Labium walkeri Turner & Waterson, 1920
|
publication ID |
https://doi.org/ 10.11646/zootaxa.5471.2.5 |
|
publication LSID |
lsid:zoobank.org:pub:0DCFF182-6161-48E3-9FD8-89CD2C43E74D |
|
DOI |
https://doi.org/10.5281/zenodo.12190737 |
|
persistent identifier |
https://treatment.plazi.org/id/EE358F68-FF8D-FFC1-0285-81BC925BFB32 |
|
treatment provided by |
Plazi |
|
scientific name |
Labium walkeri Turner & Waterson, 1920 |
| status |
|
Labium walkeri Turner & Waterson, 1920 View in CoL
( Figs 1 View FIGURE 1 , 2 View FIGURE 2 , 4 View FIGURE 4 )
Diagnosis. Labium walkeri can be distinguished from all other Australian species by the following characters in combination: antenna with 22–25 flagellomeres ( Fig. 1A View FIGURE 1 , 2H View FIGURE 2 ); face as broad as long ( Fig. 1B View FIGURE 1 , 2B View FIGURE 2 ); clypeus slightly convex, in lateral view in the same plane of face, with fine and moderately dense setiferous punctures; occipital carina complete. Fore wing with vein 2 m-cu only weakly bent in the middle, not abruptly angled ( Fig. 1F View FIGURE 1 , 2E View FIGURE 2 ) as in other species of the genus. Hind wing with distal abscissa of CU missing; cu-a + first abscissa of CU straight or slightly curved, not angled ( Fig. 1A View FIGURE 1 , 2G View FIGURE 2 ).
Description. Female: Body length 5.15–5.4 mm. Fore wing length 3.6–4.0 mm.
Head. In dorsal view 2.06–2.10 × as wide as long; clypeus 2.0–2.2 × as broad as high, clypeal sulcus slightly insinuated, less so in the middle than at the sides, face and clypeus slightly convex ( Fig. 1B View FIGURE 1 ), in lateral view in the same plane, with fine and moderately dense setiferous punctures; face as broad as long ( Fig. 1B View FIGURE 1 ); malar space 0.58–0.70 × as long as basal width of mandible; eyes somewhat emarginate above the antennal insertions; vertex and frons smooth with sparse setiferous punctures; gena smooth, in dorsal view, rounded, 0.62–0.72 × as long as eye; posterior ocellus separated from eye 1.37–1.58 × its own maximum diameter; distance between posterior ocelli 1.18–1.33 × maximum diameter of posterior ocellus; occipital carina complete. Antenna with 22–24 flagellar segments ( Fig. 1A View FIGURE 1 ); second flagellar segment 0.9–1.0 × the length of first one.
Mesosoma. Pronotum smooth and shiny with weak rugae ventrally ( Fig. 1D View FIGURE 1 ); mesoscutum smooth and shiny very scarcely punctate ( Fig. 1E View FIGURE 1 ), middle lobe of mesonotum not prominent; notauli short 0.13–0.16 × the length of mesoscutum; mesopleuron smooth and shiny with sparse setiferous punctures ( Fig. 1D View FIGURE 1 ), mesopleural furrow crenulate, epicnemial carina reaching half length of pronotum, sternaulus absent; metapleuron entirely smooth and shiny, juxtacoxal carina strong and well defined posteriorly, replaced by some rugae anteriorly, submetapleural carina expanded anteriorly in a prominent lobe ( Fig. 1D View FIGURE 1 ). Propodeum ( Fig. 1C View FIGURE 1 ) mostly smooth and shiny, posterior areas slightly rugulose; lateral areas with long and moderately dense setae; area superomedia hexagonal, 1.27–1.5 × wider than long, slightly broader anteriorly than posteriorly, clearly separated from the petiolar area and basal area, sometimes narrowly opened to basal area in the mid part; area basalis short and broad. Hind leg with trochanter swollen dorsally ( Fig. 1A View FIGURE 1 ); femur 2.57–2.75 × as long as high. Fore wing ( Fig. 1F View FIGURE 1 ) with areolet pentagonal, 1.15–1.2 × as broad as long; abscissa of M between 3 rs-m and 2 m-cu much shorter than abscissa between 2 rs-m and 2 m-cu; vein 2 m-cu feebly bent in the middle; vein 1 cu-a conspicuously postfurcal to M&Rs. Hind wing with distal abscissa of CU absent; cu-a + first abscissa of CU straight or slightly curved, not angled ( Fig. 1A View FIGURE 1 ).
Metasoma. Tergite I 1.8–1.9 × as long as posteriorly broad, smooth and shiny with subbasal tooth and prominent spiracular area ( Fig. 1E View FIGURE 1 ); tergite II 0.62–0.76 × as long as posteriorly broad, smooth and shiny, with scarcely short setae; tergites III–VII densely and finely punctate with pubescent setae ( Fig. 1G View FIGURE 1 ); ovipositor not reaching the end of metasoma, short and straight ( Fig. 1G View FIGURE 1 ).
Colouration: Black and dark orange ( Fig. 1 View FIGURE 1 ); head dark brown to black, mandible (except dark brown apex), labrum, clypeus, malar space, face, frontal, and genal orbits narrowly (except dorsal part), white cream. Antenna dark brown, light brown ventrally, scapus whitish ventrally. Mesosoma mostly dark orange; tegula, scuto-scutellar groove, axillae, juxtacoxal area and narrowly the dorsal part of mesopleuron, dark brown; posterior part of scutellum, postscutellum, posterior spot on metapleuron, and subtegular ridge, yellow cream. Fore and mid legs light brown posteriorly, white cream anteriorly; proximal tarsi white cream, distal tarsi dark brown. Hind leg mostly dark brown; base of coxa and lateral spots on femur, orange; mid part of tibia white cream. Wings hyaline. Metasoma dark brown; tergites I–III with posterior margin white.
