Lasioglossum (Dialictus) tarponense (Mitchell)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 191-194

Lasioglossum (Dialictus) tarponense (Mitchell)

( Figures 207–211 )

Dialictus tarponensis Mitchell, 1960: 423 . Ƥ.

Holotype. Ƥ USA, Florida, Tarpon Springs, 21.iii.1950 (H.K. Townes); [ NCSU]. Examined. Dialictus placidensis Mitchell, 1960: 441 . 3.

Holotype. 3 USA, Florida, Lake Placid, 27.xii.1956 (K.V. Krombein); [ NCSU]. Examined.

Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) placidense , p. 466, L. (D.) tarponense , p. 466 (catalogue); Moure and Hurd, 1987: Dialictus placidensis , p. 124, D. tarponensis , p. 133 (catalogue).

Diagnosis. Both sexes of L. tarponense can be recognised by the following diagnostic combination: legs nearly entirely yellowish orange ( Fig. 209 ), clypeus yellowish orange ( Figs. 207 B, 209B), and mesepisternum punctate.

Redescription. FEMALE. Length 4.41 mm; head length 1.32 mm; head width 1.27 mm; forewing length 3.45 mm.

Colouration. Head and mesosoma pale green to pale blue. Labrum and mandible yellowish orange. Clypeus with apical half yellowish orange. Antenna dark brown, flagellum with ventral surface reddish brown. Pronotal lobe brownish yellow. Tegula amber. Wing membrane subhyaline, venation and pterostigma brown. Legs yellowish orange. Metasoma reddish brown, terga and sterna with apical margins translucent brownish yellow.

Pubescence. Dull white. Moderately sparse. Head and mesosoma with moderately sparse woolly hairs (1–2 OD), longest on genal beard, metanotum, and mesopleuron (2–2.5 OD). Paraocular area and gena with moderately dense subappressed tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with moderately sparse, fine hairs. T1 acarinarial fan complete, without dorsal opening. T2–T3 with basolateral tomentum. T4 with scattered tomentum. T2 apicolateral and T3–T4 apical margins with sparse fringes.

Surface sculpture. Face imbricate, punctation fine. Clypeus with apical half polished, punctation moderately sparse (i=1–2d). Supraclypeal area with punctation moderately sparse (i=1–2.5d), denser laterally. Lower paraocular area punctation dense (i≤d). Antennocular area punctation moderately dense (i=1–1.5d). Upper paraocular area and frons very finely punctate. Ocellocular area punctate (i≤d). Gena and postgena lineolate. Mesoscutum weakly tessellate-imbricate, polished submedially, punctation sparse between parapsidal lines (i=1–2.5d), denser laterad of parapsidal line (i=1–1.5d), and on anterolateral portion (i≤d). Mesoscutellum similar to mesoscutum, submedial punctation sparse (i=1.5–5d). Axilla minutely punctate. Metanotum imbricate-punctate. Preëpisternum imbricate-rugulose. Hypoepimeral area imbricatepunctate (i=1–1.5d). Mesepisternum distinctly punctate (i=1–2d), interspaces tessellate dorsally, weakly imbricate to polished ventrally. Metepisternum with dorsal half rugoso-carinulate, ventral portion imbricate. Metapostnotum with short rugae extending approximately 2/3 distance to posterior margin, posterior margin weakly imbricate. Propodeum with dorsolateral slope imbricate, lateral and posterior surfaces tessellate. Metasomal terga weakly coriarious, punctation moderately dense basally (i=1-1.5d), T2 apical impressed area similarly punctate (i=1–2.5d) but extremely obscure.

Structure. Head moderately elongate (length/width ratio = 1.04). Eyes convergent below (UOD/LOD ratio = 1.23). Clypeus 1/2–2/3 below suborbital tangent, apicolateral angle convergent. Antennal sockets close (IAD/OAD <0.5).

Frontal line carinate, ending 2–2.5 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3 branches. Metapostnotum moderately elongate (MMR ratio = 1.30), posterior margin rounded onto posterior surface. Propodeum with oblique carina absent, lateral carina not reaching dorsal margin.

MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 4.17 mm; head length 1.31 mm; head width 1.19 mm; forewing length 3.39 mm.

Colouration. Flagellum with ventral surface brown.

Pubescence. Paraocular area with moderately dense tomentum. S2–S4 apical halves with moderately dense hairs (1.5 OD).

