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Lasioglossum oceanicum (Cockerell, 1916)
Halictus oceanicus Cockerell, 1916; Dialictus advertus Mitchell, 1960; Lasioglossum (Dialictus) advertum (Mitchell, 1960); Lasioglossum (Dialictus) nymphaearum (Robertson, 1895), sensu auct

Life   Insecta   Hymenoptera   Apoidea   Halictidae   Lasioglossum
Subgenus: Dialictus

Lasioglossum oceanicum FEM CFP-
© Copyright Laurence Packer 2014 · 7
Lasioglossum oceanicum FEM CFP-

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Lasioglossum oceanicum MALE CFP comp-
© Copyright Laurence Packer 2014 · 7
Lasioglossum oceanicum MALE CFP comp-
Lasioglossum oceanicum, female, face
Ellen Bulger · 1
Lasioglossum oceanicum, female, face

Lasioglossum oceanicum, female face
Ellen Bulger · 1
Lasioglossum oceanicum, female face
Lasioglossum oceanicum, female, profile
Ellen Bulger · 1
Lasioglossum oceanicum, female, profile

Lasioglossum oceanicum, female, propodeum rear face
Ellen Bulger · 1
Lasioglossum oceanicum, female, propodeum rear face
Lasioglossum oceanicum, female, propodeum
Ellen Bulger · 1
Lasioglossum oceanicum, female, propodeum

Lasioglossum oceanicum, female, propodeum
Ellen Bulger · 1
Lasioglossum oceanicum, female, propodeum
Lasioglossum oceanicum, female, wing
Ellen Bulger · 1
Lasioglossum oceanicum, female, wing

Lasioglossum oceanicum, female, fimbriae on T2
Ellen Bulger · 1
Lasioglossum oceanicum, female, fimbriae on T2
Lasioglossum oceanicum, female, abdomen
Ellen Bulger · 1
Lasioglossum oceanicum, female, abdomen

Lasioglossum oceanicum, female, dorsal habitus
Ellen Bulger · 1
Lasioglossum oceanicum, female, dorsal habitus
Overview
Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 223-228


Halictus oceanicus Cockerell, 1916: 11. ♀. Holotype. ♀ USA, New Jersey, Ocean Grove, 12.vii.1893, [NMNH: 27769]. Examined. Dialictus advertus Mitchell, 1960: 433. ♂. [new synonymy] Holotype. ♂ USA, Massachusetts, Reading, 23.vii.1933 (R. Dow); [NCSU]. Examined.


Taxonomy. Robertson, 1902: 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 ♀♂, p. 407 (redescription); Krombein, 1967: Lasioglossum (Dialictus) advertum, p. 462, L. (D.) nymphaearum, p. 465 (catalogue); Hurd, 1979: Dialictus advertus, p. 1963, D. nymphaearus, p. 1969 (catalogue); Moure & Hurd, 1987: Dialictus advertus, p. 102, D. nymphaearus, p. 116 (catalogue).


Diagnosis. Females of L. oceanicum can be recognised by the diagnostic combination of their large size (6.0–7.5 mm), distally reflexed hypostomal carinae, coarse mesoscutal punctation (i=1–1.5d), strongly punctate ovoid tegula, strong and uninterrupted transverse carina delimiting dorsal and posterior surfaces of propodeum (Fig. 163D), and densely punctate apical impressed areas of metasomal terga. They are most similar to L. cressonii, L. albipenne, and L. bruneri which all lack strong punctures on the tegula and have medially interrupted transverse carinae on the propodeum.


Males of L. oceanicum are similar to females but have the hypostomal carina normal and the transverse carina of the propodeum distinctly bowed posteriorly (Fig. 164D).


Males can be further distinguished by the dense facial tomentum that obscures the surface below the level of the eye emargination, moderately elongate head (length/width ratio = 0.97–1.00), and short flagellomeres (length/width ratio = 1.13–1.33). They are most similar to L. albipenne which lack distinct punctures on the tegula and have a longer head (length/width ratio = 0.99–1.08).


