Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini)
Author
Gibbs, Jason
text
Zootaxa
2011
2011-10-28
3073
1
216
journal article
31531
10.5281/zenodo.1049595
1a985cc7-af57-45e9-a988-c3beda3c15b4
1175-5326
1049595
B5AF6DF4-D3A7-4942-A94F-CC051D8074CF
Lasioglossum
(
Dialictus
)
platyparium
(Robertson)
Halictus platyparius
Robertson, 1895
: 117
. Ƥ.
Lectotype
.
Ƥ
USA
, Illinois, Macoupin Co. Carlinville,
18.v.1887
(C. Robertson); [INHS: 3995] by W. E. LaBerge (in
Webb 1980
). Examined.
Taxonomy.
Robertson, 1901
:
Paralictus platyparius
, p. 229 (generic description);
Michener, 1951
:
Lasioglossum
(
Paralictus
)
platyparium
, p. 1119 (catalogue);
Mitchell, 1960
:
Paralictus platyparius
Ƥ3, p. 448 (redescription);
Krombein, 1967
:
Lasioglossum
(
Paralictus
)
platyparium
, p. 467 (catalogue);
Paralictus platyparius
, p. 1974 (catalogue);
Moure & Hurd, 1987
:
Paralictus platyparius
, p. 143 (catalogue);
Gibbs, 2010b
:
Lasioglossum
(
Dialictus
)
platyparium
Ƥ3, p. 261 (redescription, key).
Diagnosis.
Female
L
.
platyparium
can be recognised by the following diagnostic combination: scopa absent; gena wider than eye; mandible large, converging to point only near apex, distinct preapical tooth absent; labrum with distinct basal tubercle, apical process flat, dorsal keel absent (
Fig. 6
B); and metapostnotum rugoso-carinulate. They are similar to
L
.
cephalotes
and
L
.
rozeni
. Female
L. rozeni
have a narrow mandible that is evenly convergent along its entire length and lacks a distinct basal tubercle on the labrum. Female
L
.
cephalotes
lack a distinct basal tubercle on the labrum and have a smooth metapostnotum without evident rugae.
Male
L
.
platyparium
can be recognised by head wide (length/width ratio = 0.95–0.96), dorsolateral angle of pronotum acute, pronotal collar weak, and mesepisternum rugulose.
Range.
Ontario south to
Georgia
, Louisiana and west to Minnesota.
USA
: DC, GA,
IL
, KS, LA, MD, MN, MO, NC, PA, WV, WI.
CANADA
: ON.
DNA Barcode.
Available. Multiple sequences.
Comments.
Uncommon.
Lasioglossum platyparium
is presumed to be a social parasite of nest-building
Dialictus
. It is perhaps the most commonly collected of the parasitic
L.
(
Dialictus
) but its host species remains unknown.