D I S C O V E R    L I F E   
Bee Hunt! Odonata Lepidoptera 
  HomeAll Living ThingsIDnature guidesGlobal mapperAlbumsLabelsSearch
  AboutNewsEventsResearchEducationProjectsStudy sitesHelp


Lasioglossum swenki (Crawford, 1906)
Halictus swenki Crawford, 1906; Evylaeus swenki (Crawford, 1906)

Life   Insecta   Hymenoptera   Apoidea   Halictidae   Lasioglossum
Subgenus: Hemihalictus

Lasioglossum swenki FEM mm x ZS PMax
© Copyright Laurence Packer 2014 · 7
Lasioglossum swenki FEM mm x ZS PMax

Click on map for details about points.

Links
80x5 - 240x3 - 240x4 - 320x1 - 320x2 - 320x3 - 640x1 - 640x2
Set display option above.
Click on image to enlarge.
Lasioglossum swenki MALE mm .x ZS PMax
© Copyright Laurence Packer 2014 · 7
Lasioglossum swenki MALE mm .x ZS PMax
Identification
A large species, 7 - 7.5 mm, with T1-3 a very noticable red-orange color in contrast to the dark nearly black segments T4-5. Metanotum with a large central patch of appressed, short, thick hairs in the center of segment and most of the sides. That patch taking up about 33-100 percent of the segment. Those same hairs fringing the entire scutum, across the entire pronotum, and sometimes across the mesepisturnum. Allotype and paratype seen.

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. Female L. swenki can be recognised by the combination of pronotum sharply angled; mesoscutum imbricate, dull; hypoepimeral area finely punctate (Fig. 78A); and inner metatibial spur pectinate with five narrow teeth, basal tooth much longer than width of rachis (Fig. 5K). Lasioglossum swenki can be easily distinguished from all eastern species by the characters listed above, except L. fedorense. In L. fedorense the carina is more complete and extends anterior to the oblique sulcus. In L. fedorense, the hypoepimeral area is rugulose and impunctate (Fig. 78B). Some L. swenki females can be distinguished from L. fedorense by the colour of the metasoma, which is sometimes red-orange in some individuals of L. swenki (Fig. 40), but in others the metasoma is brown (Fig. 37B). Specimens of L. swenki with a brown metasoma can be distinguished from L. fedorense by characters of the hypoepimeral area and pronotum described above.

Male L. swenki can be recognised by the combination of clypeus yellow, except for basolateral patch infused with brown (Fig. 6K); mandible elongate, reaching opposing mandible base (as in Fig. 6J); scape yellow, distinctly longer than F2; gena narrower than eye; mesepisternum polished, shiny, with distinct, but fine, punctures; and metapostnotum rugulose (as in Fig. 77C). They are most similar to L. fedorense and L. sopinci, which both have the gena wider than eye (Figs. 16, 38). Male L. fedorense also have the mesepisternum imbricate, dull with only shallow punctures. Male L. sopinci have the metapostnotum coarsely rugose (as in Fig. 77A).

Redescription. FEMALE. Length 5.7–6.0 mm. Head length 1.63–1.93 mm. Head width 1.73–1.94 mm. Wing length 5.0–5.2 mm. (n=7)

Colour. Head and mesosoma black. Antenna black, except ventral surface of flagellum reddish brown-orange. Tegula reddish brown-testaceous. Legs dark brown, except medio- and distitarsi reddish brown, inner protibial surface infused with reddish brown. Wing membrane hyaline, pale. Pterostigma pale yellow-testaceous. Metasomal terga orange-testaceous (sometimes brown with testaceous apical borders), except T5–T6 dark brown basally.

Structure. Head round (L/W ratio = 0.98–1.01). Clypeus 1/2–2/3 below suborbital line. Eyes divergent below (UOD:LOD = 1.07–1.19). Gena narrower than eye. Ocelli normal. Pronotal ridge sharply angled. Protibial spur with serrations subequal to width of malus. Inner metatibial spur pectinate, teeth 5, basal teeth longer than width of rachis. Propodeal lateral carina not reaching dorsal margin, oblique carina absent.

Surface sculpture. Supraclypeal area imbricate; punctures fine, contiguous (i Pubescence. Head and mesosoma with sparse plumose hairs. Frons and paraocular area with tomentum. Mesoscutum lateral margins with tomentum. Mesepisternum and metepisternum with tomentum beneath erect plumose hairs. Metafemoral scopa with dense plumose hairs. Propodeum with tomentum beneath erect hairs. Metasomal terga with moderately dense apical fimbriae, continuous on T3–T4. T1 with sparse, erect plumose hairs. Metasomal sterna with mostly simple scopal hairs.

MALE. Length 5.4–6.6 mm. Head length 1.54–1.80 mm. Head width 1.60–1.88 mm. Wing length 4.4–5.1 mm. (n=6)

Colour. Head and mesosoma black. Clypeus yellow, except basolateral testaceous-brown patch. Mandible yellow. Labrum yellow. Antenna yellow, except dorsal surface of flagellum brown, scape infused with brown dorsally. Pronotal lobe yellow. Legs yellow-testaceous, except coxae, trochanters brown, outer surface of metatibia infused with brown. Wing membrane hyaline, pale. Pterostigma pale yellow-testaceous. Metasomal terga orangetestaceous, except T4–T6 brown basally, T1 anterior surface infused with brown (or entirely black-brown with testaceous apical margins).

Structure. Head wide (L/W ratio = 0.96–0.99). Clypeus ½ below suborbital line. Mandible long, reaching opposing mandibular base. Flagellomeres, except F1, moderately elongate, F2 subequal to F1 and pedicel combined. Eyes convergent below (UOD:LOD = 1.17–1.24). Gena subequal to eye in width. Pronotal ridge sharply angled. Propodeal lateral carina not reaching dorsal margin.

Surface sculpture. Supraclypeal area imbricate; punctures fine, dense (i≤d). Ocellocular area polished, distinctly punctate. Gena and postgena smooth, weakly imbricate. Mesoscutum polished; punctures fine, dense laterally (i≤d), well-separated between parapsidal lines (i=1–1.5d). Mesepisternum polished, densely punctate. Metapostnotum carinulate-rugulose, apical margin imbricate. Propodeum imbricate-tessellate. Metasomal terga polished; punctures, close basally, obscure on apical impressed areas.

Pubescence. Head and mesosoma with sparse plumose hairs. Frons and paraocular area with relatively dense tomentum. Mesoscutum lateral margin with tomentum. Mesepisternum and metepisternum with appressed tomentum below erect plumose hairs. Propodeum largely bare, with scattered plumose hairs. Metasomal terga with apical fimbriae sparse. Metasomal sterna with sparse, plumose hairs (1–1.5 OD).


Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Hieracium @ AMNH_BEE (1)
Cucurbitaceae  Cucurbita @ AMNH_BEE (1)
Fabaceae  Dalea villosa @ AMNH_BEE (11); CUIC_ENT (1)
Linaceae  Linum rigidum @ AMNH_BEE (3); CUIC_ENT (1)
Nyctaginaceae  Mirabilis hirsuta @ AMNH_BEE (2)
Onagraceae  Oenothera @ AMNH_BEE (1)
_  Withheld @ BBSL (21)

go to Discover Life's Facebook group

Updated: 2024-06-17 03:20:27 gmt
Discover Life | Top
© Designed by The Polistes Corporation