ≤ 2 pd), becoming sparser submedially (i = 1–3 pd) and denser
posteromedially (i < 1 pd), sculpture shiny to weakly tessellate, becoming more strongly tessellate
anteromedially; scutellum punctures moderately dense (i ≤ 2 pd), becoming sparser submedially
(i = 1–3 pd) and denser posteromedially (i < 1 pd), diversopunctate, sculpture shiny, sometimes becoming
tessellate marginally and on median line; metanotum sculpture shiny and finely, densely punctate
(i < 1 pd), becoming rugulose laterally; metapostnotum rugae strong, highly anastomosing, reaching
margin, sculpture tessellate; preëpisternum sculpture areolate; hypoepimeron punctures dense (i < 1 pd),
sculpture shiny or weakly imbricate; mesepisternum punctures moderately dense (i = 1–2 pd), becoming
dense ventrally (i < 1 pd), sculpture shiny or weakly imbricate; metepisternum sculpture rugulosolineate
dorsally, areolate or tessellate and densely punctate (i < 1 pd) ventrally; propodeum lateral face
sculpture tessellate; propodeum posterior face sculpture tessellate; T1 anterior face sculpture shiny;
T1 dorsal surface punctures moderately sparse (i = 1–4 pd), becoming finer or obscure on rim and absent
in large apicolateral oval patches, sculpture shiny; T2 disc punctures moderately dense (i = 1–3 pd), disc
sculpture shiny, rim punctures very fine, sometimes obscure, sparse (i = 2–4 pd), rim sculpture weakly
coriarious.
Structure. Face length/width ratio 0.83 (± 0.02 SD). Clypeus projecting ~67% below suborbital
tangent; clypeal area length/width ratio 0.41 (± 0.04 SD); apicolateral denticles low rounded knobs;
supraclypeal area length/width ratio 0.67 (± 0.08 SD). Forewing with 3 submarginal cells; pronotal
angle obtuse; tegula shape normal. Intertegular distance 0.86 (± 0.03 SD) mm. Scutum length/width
ratio 0.78 (± 0.02 SD); scutum/scutellum length ratio 2.99 (± 0.16 SD); scutellum/metanotum length
ratio 1.51 (± 0.13 SD); metanotum/metapostnotum length ratio 0.65 (± 0.06 SD). Propodeum lateral
carinae not reaching dorsal margin; oblique carina very weak or absent. T2 depressed apical rim length
less than 50% of segment. (n = 11)
Male
Colouration. Head and mesosoma blue to olive green; clypeus apical colour black to reddish brown;
labrum reddish brown to orange; mandible orange with black basal spot and red tip; flagellum reddish
brown dorsally, orange ventrally; pronotal lobe reddish brown; metasoma black to dark reddish brown
with rims of terga and sterna broadly translucent reddish brown and downcurved lateral areas of terga
becoming translucent orange; legs reddish brown with femur-tibia joints, base and apex of tibiae, and
tarsi orange; tegula orange; wing membrane hyaline, veins dark to light brown.
Pubescence. Body hair colour white. Tomentum dense on face below eye emargination, gena, pronotal
angle and lobe, and space between pronotal lobe and tegula; sparse on episterna. Scutum hair thin to
moderately plumose. Sterna hair short (0.75–1.25 OD), densely plumose, dense and erect. Wing hairs
dark or light, short and sparse.
