Geostiba (Sibiota) nubigena Lohse & Smetana, 1988
publication ID |
https://doi.org/ 10.5281/zenodo.155701 |
DOI |
https://doi.org/10.5281/zenodo.6277577 |
persistent identifier |
https://treatment.plazi.org/id/5B50E916-FFAD-391B-4D2D-FDE7FE48FCBC |
treatment provided by |
Plazi |
scientific name |
Geostiba (Sibiota) nubigena Lohse & Smetana, 1988 |
status |
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9. Geostiba (Sibiota) nubigena Lohse & Smetana, 1988 View in CoL ( Figs. 213246 View FIGURES 213 218 View FIGURES 219 229 View FIGURES 230 246 )
Geostiba nubigena Lohse & Smetana, 1988: 273 View in CoL . Geostiba nubigena: Pace, 1997: 104 View in CoL .
Type material. Holotype ,, UNITED STATES: North Carolina: Haywood Co.: Richland Balsam Mt. [35°22'01"N 82°59'26"W], 18501950 m (A.Smetana), 25.v.1986 ( CNCI); allotype,, ditto; paratypes: 4, ditto; 3,, ditto but 18601950 m, 27.v.1986;,, Shining Rock Mt. [35°22'05"N 82°51'45"W], 1500 m (A.Smetana), 31.v.1986 (all CNCI).
Additional material. UNITED STATES: North Carolina: Haywood Co.:, same data as the holotype ( CNCI); 14 specimens, Black Balsam Knob Road N of Blue Ridge Parkway, 21 km SSE Waynesville, 35°19.1'N 82°52.6'W, 1800 m, in forest litter, Picea (V.I.Gusarov) , 20.ix.2001; 12 specimens, Blue Ridge Parkway above Graveyard Fields parking, right bank of the river, 22 km SE Waynesville, 35°19.1'N 82°50.7'W, 1600 m, in forest litter, Picea , Betula (V.I.Gusarov) , 20.ix.2001; 18 specimens, Blue Ridge Parkway at Graveyard Fields, right bank of the river, 22 km SE Waynesville, 35°19.2'N 82°50.7'W, 1550 m, in forest litter by the river, Picea , Betula , Rhododendron , Vaccinium (V.I.Gusarov) , 20.ix.2001; 15 specimens, Graveyard Fields, left bank of the river, 22 km SE Waynesville, 35°19.57'N 82°51.01'W, 1570 m, in forest litter, Picea (V.I.Gusarov) , 20.ix.2001; 2 specimens, Graveyard Fields, right bank of the river, 23 km SE Waynesville, 35°19.24'N 82°50.87'W, 1600 m, in forest litter, Rhododendron (V.I.Gusarov) , 24.vi.2001; 2 specimens, environs of Sam Knob, 21 km SE Waynesville, 35°19.62'N 82°53.08'W, 1800 m, mountain meadows, in dead grass (V.I.Gusarov), 24.vi.2001; 6 specimens, Highway 215, 21 km SSE Waynesville, 35°18.80'N 82°54.78'W, 1500 m, in forest litter, Picea , Betula , Rhododendron (V.I.Gusarov) , 24.vi.2001; Haywood Co. / Jackson Co.:, Blue Ridge Parkway, Grassy Ridge Mine Overlook, 8 km SSW Waynesville, 35°24.94'N 83°02.80'W, 1650 m, in forest litter, Tsuga , Quercus , Betula (V.I.Gusarov) , 2.vi.2001; 14 specimens, Blue Ridge Parkway, 21 km SSE Waynesville, 35°18.42'N 82°56.47'W, 1600 m, in forest litter, Picea rubens , Abies fraseri , Oxalis (V.I.Gusarov) , 3.vi.2001; 9 specimens, ditto but 13 km S Waynesville, 35°22.12'N 82°59.65'W, 1800 m; 12 specimens, ditto but 11 km SSW Waynesville, 35°23.3'N 83°02'W, 1800 m, in forest litter, Picea rubens , Abies fraseri , Betula , Oxalis , 2.vi.2001; 3 specimens, Richland Balsam Mt., near summit, 14 km S Waynesville, 35°22.50'N 82°59.43'W, 1950 m, in forest litter, Picea rubens , Abies fraseri, Va c ci n iu m (V.I.Gusarov), 3.vi.2001; 2 specimens, ditto but W slope of Richland Balsam Mt., 35°22.28'N 82°59.42'W, 1900 m, in forest litter, Picea rubens , Abies fraseri ; 2 specimens, ditto but S slope of Richland Balsam Mt., 35°21.04'N 82°59.56'W, 1850 m, in forest litter, Picea rubens , Abies fraseri , Betula , Oxalis ; Haywood Co. / Transylvania Co.: 3 specimens, Blue Ridge Parkway, 23 km SE Waynesville, 35°19.13'N 82°50.08'W, 1500 m, in forest litter, Quercus , Picea rubens , Tsuga , Fagus , Acer , Rhododendron , Vaccinium (V.I.Gusarov) , 3.vi.2001;, Blue Ridge Parkway, 22 km SSE Waynesville, 35°18.32'N 82°53.49'W, 1700 m, in forest litter, Picea , Abies , Quercus , Betula , Acer (V.I.Gusarov) , 24.vi.2001; 24 specimens, Blue Ridge Parkway, 23 km SEE Waynesville, 35°25.2'N 82°45.0'W, 1550 m, in forest litter, Picea , Rhododendron , Quercus (V.I.Gusarov) , 20.ix.2001; Haywood Co. / Buncombe Co.: 6 specimens, Little Pisgah Mountain near summit, 22 km SEE Waynesville, 35°25.48'N 82°45.51'W, 17301760 m, in forest litter, Fagus , Quercus , Rhododendron (V.I.Gusarov) , 20.ix.2001; 12 specimens, S slope of Little Pisgah Mountain, 22 km SEE Waynesville, 35°25.05'N 82°45.81'W, 1650 m, in forest litter, Picea , Betula , Acer (V.I.Gusarov) , 20.ix.2001; Macon Co. / Clay Co.:, Blue Ridge, Appalachian National Scenic Trail, 21.5 km SW Franklin, 35°01.64'N 83°32.16'W, 1620 m, in forest litter, Quercus , Kalmia latifolia (V.I.Gusarov) , 23.vi.2001 (all – KSEM and SPSU).