Redescription. FEMALE. Length 5.98–7.45 mm; head length 1.80–1.99 mm; head width 1.87–2.06 mm; forewing length 4.94–5.49 mm


Colouration. Head and mesosoma bluish green. Clypeus with apical half blackish brown. Antenna dark brown, flagellum with ventral surface reddish brown. Tegula dark reddish brown. Wing membrane subhyaline, venation and pterostigma brownish yellow. Legs brown, medio- and distitarsi reddish brown. Metasomal terga brown, faintly metallic blue, terga and sterna with apical margins translucent brownish yellow.


Pubescence. Dull white. Moderately sparse. 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 without 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 complete. T2 basolaterally and T3–T4 entirely with appressed tomentum partially obscuring disc. T2 apicolateral and T3–T4 apical margins with weak fringes.


Surface sculpture. Face imbricate, punctation coarse. Clypeus polished, punctation unevenly spaced (i=1– 3d). Supraclypeal area with punctation dense (i≤d). Lower paraocular area punctation dense (i

Structure. Head wide (length/width ratio = 0.95–0.96). Eyes convergent below (UOD/LOD ratio = 1.25– 1.28). Clypeus ½ below suborbital tangent, apicolateral margins convergent. Antennal sockets close (IAD/ OAD < 0.5). Frontal line carinate, ending 2 OD below median ocellus. Gena narrower than eye. Hypostomal carinae parallel, reflexed distally, visible from lateral view. Inner metatibial spur pectinate with 4–5 teeth. Metapostnotum truncate (MMR ratio = 1.33–1.50). Propodeum with oblique carina strong, lateral carina complete, dorsal and posterior surfaces delimited by strong transverse carina.


MALE. Similar to female except for the usual secondary sexual characters and as follows. Length. 5.67– 6.83 mm; head length 1.63–1.80 mm; head width 1.68–1.80 mm; forewing length 4.45–4.88 mm


Colouration. Head and mesosoma more bluish. Mandible midlength with yellow-orange. Flagellum with ventral surface orange. Tarsi yellow to brownish yellow. Metasoma less metallic.


Pubescence. Face with dense white tomentum below level of eye emargination, lower paraocular area completely obscured, clypeus, supraclypeal area, upper paraocular area and frons partially obscured. S2–S3 apical halves and S4 apicolateral portions with subappressed plumose hairs (1–1.5 OD).


Surface sculpture. Metepisternum rugose-striate. Propodeum with lateral surface rugose, posterior surface rugulose. Metasomal terga with deep punctures, apical impressed areas impunctate except along anterior margin.


Structure. Head moderately wide to round (length/width ratio = 0.97–1.00). Eyes strongly convergent below (UOD/LOD ratio = 1.52–1.57). Antennal sockets distant (IAD/OAD > 1.2). Frontal line carinate, ending 2 OD below median ocellus. Pedicel shorter than F1. F2 length 1.30–1.58X F1. F2–F10 short (length/ width ratio = 1.13–1.33). Hypostomal carina not reflexed. Metapostnotum truncate (MMR ratio = 1.31–1.42), posterior margin strongly carinate.


Terminalia. S7 with median lobe strongly clavate, apex rounded (Fig. 164E). S8 with apicomedial margin weakly convex (Fig. 164E). Genitalia as in Fig. 164E–F. Gonobase with ventral arms widely separated. Gonostylus elongate, dorsal setae elongate. Retrorse lobe elongate, weakly attenuated, reflexed apically.


Range. Nova Scotia west to Ontario, Minnesota, south to North Carolina (Fig. 165).


