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Lasioglossum callidum (Sandhouse, 1924)
Halictus (Chloralictus) callidus Sandhouse, 1924; Dialictus callidus (Sandhouse, 1924)

Life   Insecta   Hymenoptera   Apoidea   Halictidae   Lasioglossum
Subgenus: Dialictus

Lasioglossum callidum, Mid-Atlantic Phenology
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Lasioglossum callidum, Mid-Atlantic Phenology

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Lasioglossum callidum CFP MALE comp
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Lasioglossum callidum CFP MALE comp
Lasioglossum callidum, F, Back, Charles County, Maryland ---.
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Lasioglossum callidum, F, Back, Charles County, Maryland ---.

Lasioglossum callidum, F, Face, Charles County, Maryland ---.
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Lasioglossum callidum, F, Face, Charles County, Maryland ---.
Lasioglossum callidum, F, Side, Charles County, Maryland ---.
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Lasioglossum callidum, F, Side, Charles County, Maryland ---.

Lasioglossum callidum, female, non-square clypeus
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Lasioglossum callidum, female, non-square clypeus
Overview
Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 84-88


Holotype. ♂ USA, Virginia, East Falls Church, 20.vii, on Daucus carota (S.A. Rohwer); [NMNH: 26436]. Examined.


Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) callidum, p. 1112 (catalogue); Mitchell, 1960: Dialictus callidus ♂, p. 385, D. versatus ♀♂ (misdet.), p. 428 (redescription); Krombein, 1967: Lasioglossum (Dialictus) callidum, p. 462 (catalogue); Hurd, 1979: Dialictus callidus, p. 1965 (catalogue); Moure & Hurd, 1987: Dialictus callidus, p. 94 (catalogue).


Diagnosis. Both sexes of L. callidum and the south central USA species L. connexum (Cresson) can be recognised by their very wide protrochanters (Figs. 82E, 83D). Females of both species can be further distinguished by the strongly curved dorsal margin of the mandible at midlength (Fig. 82D) and the wide head with a weakly protruding clypeus (Fig. 82C). Males of both can be further recognised by the distinct punctation of the metasomal terga apically impressed areas. Both sexes of L. connexum, unlike L. callidum, have shining, polished and distinctly punctate mesepisternum and the ventral margin of the protrochanter is strongly convex. Lasioglossum callidum is also similar to L. versatum which lacks the curved mandible and wide protrochanter.


Description. FEMALE. Length 5.19–6.45 mm; head length 1.48–1.85 mm; head width 1.61–1.99 mm; forewing length 3.60–4.88 mm.


Colouration. Head and mesosoma green with golden reflections to bluish green. Clypeus with apical half blackish brown and basal half bronze. Antenna dark brown, flagellum with ventral surface dark brown to dull brownish yellow. Tegula reddish brown to translucent amber. Wing membrane subhyaline, venation and pterostigma amber. Legs brown, medio- and distitarsi reddish to yellowish brown. Metasoma dark brown, terga and sterna with apical margins translucent brownish yellow.


Pubescence. Dull white. Moderately dense. 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 moderately dense subappressed tomentum. Propodeum with dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with moderately dense, fine setae. T1 acarinarial fan sparse with wide dorsal opening, intermingled with erect hairs. T2–T3 with basolateral tomentum, forming narrow basal band on T3. T4 with tomentum partially obscuring much of disc. T2 apicolateral margin and T3–T4 apical margins with very sparse fringes.


Surface sculpture. Face imbricate. Clypeus polished, punctation dense (i≤d). Supraclypeal area with punctation moderately dense(i=1–2d). Lower paraocular area punctation dense (i≤d). Antennocular area punctation moderately dense (i<1.5d). Upper paraocular area and frons punctation contiguous. Ocellocular area punctation dense, minute (i≤d). Gena lineolate. Postgena imbricate. Mesoscutum weakly imbricate-tessellate, punctation moderately dense on medial portion of disc (i=1–1.5d), dense laterad of parapsidal lines (i≤1d) and reticulate on anterolateral portions. Mesoscutellum similar to mesoscutum, submedial punctation moderately dense (i=1–2d). Axilla densely punctate. Metanotum ruguloso-imbricate. Preλpisternum rugulose. Hypoepimeral area imbricate. Mesepisternum dorsal half ruguloso-imbricate, obscurely punctate, ventral half imbricate. Metepisternum with dorsal third rugoso-striate and ventral portions imbricate. Metapostnotum incompletely rugoso-striate, posterior margin imbricate. Propodeum with dorsolateral slope imbricate, lateral surface imbricate- tessellate, posterior surface imbricate. Metasomal terga polished except apical impressed areas weakly coriarious, punctation fine and close throughout (i=1–1.5d).


Structure. Head wide (length/width ratio = 0.90–0.93). Eyes weakly convergent below (UOD/LOD ratio = 1.19–1.22). Clypeus 1/3 below suborbital tangent, apicolateral margins strongly convergent. Antennal sockets somewhat close (IAD/OAD < 0.5). Frontal line carinate, ending 2 OD below median ocellus. IOD less than OOD. Gena narrower than eye. Procoxa unmodified. Protrochanter very broad, nearly as wide as long. Metapostnotum moderately elongate (MMR ratio = 1.29–1.36), posterior margin weakly rounded onto posterior surface. Propodeum with oblique carina weak, lateral carina divergent, not reaching dorsal margin.


