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Lasioglossum comagenense (Knerer and Atwood, 1964)
Evylaeus comagenensis Knerer and Atwood, 1964

Life   Insecta   Hymenoptera   Apoidea   Halictidae   Lasioglossum
Subgenus: Sphecodogastra

Lasioglossum comagenense FEM mm X f
© Copyright Laurence Packer 2014 · 7
Lasioglossum comagenense FEM mm X f

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Lasioglossum comagenense MALE mm x ZS PMax
© Copyright Laurence Packer 2014 · 7
Lasioglossum comagenense MALE mm x ZS PMax
Identification
This species relatively large, 8-8.5mm, propodeum with a prominent v where the raised lines that define the lateral edges of the rear face of the propodeum end, almost at the rim of the triangle. Triangle with complete striations, that are narrow and pilosum -like, cheeks very wide, gray appressed thick hairs for a narrow strip on the anterior edge of the metanotum, but broaden out in the center to about one quarter to one third of the segment.

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. comagenense can be recognised by the combination of head short (L/W ratio = 0.93–0.96) (Fig. 43C); mesepisternum finely rugulose (Fig. 76D); inner metatibial spur pectinate-denticulate, teeth shorter than width of rachis (Fig. 5N); propodeum with lateral carina distinct, extending to dorsal margin, oblique carina strong (Fig. 79D). In the east, L. comagenense is most similar to L. boreale, L. quebecense, and L. seillean. Lasioglossum quebecense and L. seillean both have longer heads (L/W ratio = 1.00–1.04) (Figs. 43F, 43G) and long teeth on the inner metatibial spur, distinctly exceeding the width of the rachis (Figs. 5O, 5P). The female of L. boreale has a longer head (L/W ratio = 0.98–1.00) (Fig. 43B) and fine propodeal carinae (Fig. 79C).

Male L. comagenense can be recognised by the combination of clypeus with yellow on distal half (Fig. 44C); mandible short, not extending much beyond opposing clypeal angle; F2 long subequal to scape; propodeal lateral carina strong; metasomal sterna nearly bare, hairs present but very short; S2–S3 with sparse punctures (Fig. 88A); and basitarsi bright yellow (Fig. 57). The unique shape of the retrorse lobe (Fig. 87B), which is distinctively recurved apically, is the most reliable character for distinguishing L. comagenense males from L. boreale, L. quebecense, and L. seillean (Figs. 87A, 87C, 87D).

Redescription. FEMALE. Length 6.1–7.2 mm. Head length 1.76–2.00 mm. Head width 1.84–2.10 mm. Wing length 5.1–5.7 mm. (n=6)

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

Structure. Head wide (L/W ratio = 0.93–0.96). Clypeus ¾ below suborbital line. Eyes convergent below (UOD:LOD = 1.06–1.11). Gena subequal to eye width. Ocelli normal. Pronotum smoothly rounded. Protibial spur with apical serrations as long as width of malus. Inner metatibial spur pectinate, teeth 4–6, basal teeth equal to width of rachis. Propodeal lateral carina reaching dorsal margin, oblique carina high, separating dorsolateral slope from posterior surface.

Surface sculpture. Supraclypeal area weakly polished medially, punctures sparse (i=1–2d). Gena lineolate, postgena smoother. Mesoscutum imbricate, dull; punctures dense (i≤d), except medially (i=1–1.5d). Mesepisternum finely rugulose, smoother ventrally. Metapostnotum carinate-rugose. Propodeum imbricatetessellate. Metasomal terga weakly coriarious, T1 polished; punctures dense, sparser posteromedially, T2 apical impressed area impunctate medially.

Pubescence. Head and mesosoma with sparse plumose hairs. Metafemoral scopa with dense plumose hairs. Metasomal terga with relatively sparse, medially-interrupted apical fimbriae. T1 with sparse, erect plumose hairs. T2–T4 basally with sparse, tomentum. Metasomal sterna with plumose scopa.

MALE. Length 6.4–7.8 mm. Head length 1.82–2.05 mm. Head width 1.77–1.96 mm. Wing length 4.8–5.4 mm. (n=6)

Colour. Head and mesosoma black. Clypeus yellow apical half. Mandible brown. Labrum yellow. Antenna black, except ventral surface of flagellum orange, less so on F10–F11. Legs dark brown, except tarsi, bases and apices of tibiae yellow, anterior surface of protibia yellow-testaceous, sometimes anterior surface of mesotibia and ventral surface of metatibia yellow-testaceous. Wing membrane hyaline. Pterostigma orange. Metasomal terga dark brown, pale brown apically.

Structure. Head long (L/W ratio = 1.01–1.04). Mandible short, reaching opposing clypeal angle. Flagellomeres, except F1 elongate, F2 longer than F1 and pedicel combined, subequal to scape. Eyes strongly convergent below (UOD:LOD = 1.27–1.39). Gena narrower than eye. Pronotum smoothly rounded. Propodeal lateral carina reaching dorsolateral slope, contiguous with strong oblique carina.

Surface sculpture. Supraclypeal area imbricate, with relatively dense punctures (≤d). Gena lineolate. Mesoscutum imbricate, reticulate anterolaterally; punctures dense but clearly separated medially (i=1–1.5d). Mesepisternum rugulose, weakly so ventrally. Metapostnotum anastomosingly rugose. Propodeum rugulose, posterior surface rugose. Metasomal terga polished; punctures deep, close basally. T2–T6 apical impressed areas impunctate.

Pubescence. Head and mesosoma with sparse plumose hairs. Face below antennal sockets with dense tomentum, lower paraocular area obscured, supraclypeal area and clypeus partially obscured, clypeus bare on distal half. Propodeum largely bare, with scattered plumose hairs. Metasomal terga nearly bare, without apical fimbriae. T2 with narrow, basolateral patch of tomentum. Metasomal sterna nearly bare, with sparse, short, plumose hairs (< 1 OD).


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Updated: 2024-03-29 08:42:42 gmt
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