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© Copyright Laurence Packer 2014
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Lasioglossum callidum CFP MALE comp |
© Copyright source/photographer
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Lasioglossum callidum, F, Back, Charles County, Maryland |
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© Copyright source/photographer
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Lasioglossum callidum, F, Face, Charles County, Maryland |
© Copyright source/photographer
· 5
Lasioglossum callidum, F, Side, Charles County, Maryland |
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Deana Crumbling · 1
Lasioglossum callidum, female, non-square clypeus |
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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. Pre�pisternum 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).
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Identification | |
Extracted from: Sandhouse G. A. New North American Species of Bees Belonging to the Genus Halictus (Chloralictus). No. 2532 - Proceedings U.S. National Museum. Vol. 65, Art. 19.
In this excerpt, Lasioglossum callidum is known as the now synonymized Halictus callidus.
Male.—About 5.5 mm. long; head and thorax golden green; abdomen black; pubescence pure white. Facial quadrangle longer than
broad; orbits converging slightly below; face clothed with very dense
pubescence, closely punctured; antennae dark, second and third joints of equal length; flagellum testaceous beneath; mandibles pale reddish. Thorax with dense, short pubescence; mesothorax opaque,
microscopically tessellate, closely punctured, punctures laterally
contiguous, on the disk the punctures are a little more than the
diameter of a puncture apart; punctation of the scutellum similar
to that of the mesothorax; disk of propodeum crescentic, shining, plicate, the plicae reaching the broad, low posterior rim; at the
sides the plicae extend over the margin on to the lateral sides of
the propodeum; mesopleurae with coarse, shallow punctures; trun- cation sharply defined laterally; tegulae pale testaceous, impunctate.
Abdomen ovate, with rather close, short hairs; apical margins of seg- ments with faint, transverse lineolations, testaceous; segments 1-3
closely punctured: segments 4-5 with piliferous punctures only.
Wings clear; anterior wing 4.5 mm. long; stigma and nervures very
pale testaceous; subcostal nervure very dark; basal nervure very
strongly bent; second submarginal cell higher than broad; the first recurrent nervure joining the second transverso-cubital ; third submarginal broad, contracted above, about one and one-half times as long as the second on the marginal. Legs black; knees and tips of tibae and tarsi yellow.
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Updated: 2024-04-19 09:10:47 gmt
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