Surface sculpture. Clypeus punctures dense to moderately dense (i ≤ 2 pd), sculpture shiny; supraclypeal
area punctures dense to moderately dense (i ≤ 2 pd), sculpture shiny; paraocular area punctures dense
(i < 1 pd), sculpture shiny; frons punctures crowded (i = 0 pd), sculpture shiny to weakly imbricate;
vertex punctures moderately dense laterally (i = 1–2 pd), sparse medially (i = 1–3 pd), sculpture shiny
to imbricate; gena punctures fine, sparse (i = 1–3 pd), obscure, sculpture shiny, becoming weakly
ruguloso-lineate posteriorly and ventrally; postgena sculpture imbricate to ruguloso-lineate; tegula
punctures absent; scutum punctures dense to moderately sparse (i ≤ 2 pd), becoming sparse submedially
(i = 1–3 pd), sculpture shiny to weakly tessellate, becoming more strongly tessellate anteromedially;
scutellum punctures dense marginally and on median line (i ≤ 1 pd), sparse submedially (i = 1–3 pd),
sculpture shiny; metanotum sculpture shiny and densely to moderately sparsely punctate (i ≤ 2 pd);
metapostnotum rugae strong, anastomosing, reaching margin, sculpture shiny to weakly imbricate;
preëpisternum sculpture shiny with crowded punctures (i = 0 pd); hypoepimeron punctures dense
(i ≤ 1 pd), sculpture shiny; mesepisternum punctures dense (i ≤ 1 pd), sculpture shiny; metepisternum sculpture lineate dorsally, areolate-rugose ventrally; propodeum lateral face punctures obscure, sculpture
imbricate to rugulose; propodeum posterior face sculpture rugulose; T1 anterior face sculpture shiny;
T1 dorsal surface punctures dense (i ≤ 1 pd), becoming sparse towards rim (i = 1–3 pd) and absent
or very sparse in small apicolateral oval patches, sculpture shiny; T2 disc punctures dense (i ≤ 1 pd),
becoming sparse toward premarginal line (i = 1–3 pd), disc sculpture shiny, rim punctures sparse medially
(i = 1–4 pd), absent laterally, rim sculpture shiny.
Structure. Face length/width ratio 0.83 (± 0.02 SD). F1:pedicel length ratio 0.89 (± 0.13 SD); F2:F1
length ratio 1.97 (± 0.23 SD); F2 length/width ratio 1.56 (± 0.12 SD); F9 length/width ratio 1.39
(± 0.09 SD). Forewing with 2 or 3 submarginal cells; pronotal angle obtuse; tegula shape
normal. Intertegular distance 0.75 (± 0.05 SD) mm. Scutum length/width ratio 0.89 (± 0.05 SD); scutum/
scutellum length ratio 2.77 (± 0.14 SD); scutellum/metanotum length ratio 1.68 (± 0.17 SD); metanotum/
metapostnotum length ratio 0.66 (± 0.03 SD). Propodeum lateral carinae not reaching dorsal margin;
oblique carina absent. (n = 10)
Genitalia. As in Fig. 90C. Gonocoxite relatively narrow, rounded. Gonostylus with a few long hairs.
Retrorse lobe relatively narrow, ovoid, covered in sparse short hairs.
Range
Southwestern Montana south to Zacatecas and west to California (Fig. 30).
Floral records
AIZOACEAE Martinov: Trianthema L. T. portulacastrum L. • AMARANTHACEAE Juss.
Atriplex L. A. canescens (Pursh) Nutt. • Chenopodium L. C. desiccatum A. Nelson • C. neomexicanum
Standl. • Salsola L. S. kali L. S. k. subsp. tragus (L.) Čelak. • ANACARDIACEAE R.Br. Schinus
L. S. molle L. (MH87) • APIACEAE Lindl. Apium L. A. graveolens L. (MH87) • ASPARAGACEAE
Juss. Nolina Michx. (MH87) • ASTERACEAE Giseke: Baccharis: B. salicina Torr. & A.Gray •
