Geostiba (Sibiota) nubigena Lohse & Smetana, 1988

Gusarov, Vladimir I., 2002, A revision of Nearctic species of the genus Geostiba Thomson, 1858 (Coleoptera: Staphylinidae: Aleocharinae), Zootaxa 81, pp. 1-88: 52-57

publication ID

http://doi.org/ 10.5281/zenodo.155701

publication LSID

lsid:zoobank.org:pub:B36587A1-248A-4194-8424-46C9BBA15606

persistent identifier

http://treatment.plazi.org/id/5B50E916-FFAD-391B-4D2D-FDE7FE48FCBC

treatment provided by

Plazi

scientific name

Geostiba (Sibiota) nubigena Lohse & Smetana, 1988
status

 

9. Geostiba (Sibiota) nubigena Lohse & Smetana, 1988  ( Figs. 213­246View FIGURES 213 ­ 218View FIGURES 219 ­ 229View FIGURES 230 ­ 246)

Geostiba nubigena Lohse & Smetana, 1988: 273  . Geostiba nubigena: Pace, 1997: 104  .

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 4.3 ­6.0), 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, 237 ­ 246View FIGURES 219 ­ 229View FIGURES 230 ­ 246) and the shape of the spermatheca ( Figs. 235­236View 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, 223 ­ 229View FIGURES 219 ­ 229, 193­ 194View FIGURES 193 ­ 196); from G. coeligena  in having more narrow median lobe of aedeagus (in ventral view) ( Figs. 219­220, 223 ­ 229View FIGURES 219 ­ 229, 249­ 250View FIGURES 247 ­ 252), long distal diverticula ( Figs. 233­234View FIGURES 230 ­ 246, 253, 256View FIGURES 253 ­ 261) and small proximal diverticula of internal sac ( Figs. 234View FIGURES 230 ­ 246, 253, 257­ 258View 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 4.3 ­6.0. 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. 213View FIGURES 213 ­ 218). Posterior margin of male sternum 8 convex ( Fig. 214View FIGURES 213 ­ 218).

Female tergum 8 with slightly convex posterior margin ( Fig. 215View FIGURES 213 ­ 218), sternum 8 with slightly emarginate posterior margin ( Figs. 216­217View FIGURES 213 ­ 218).

Aedeagus as in Figs. 219­234, 237 ­ 246View FIGURES 219 ­ 229View FIGURES 230 ­ 246. Apex of median lobe in lateral view strait ( Figs. 221­222View FIGURES 219 ­ 229).

Spermatheca as in Figs. 235­236View 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. 338View FIGURE 338, 340View FIGURE 340). Geostiba nubigena  is variable in the shape of aedeagus median lobe ( Figs. 219­229View 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

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Geostiba

Loc

Geostiba (Sibiota) nubigena Lohse & Smetana, 1988

Gusarov, Vladimir I. 2002
2002
Loc

Geostiba nubigena

Pace 1997: 104
Lohse 1988: 273