Male: Body length 4.8–5.84 mm. Fore wing 3.6–4 mm.
Head. In dorsal view 1.71–1.6 × as wide as long; clypeus 2.0–2.1 × as broad as long, clypeal sulcus distinct, less so in the middle than at the sides; face and clypeus slightly convex, with fine and moderately dense setiferous punctures ( Fig. 2B View FIGURE 2 ); occipital carina complete; malar space 0.54–0.71 × as long as basal width of mandible; eyes somewhat emarginate above the antennal sockets ( Fig. 2B View FIGURE 2 ); vertex and front smooth and shiny, with sparse setiferous punctures ( Fig. 2G View FIGURE 2 ); gena smooth with moderately dense setiferous punctures, rounded in dorsal view, 0.5–0.6 × as long as eye; posterior ocellus separated from eye about 1.42–1.14 × its own maximum diameter; distance between posterior ocelli 1.14–0.85 × the maximum diameter of posterior ocellus.Antenna with 22–25 flagellar segments, the second flagellar segment 0.9–1.0 × the length of first one ( Fig. 2H View FIGURE 2 ).
Mesosoma. Pronotum mostly smooth and shiny, with weak rugae ventrally ( Fig. 2F View FIGURE 2 ); mesoscutum ( Fig. 2G View FIGURE 2 ) smooth and shiny with very scarcely setiferous punctures, denser anteriorly and laterally; middle lobe of mesonotum not prominent; notauli short 0.16–0.2 × the length of mesoscutum; mesopleuron ( Fig. 2F View FIGURE 2 ) smooth and shiny with sparse setiferous punctures, mesopleural furrow crenulate, epicnemial carina reaching half length of pronotum, sternaulus absent; metapleuron entirely smooth and shiny, juxtacoxal carina complete, submetapleural carina expanded anteriorly into a prominent lobe. Propodeum ( Fig. 2D View FIGURE 2 ) mostly smooth and shiny, posterior areas slightly rugulose; lateral areas somewhat rugulose with long and moderately dense setae; area superomedia 1.30 × as wide as long, much wider anteriorly than posteriorly, hexagonal, separated from petiolar area, narrowly opened to basal area in the mid part; area basalis short and broad. Hind leg with trochanter swollen dorsally ( Fig. 2C View FIGURE 2 ), femur 3.5–3.75 × as long as high. Fore wing ( Fig. 2E View FIGURE 2 ) with areolet pentagonal, 1.1–1.15 × as broad as high; abscissa of M between 3 rs-m and 2 m-cu much shorter than abscissa between 2 rs-m and 2 m-cu; vein 2 m-cu feebly bent in the middle; vein 1 cu-a conspicuously postfurcal to M&Rs. Hind wing ( Fig. 2E View FIGURE 2 ) with distal abscissa CU absent; cu-a + first abscissa of CU straight or slightly curved, not angled.
Metasoma. Tergite I ( Fig. 2G View FIGURE 2 ) 2.0 –2.6 × as long as posteriorly broad, smooth and shiny without subbasal tooth, with a prominent spiracular area; tergite II 0.69–0.7 × as long as posteriorly broad, smooth and shiny, with very sparce setiferous punctures; tergites III–VII finely punctate with short dense setae ( Fig. 2G View FIGURE 2 ).
Colouration: Black and brownish ( Fig. 2 View FIGURE 2 ); head black, mandible (except dark brown apex), labrum, clypeus, malar space, face, frontal orbits, and genal orbits narrowly (except dorsal part), white cream. Antenna dark brown dorsally, flagellum yellow ventrally except first flagellar segment, scapus whitish ventrally. Mesosoma black; tegula, scutellum, postscutellum, subtegular ridge, weak spot on mid anterior part of mesopleuron, and posterior spot on metapleuron, yellow cream. Fore and mid legs mostly white cream; distal tarsi slightly brownish. Hind leg mostly dark brown; hind coxa black, posterior edge of coxa, trochanter, trochantellus and mid part of tibia white, lateral spots on femur, orange. Wings hyaline. Metasoma dark brown; tergite I black, tergites I–V with posterior margin white.
Material examined: 1 ♂, holotype, Hobart , Tasmania, summer 1891, NHMUK010636268 View Materials (Images from NHM Data Portal) ; 2 ♂♂, 2 ♀♀, Australia, Victoria Tylden South , 3444, 4.III.2016 / 18.III.2016, Bonavia 2, Malaise Trap, Leg. A. Campoy ; 1 ♀, Australia, Victoria, Musk , 25.II.2016 / 4.III.2016, Rza 1, Malaise Trap, leg. A. Campoy ( CEUA) .
Distribution: Australia (Tasmania and Victoria) ( Fig. 4 View FIGURE 4 ).
Remarks: The species L. walkeri , together with L. centrale Turner & Waterson, 1920, L. raymenti Cushman, 1934, and L. brevicorne Turner & Waterson, 1920, can be distinguished from other Australian species by antennae with fewer than 30 flagellomeres (Turner & Waterson, 1920; Cushman, 1934). Furthermore, L walkeri can be distinguished from those four species by fore wing vein 2 m-cu only weakly bent in the middle ( Figs 1F View FIGURE 1 , 2E View FIGURE 2 ), hind wing with vein cu-a + first abscissa of CU straight, distal abscissa of CU absent ( Figs 1A, 1F View FIGURE 1 , 2E View FIGURE 2 ), head dark with yellow markings, and mesosoma black in male and dark orange in female ( Figs. 1–2 View FIGURE 1 View FIGURE 2 ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.