MALE. Similar to female except for the usual secondary sexual characters and as follows. Length. 5.86– 6.71 mm; head length 1.61–1.92 mm; head width 1.61–1.97 mm; forewing length 3.84–4.58


Colouration. Flagellum with ventral surface brownish yellow. Tegula pale amber to reddish brown. Wing membrane subhyaline, venation and pterostigma reddish brown. Medio- and distitarsi pale brownish yellow. Pubescence. Clypeus, supraclypeal area, upper paraocular area, and lower frons with moderately dense tomentum partially obscuring surface. Lower paraocular area with dense tomentum obscuring surface. T2–T6 with sparse basolateral tomentum. S2–S5 apicolateral portions moderately dense hairs (i=1–1.5d).


Surface sculpture. Clypeal punctation dense (i

Structure. Head wide to round (length/width ratio = 0.96–1.00). Eyes strongly convergent below (UOD/ LOD ratio = 1.37–1.52). Clypeus 2/3 below suborbital tangent, apicolateral margins subparallel. Antennal sockets distant (IAD/OAD > 1.1). Frontal line carinate, ending 2 OD below median ocellus. Pedicel shorter than F1. F2 length 1.5X F1. F2–F10 elongate (length/width ratio = 1.43–1.62). Protrochanter 1.8 times longer than wide. Metapostnotum moderately elongate (MMR ratio = 1.12–1.25), posterior margin weakly angled onto posterior surface. Propodeum with oblique carina virtually absent, lateral carina weak, not reaching dorsal margin.


Terminalia. S7 with median lobe narrowly acuminate, sides weakly convergent, apex rounded (Fig. 83G). S8 with apicomedial margin weakly convex (Fig. 83G). Genitalia as in Fig. 83E–F. Gonobase with ventral arms thick, narrowly separated. Gonostylus small, dorsal setae elongate. Retrorse lobes elongate, narrow, apically recurved.


Range. Ontario south to Georgia, west to Colorado


Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.


Lasioglossum (Dialictus) callidum (Sandhouse)

Halictus (Chloralictus) callidus Sandhouse, 1924: 34. ♂.

Holotype. ♂ USA, Virginia, East Falls Church, 20.vii, on Daucus carota (S.A. Rohwer); [NMNH: 26436]. Examined.

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) callidum, p. 1112 (catalogue); Mitchell, 1960: Dialictus callidus ♂, p. 385, D. versatus ♀♂ (misdet.), p. 428 (redescription); Krombein, 1967: Lasioglossum (Dialictus) callidum, p. 462 (catalogue); Hurd, 1979: Dialictus callidus, p. 1965 (catalogue); Moure & Hurd, 1987: Dialictus callidus, p. 94 (catalogue); Gibbs, 2010b: Lasioglossum (Dialictus) callidum ♀♂, p. 84 (redescription, key).

Diagnosis. Female L. callidum can be recognised by the following diagnostic combination: mandible with strongly curved dorsal margin (Fig. 19B), protrochanter wide (Fig. 18B), and mesepisternum rugulose. They share the mandible and protrochanter characters with L. connexum (Cresson) but this species has the mesepisternum polished and distinctly punctate. Female L. callidum are similar to L. versatum and L. trigeminum, both of which lack the mandible and protrochanter characters.

Male L. callidum can be recognised by the following diagnostic combination: protrochanter wide (Fig. 34B), mesepisternum rugulose, and metasomal terga with distinct punctures on the apical impressed areas. They are similar to L. connexum and L. versatum. The former species has the mesepisternum punctate and the latter species has the protrochanter narrow.

Range. Ontario south to Georgia, west to Colorado. USA: AL, CO, GA, MD, MO, MS, NE, NC, NY, SC, TN, VA, WI. CANADA: ON.

DNA Barcode. Available. Multiple sequences. DNA barcodes are identical to those of L. versatum.

Comments. Common.

Mitchell (1960) mistook this species in part for L. versatum (see Gibbs 2010b).


Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
A. newhart  623 @ JRYB__SHEN (1)
Amaryllidaceae  Allium @ AMNH_BEE (2)
Asteraceae  Senecio balsamea @ AMNH_BEE (6)

Taraxacum campylodes @ AMNH_BEE (1)
Brassicaceae  Lesquerella filiformis @ AMNH_BEE (1)
Ericaceae  Rhododendron maximum @ AMNH_BEE (1)
Fabaceae  Amorpha fruticosa @ AMNH_BEE (3)
J. rykken  1029 @ JRYB__SHEN (1)

1031 @ JRYB__SHEN (1)

1037 @ JRYB__SHEN (1)

727 @ JRYB__SHEN (1)
K. kingsley  1059 @ JRYB__SHEN (1)
Ml. epps  773 @ JRYB__SHEN (1)
N. rice  1031 @ JRYB__SHEN (1)
Plantaginaceae  Penstemon hirsutus @ AMNH_BEE (2)
Rosaceae  Fragaria virginiana @ AMNH_BEE (1)

Prunus virginiana @ AMNH_BEE (1)

Rosa rubiginosa @ AMNH_BEE (1)

Rosa @ AMNH_BEE (1)

Rubus flagellaris @ AMNH_BEE (1)
_  apple @ NLA (2)

blueberry @ NLA (10)

caneberry @ NLA (21)

cucurbit @ NLA (172)

meadow @ NLA (2)

pond edge @ NLA (1)

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Updated: 2019-01-21 11:56:15 gmt
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