Lasioglossum (Dialictus) nymphaearum (Robertson)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216: 149-150

publication ID

http://doi.org/ 10.5281/zenodo.1049595

publication LSID

lsid:zoobank.org:pub:B5AF6DF4-D3A7-4942-A94F-CC051D8074CF

persistent identifier

http://treatment.plazi.org/id/9A5987DB-A782-FF22-0A97-8FC2FE3907CE

treatment provided by

Plazi

scientific name

Lasioglossum (Dialictus) nymphaearum (Robertson)
status

 

Lasioglossum (Dialictus) nymphaearum (Robertson)  

Halictus palustris Robertson, 1890: 317   . Ƥ 3. (primary junior homonym of Halictus palustris Morawitz, 1876   )

Syntypes. [ ANSP]. Examined.

Halictus nymphaearum Robertson, 1895: 117   (replacement name for H. palustris Robertson   ). Halictus paludicola Dalla Torre, 1896: 75   (replacement name for H. palustris Robertson   ). Halictus oceanicus Cockerell, 1916: 11   . Ƥ.

Holotype. Ƥ USA, New Jersey, Ocean Grove, 12.vii. 1893, [ NMNH: 27769]. Examined. Dialictus advertus Mitchell, 1960: 433   . 3.

Holotype. 3 USA, Massachusetts, Reading, 23.vii. 1933 (R. Dow); [ NCSU]. Examined.

Taxonomy. Robertson, 1902 b: Chloralictus nymphaearum   , p. 248 (key); Viereck, 1916: Halictus (Chloralictus) nymphaearum   , p. 706; Michener, 1951: Lasioglossum (Chloralictus) nymphaearum   , p. 1115 (catalogue, synonymy); Mitchell, 1960: Dialictus nymphaearum   Ƥ 3, p. 407 (redescription); Krombein, 1967: Lasioglossum (Dialictus) advertum   , p. 462, L. (D.) nymphaearum   , p. 465 (catalogue); Hurd, 1979: Dialictus advertus   , p. 1963, D. nymphaearum   , p. 1969 (catalogue); Moure & Hurd, 1987: Dialictus advertus   , p. 102, D. nymphaearum   , p. 116 (catalogue); Gibbs, 2010 b: Lasioglossum (Dialictus) oceanicum   Ƥ 3, p. 220 (redescription, key, synonymy).

Diagnosis. Female L. nymphaearum   can be recognised by the following diagnostic combination: size large (6.0– 7.5 mm), hypostomal carina distally reflexed, mesoscutal punctures coarse (i= 1–1.5 d), metapostnotum with posterior dorsal margin carinate, and apical impressed areas of metasomal terga densely punctate

Male L. nymphaearum   are similar to females but have hypostomal carina normal and transverse carina bordering metapostnotum dorsal surface distinctly bowed posteriorly. Male L. nymphaearum   can be further distinguished by face below emargination with dense tomentum, head moderately elongate (length/width ratio = 0.97 –1.00), and flagellomeres short (length/width ratio = 1.13–1.33). They are most similar to L. albipenne   , which lacks distinct punctures on the tegula and have a longer head (length/width ratio = 0.99–1.08).

Range. Nova Scotia west to Ontario, Minnesota, south to North Carolina. USA: CT, IL, IN, KS, MA, MD, MI, MN, MO, NC, NJ, NY, OK, PA, RI, TX, VA, WI, WV. CANADA: ON.

DNA Barcode. Available. Multiple sequences.

Comments. Common.

The syntype series of Halictus palustris   includes both L. nymphaearum   as it is usually applied (e. g. Mitchell 1960) and L. albipenne   . An invalid lectotype for Halictus palustris   at ANSP (specimen number 4252) belongs to the latter species. Gibbs (2010 b) considered this lectotype to be valid and as a result made Halictus nymphaearum   a junior subjective synonym of L. albipenne   . Gibbs (2010 b) then applied the name L. oceanicum   for the species traditionally called L. nymphaearum   . Since it is now clear the lectotype for Halictus palustris   at the ANSP is invalid (no published designation can be found), the standard usage of L. nymphaearum   is applied herein to maintain nomenclatural stability. It is clear from Robertson’s (1890) original description that he did not mean for Halictus palustris   to apply to L. albipenne   , which he describes in the same paper. The syntype series at ANSP includes specimens of L. nymphaearum   as currently (and historically) applied. One of these will be designated as the lectotype to fix the name to a single species and maintain standard usage of L. nymphaearum   .

ANSP

Academy of Natural Sciences of Philadelphia

NMNH

Smithsonian Institution, National Museum of Natural History

NCSU

North Carolina State University Insect Museum

DNA

Department of Natural Resources, Environment, The Arts and Sport

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Halictidae

Genus

Lasioglossum

Loc

Lasioglossum (Dialictus) nymphaearum (Robertson)

Gibbs, Jason 2011
2011
Loc

Halictus nymphaearum

Cockerell 1916: 11
Dalla 1896: 75
Robertson 1895: 117
1895
Loc

Halictus palustris

Robertson 1890: 317
1890