Diagnosis. Geostiba nubigena can be distinguished from other Nearctic species of Geostiba by having small eyes (temple length to eye length ratio 4.36.0), pronotal pubescence of type V, reduced wings, short elytra (pronotum length to elytron length ratio 1.3), the absence of carinae on abdominal tergum 7, the shape of the aedeagus ( Figs. 219234, 237246 View FIGURES 219 229 View FIGURES 230 246 ) and the shape of the spermatheca ( Figs. 235236 View FIGURES 230 246 ).
Geostiba nubigena differs from G. balsamensis in lacking the carinae on male tergum 7 and in having more narrow apex of median lobe ( Figs. 219220, 223229 View FIGURES 219 229 , 193194 View FIGURES 193 196 ); from G. coeligena in having more narrow median lobe of aedeagus (in ventral view) ( Figs. 219220, 223229 View FIGURES 219 229 , 249250 View FIGURES 247 252 ), long distal diverticula ( Figs. 233234 View FIGURES 230 246 , 253, 256 View FIGURES 253 261 ) and small proximal diverticula of internal sac ( Figs. 234 View FIGURES 230 246 , 253, 257258 View FIGURES 253 261 ).
Description. Length 1.82.2 mm. Uniformly brownish yellow, in some specimens abdominal segments 36 light brown. Body parallelsided.
Head as wide as long, surface on disk with fine isodiametric microsculpture, puncturation very fine, distance between punctures equal to 24 times their diameter. Temple length to eye length ratio 4.36.0. Antennal article 2 longer than article 3, article 410 transverse to strongly transverse, last article as long as 9 and 10 combined.
Pronotum as wide as long, width 0.340.39 mm, wider than head (pronotal width to head width ratio 1.1); microsculpture and puncturation as on head. Elytra measured from humeral angle shorter than pronotum (pronotal length to elytral length ratio 1.3), wider than long (1.4), with fine isodiametric microsculpture and fine asperate puncturation, distance between punctures equals 12 times their diameter. Pronotal pubescence of type V.
Elytral suture behind scutellum slightly raised in both sexes. Wings reduced to short vestiges, shorter than elytra.
Abdominal terga with fine microsculpture of transverse meshes, with fine and sparse puncturation, puncturation becoming finer towards abdomen apex, on terga 35 distance between punctures equals 25 times their diameter. Tergum 7 without white edge.
Male tergum 7 without carinae. Posterior margin of male tergum 8 slightly convex ( Fig. 213 View FIGURES 213 218 ). Posterior margin of male sternum 8 convex ( Fig. 214 View FIGURES 213 218 ).
Female tergum 8 with slightly convex posterior margin ( Fig. 215 View FIGURES 213 218 ), sternum 8 with slightly emarginate posterior margin ( Figs. 216217 View FIGURES 213 218 ).
Aedeagus as in Figs. 219234, 237246 View FIGURES 219 229 View FIGURES 230 246 . Apex of median lobe in lateral view strait ( Figs. 221222 View FIGURES 219 229 ).
Spermatheca as in Figs. 235236 View FIGURES 230 246 .
Distribution and variability. Known from the Great Balsam Mountains – Pisgah Ridge massif and from Standing Indian in the Blue Ridge (North Carolina) ( Figs. 338 View FIGURE 338 , 340 View FIGURE 340 ). Geostiba nubigena is variable in the shape of aedeagus median lobe ( Figs. 219229 View FIGURES 219 229 ). Forms from different mountains have different shape of median lobe, but when specimens from many localities were compared no cline or clear hiatus between different forms were found. The locality on Standing Indian is quite distant from other localities in the Great Balsam Mts.Pisgah Ridge massif. However in aedeagus shape the specimens from Standing Indian fall within the range of variability of G. nubigena .
Natural History. Geostiba nubigena was collected at altitudes above 1500 m in leaf litter, mostly in forests with red spruce ( Picea rubens ) and Fraser’s fir ( Abies fraseri ), in some localities in forests with oak, beech, rhododendron and mountain laurel but without any conifers.
CNCI |
Canadian National Collection Insects |
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.
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Geostiba (Sibiota) nubigena Lohse & Smetana, 1988
Gusarov, Vladimir I. 2002 |
Geostiba nubigena
Pace 1997: 104 |
Lohse 1988: 273 |