Surface sculpture. Punctation coarser. Mesoscutum polished, weakly imbricate medially. Mesepisternum polished, punctate. Metapostnotal rugae nearly reaching posterior margin. Metasomal terga with apical impressed areas impunctate.

Structure. Head elongate (length/width ratio = 1.10). Eyes strongly convergent below (UOD/LOD ratio = 1.55). Clypeus 2/3 below suborbital tangent, apicolateral margins convergent. Antennal sockets distant (IAD/OAD> 0.9). Frontal line carinate, ending 2 OD below median ocellus. Pedicel subequal to F1. F2 length 1.6X F1. F2–F10 moderately elongate (length/width ratio = 1.56–1.70). Metapostnotum elongate (MMR ratio = 1.16), posterior margin rounded onto posterior surface.

Terminalia . S7 with median lobe narrowly clavate, sides subparallel, apex rounded ( Fig. 211 ). S8 with apicomedial margin weakly convex ( Fig. 211 ). Genital capsule as in Fig. 211 . Gonobase with ventral arms narrowly separated. Volsella roughly ovoid. Gonostylus small, dorsal setae elongate. Retrorse lobe elongate, attenuated apically.

Range. South-eastern USA (Fig. 212). USA: FL, GA, NC, TX.

Additional material examined. USA: FLORIDA: 1Ƥ Leon Co., Apalachicola National Forest, " ant heaven", N30.31687 W084.50008, 20–27.vi.2005 (Ronquist Lab); [ AMNH]; 11ƤƤ 13 Alachua Co., Gainesville, 16.ix.1977 (L. Masner); 7ƤƤ 233 Highland Co., Lake Placid, Archbold Biol. Stn., 8–14.ix.1987 ( BRC Hym. Team); 4ƤƤ Highland Co., Lake Placid, Archbold Biol. Stn., 15–21.ix.1987 ( BRC Hym. Team); 5ƤƤ 13 Highland Co., Lake Placid, Archbold Biol. Stn., 21–27.ix.1987 ( BRC Hym. Team); 2ƤƤ 233 Highlands Co., Archbold Biol. Stn., 9–16.vi.1987 (D.B. Wahl); [ CNC]; 1Ƥ paratype Alachua Co., 17.ii.1955 (H.V. Weems, Jr.); 1Ƥ paratype Alachua Co., 16.iii.1955 (H.V. Weems, Jr.); 13 ( D. placidensis paratype) Manatee Co., Oneco, 25.iii.1954 (G.E. Ball); [ CUIC]; 1Ƥ Highland Co., N27.43 W081.3911, 3.vi.2007 (S.W. Droege); 1Ƥ13 Martin Co., N27.0204 W080.1069, 4.vi.2007 (S.W. Droege); 1Ƥ Martin Co., N27.0125 W080.1028, 4.vi.2007 (S.W. Droege); [ PCYU]; 633 Brevard Co., Titusville, 31.viii–14.ix.2000 (Z. Prusak, P.J. Russell, S. Fullerton); 13 Orange Co., Orlando, 4.vi.1993 (S.M. Fullerton); Orange Co.,Walt Disney World, 14–21.iv.1998 (Z. Prusek, S. Fullerton); [ UCFC]; GEORGIA: 1Ƥ paratype Tybee Is., 20.iv.1911; [ CUIC]; 1Ƥ13 Liberty Co., St. Catherines Isl., south beach area, 22–27.vi.1995 (A. Sharkov); [ PCYU]; TEXAS: 1Ƥ Nacogdoches Co., N31.501 W094.7639, 2–16.vi.2010 (C. Adams).

Floral records. ROSACEAE : Prunus angustifolia . DNA Barcode. Available. Multiple sequences. Comments. Common.

The synonymy of L. tarponense and D. placidensis was first recognized by George Eickwort (see Deyrup et al. 2002).

Figures

FIGURE 207. Lasioglossum tarponense (Mitchell) female, (A) lateral habitus, (B) face. Scale bars = 1 mm.

FIGURE 208. Lasioglossum tarponense (Mitchell) female, dorsal view of mesosoma.

FIGURE 209. Lasioglossum tarponense (Mitchell) male, (A) lateral habitus, (B) face. Scale bars = 1 mm.

FIGURE 210. Lasioglossum tarponense (Mitchell) male, dorsal view of mesosoma.

FIGURE 211. Lasioglossum tarponense (Mitchell) male terminalia, (A) ventral view, (B) dorsal view, (C) S 7 and S 8. Scale bar = 0.5 mm.