B. sarothroides A. Gray • Chrysothamnus (MH87) • Ericameria: E. palmeri (A.Gray) H. M. Hall
(MH87) • Erigeron: E. bonariensis L. (MH87) • E. canadensis L. (MH87) • Euthamia: E. occidentalis
Nutt. (MH87) • Gutierrezia: G. californica (DC.) Torr. & A.Gray (MH87) • G. sarothrae (Pursh)
Britton & Rusby (MH87) • Helenium: H. laciniatum A.Gray • Helianthus: H. annuus L. • H. petiolaris
Nutt. • Heliomeris: H. multiflora Nutt. H. m. var. nevadensis (A. Nelson) W. F. Yates • Laennecia:
L. coulteri (A.Gray) G.L. Nesom • Lepidospartum: L. squamatum (A.Gray) A.Gray (MH87) • Pectis •
Senecio: S. flaccidus Less. • Solidago (MH87) • BORAGINACEAE Juss. Cryptantha Lehm. ex
G.Don: C. intermedia (A. Gray) Greene (MH87) • Phacelia Juss. P. crenulata Torr. ex S. Watson •
P. distans Benth. (MH87) • P. heterophylla Pursh (MH87) • BRASSICACEAE Burnett: Alyssum L. •
Hirschfeldia: H. incana (L.) Lagr.-Foss. (MH87) • Lepidium L. L. alyssoides A.Gray • L. integrifolium
Nutt. • L. thurberi Wooton • Lobularia Desv. L. maritima (L.) Desv. (MH87) • Physaria (Nutt. ex Torr. &
A.Gray) A.Gray: P. gordonii (A.Gray) O’Kane & Al-Shehbaz • Sisymbrium L. S. irio L. (MH87) •
CLEOMACEAE Bercht. & J. Presl: Cleome L. C. lutea Hook. • Wislizenia Engelm. W. refracta
Engelm. • CONVOLVULACEAE Juss. Convolvulus L. C. arvensis L. • CRASSULACEAE J. St.-
Hil. Sedum L. (MH87) • EUPHORBIACEAE Juss. Croton L. C. californicus Müll. Arg. (MH87) • C.
setigerus Hook. (MH87) • Euphorbia L. E. albomarginata Torr. & A.Gray • FABACEAE Juss. Amorpha:
A. fruticosa L. • Dalea: D. candida Willd. D. c. var. oligophylla (Torr.) Shinners • Melilotus • Prosopis:
P. glandulosa Torr. P. g. var. torreyana (L.D. Benson) M.C. Johnst. • P. juliflora (Sw.) DC. • P. velutina
Wooton • Psorothamnus: P. scoparius (A.Gray) Rydb. • LAMIACEAE Martinov: Mentha L. M. spicata
L. (MH87) • LOASACEAE Juss. Mentzelia L. M. laevicaulis (Douglas) Torr. & A. Gray (MH87) •
MALVACEAE Juss. Sphaeralcea A. St.-Hil. • PAPAVERACEAE Juss. Eschscholzia Cham. E. californica
Cham. (MH87) • PLANTAGINACEAE Juss. Penstemon Schmidel: P. superbus A. Nelson • Plantago
L. • POLEMONIACEAE Juss. Eriastrum Wooton & Standl. E. virgatum (Benth.) H. Mason (MH87) •
POLYGONACEAE Juss. Eriogonum Michx. E. abertianum Torr. • E. fasciculatum Benth. • E. gracile
Benth. (MH87) • Persicaria Mill. P. lapathifolia (L.) Delarbe (MH87) • RANUNCULACEAE Juss.
Clematis L. C. ligusticifolia Nutt. • ROSACEAE Juss. Fallugia Endl. F. paradoxa (D. Don) Endl. ex
Torr. • Prunus L. (MH87) • SALICACEAE Mirb. Salix L. S. exigua Nutt. (MH87) • S. lasiolepis Benth.
(MH87) • S. nigra Marshall (MH87) • SAPINDACEAE Juss. Sapindus L. S. drummondii Hook. & Arn. •
TAMARICACEAE Link: Tamarix L. T. ramosissima Ledeb. • VERBENACEAE J. St.-Hil. Glandularia
J.F. Gmel. G. bipinnatifida (Schauer) Nutt. • Lantana L. (MH87) • ZYGOPHYLLACEAE R.Br. Larrea
Cav. L. tridentata (Sessé & Moc. ex DC.) Coville.
Remarks
Common. The male is described here for the first time. Lasioglossum clematisellum has an extremely
wide distribution, but unlike the similarly-distributed L. hudsoniellum, L. clematisellum is not found at
very high elevations and is more common in deserts.
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