Additional material examined. CANADA: ONTARIO: 1♀ Caledon, Gschwendtner property, N43°48.89΄ W079°58.61΄, 7.viii.2003 (J. Grixti); 1♀ Norfolk Co., Pterophylla Plant Nursery, N43°38.404 W080°34.379΄, 13–22.viii.2006 (P.J. Carson); USA: ILLINOIS: 1♀ Kanakee Co., Hooper Br., 2.vii.2003 (R.P. Jean); INDIANA: 1♀ Newton Co., Conrad, 17.vii.2003 (R.P. Jean); MARYLAND: 1♀ Pr. George’s Co., N39.0459 W076.7963, 1–2.viii.2002 (H.W. Ikerd); MASSACHUSETTS: 1♂ Middlesex Co., 2.5 mi NE of E. Pepperell, 5.viii.2006 (M.F. Veit); MICHIGAN: 2♀♀ Allegan Co., N42.5538 W086.0437, 28.viii.2003 (S.W. Droege); [PCYU]; 1♂ Barry Co., Yankee Springs Game Area, 15.vii.1960 (G.C. Eickwort); [CUIC]; 1♀Tuscola Co., Silverwood Twp., 18.vii.2008 (J.K. Tuell et al.); [ARC]; MINNESOTA: 1♀ Sher Co., Zimmerman, Sherburne NWR, 10.vii.2001 (S. Droege); MISSOURI: 1♀ Newton Co., Diamond Grove Pr., 3.v.2003 (Arduser); [PCYU]; NEW YORK: 1♀ Suffolk Co., Gardiners Is., 20.vii.2007 (R.G. Goelet); [AMNH]; NORTH CAROLINA: 1♂ Blue Ridge Parkway, near Jefferson, N36.34234 W081.37465, 13.viii.2006 (J. Gibbs); RHODE ISLAND: 1♂ Newport Co., N41.4969 W071.3678, 22.vii.2005 (P. Ostenton); WEST VIRGINIA: 1♀ Hampshire Co., N39.3348 W078.458, 20.ix. (S.W. Droege); [PCYU]; WISCONSIN: 1♀ Dane Co., Hauser Rd. (R.A. Henderson); [IRCW].


Floral records. ANACARDIACEAE: Rhus, APIACEAE: Daucus, Taenidia, ASCLEPIADACEAE: Asclepias, ASTERACEAE: Anaphalis, Antennaria, Chrysanthemum, Hieracium, Krigia, Leontodon, Solidago, Taraxacum, BRASSICACEAE: Barbarea, Berteroa, CORNACEAE: Cornus, EUPHORBIACEAE: Euphorbia, FABACEAE: Lotus, Medicago, Melilotus officinalis, Trifolium, HYDRANGEACEAE: Hydrangea, IRIDACEAE: Sisyrinchium, LAMIACEAE: Pycnanthemum, LILIACEAE: Camassia, LYTHRACEAE: Lythrum, NELUMBONACEAE: Nelumbo, NYMPHAEACEAE: Castalia, POLYGONACEAE: Fagopyrum, PONTEDERIACEAE: Pontederia, RANUNCULACEAE: Ranunculus, ROSACEAE: Crataegus, Fragaria, Malus, Potentilla, Prunus, Rubus, SALICACEAE: Salix, VERBENACEAE: Lippia.


Biology. Bohart, 1941: (stylopization); Delfinado & Baker, 1976: (mite association).


Comments. Common. The species redescribed here as L. oceanicum has typically been referred to as L. nymphaearum. The latter name is a replacement for Halictus palustris Robertson which is invalid due to primary homonymy with H. palustris Morawitz (1876). The lectotype specimen for H. palustris Robertson belongs to the species L. albipenne which was originally described in the same paper (Robertson 1902). This is unfortunate because it is clear from the original description and from subsequent studies that L. nymphaearum has always been used to mean the species redescribed here as L. oceanicum. The name L. oceanicum, previously considered a junior synonym of L. nymphaearum, is resurrected. The holotype specimen of Dialictus advertus seems to be an oddly sculptured L. oceanicum reminiscent of other anomalous Dialictus specimens (e.g. Knerer & Atwood 1964; Hopwood 2007; Gibbs 2010). The ventral portion of the mesepisternum has distinct punctures and the propodeum lacks the well-defined transverse carina. In all other respects it matches a typical L. oceanicum including the diagnostic punctate ovoid tegula.

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Adoxaceae  Viburnum dentatum @ UCMS_ENT (4)

Viburnum @ AMNH_BEE (3)
Alismataceae  Sagittaria latifolia @ AMNH_BEE (1)
Apiaceae  Daucus carota @ UCMS_ENT (16)
Apocynaceae  Asclepias sp @ UCMS_ENT (32)

Asclepias syriaca @ UCMS_ENT (2)
Asteraceae  Achillea millefolium @ UCMS_ENT (9)

Aster @ AMNH_BEE (8)

Chrysanthemum leucanthemum @ UCMS_ENT (10)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cichorium [duplicate] @ UCMS_ENT (1)

Cirsium sp @ UCMS_ENT (7)

Cirsium @ UCMS_ENT (1)

Erigeron @ UCMS_ENT (1)

Hieracium caespitosum @ UCMS_ENT (1)

Hieracium sp @ UCMS_ENT (3)

Hieracium @ UCMS_ENT (1)

Leucanthemum vulgare @ UCMS_ENT (29); AMNH_BEE (4)

Pluchea odorata @ UCMS_ENT (11)

Solidago rugosa @ UCMS_ENT (2)

Solidago sempervirens @ UCMS_ENT (1)

Solidago tenuifolia @ UCMS_ENT (8)

Solidago @ AMNH_BEE (1)

Tanacetum vulgare @ UCMS_ENT (2)

Taraxacum campylodes @ UCMS_ENT (6)
Brassicaceae  Barbarea vulgaris @ CUIC_ENT (2); UCMS_ENT (3)

Brassica @ UCMS_ENT (1)

Lepidium campestre @ CUIC_ENT (4)

Raphanus raphanistrum @ UCMS_ENT (4)

Sisymbrium officinale @ UCMS_ENT (8)
Caryophyllaceae  Lychnis alba @ UCMS_ENT (1)

Stellaria graminea @ UCMS_ENT (3)
Clethraceae  Clethra alnifolia @ UCMS_ENT (2)
Convolvulaceae  Convolvulus sepium @ UCMS_ENT (2)
Ericaceae  Calluna vulgaris @ UCMS_ENT (3)

Vaccinium corymbosum @ AMNH_BEE (4)
Fabaceae  Baptisia tinctoria @ AMNH_BEE (1)

Lathyrus japonicus @ UCMS_ENT (2)

Melilotus officinalis @ UCMS_ENT (3)
Lamiaceae  Lycopus sp @ UCMS_ENT (6)

Lycopus virginicus @ UCMS_ENT (2)

Mentha piperita @ UCMS_ENT (2)

Mentha sp @ UCMS_ENT (1)

Nepeta cataria @ UCMS_ENT (1)

Teucrium canadense @ UCMS_ENT (1)
Oleaceae  Ligustrum vulgare @ UCMS_ENT (3)

Ligustrum @ UCMS_ENT (1)
Phytolaccaceae  Phytolacca americana @ UCMS_ENT (1)
Plumbaginaceae  Limonium carolinianum @ UCMS_ENT (4)
Polemoniaceae  Phlox sp @ UCMS_ENT (2)
Polygonaceae  Persicaria bungeana @ UCMS_ENT (2)

Persicaria hydropiper @ UCMS_ENT (2)

Polygonum cuspidatum @ UCMS_ENT (1)

Polygonum sp @ UCMS_ENT (4)
Primulaceae  Lysimachia quadrifolia @ AMNH_BEE (1)
Ranunculaceae  Ranunculus acris @ UCMS_ENT (1)

Ranunculus bulbosus @ UCMS_ENT (3)

Ranunculus septentrionalis @ AMNH_BEE (2)

Ranunculus sp @ UCMS_ENT (3)

Ranunculus @ UCMS_ENT (1)
Rosaceae  Malus @ AMNH_BEE (6)

Photinia pyrifolia @ UCMS_ENT (1)

Prunus sp @ UCMS_ENT (2)

Rosa rugosa @ UCMS_ENT (17)

Rubus flagellaris @ AMNH_BEE (4)

Rubus sp @ UCMS_ENT (3)

Rubus @ AMNH_BEE (1); CUIC_ENT (1)
Salicaceae  Salix @ AMNH_BEE (2)
Scrophulariaceae  Verbascum thapsus @ AMNH_BEE (1)
Solanaceae  Datura stramonium @ UCMS_ENT (1)

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