Geostiba (Sibiota) carteriensis Pace, 1997
publication ID |
https://doi.org/ 10.5281/zenodo.155701 |
DOI |
https://doi.org/10.5281/zenodo.6277583 |
persistent identifier |
https://treatment.plazi.org/id/5B50E916-FFA1-3960-4D2D-F9FFFD8DFA4C |
treatment provided by |
Plazi |
scientific name |
Geostiba (Sibiota) carteriensis Pace, 1997 |
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12. Geostiba (Sibiota) carteriensis Pace, 1997 View in CoL ( Figs. 284305 View FIGURES 284 288 View FIGURES 289 293 View FIGURES 294 305 )
Geostiba (Lioglutosipalia) carteriensis Pace, 1997: 106 View in CoL , ex parte.
Type material. Two paratypes of G. carteriensis belong to G. alticola : 2, Yancey Co.: Mt. Mitchell, 1800 m (P.Debs), 17.iv.1974 (not examined). My collecting demonstrated that these paratypes originate from the mountain massif where G. carteriensis does not occur. These presumably misidentified paratypes belong to G. alticola .
Material. UNITED STATES: Tennessee / North Carolina: Carter Co. / Mitchell Co.: 12 specimens, 29 km SSE Elizabethton, Roan Road Pass, Rd. 143/261, 36°06.3'N 82°06.8'W, 1700 m, in forest litter and moss, Picea , Rhododendron (V.I.Gusarov) , 17.iii.2001; Unicoi Co. / Yancey Co.: 12 specimens, 9 km E Lewisburg, Big Bald, 35°59.57'N 82°29.61'W, 1650 m, meadows, in grass (V.I.Gusarov), 21.ix.2001 (all KSEM and SPSU).
Type locality. UNITED STATES: Tennessee / North Carolina: Carter Co. / Mitchell Co.: Roan Mountain, Forest Road 130, 6300’ ( Pace 1997).
Diagnosis. Geostiba carteriensis can be distinguished from other Nearctic species of Geostiba by having small eyes (temple length to eye length ratio 3.84.6), pronotal pubescence of type V or VI, pronotal pubescence directed posteriorly in a wide medial zone (wider in males), not just along the midline, 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. 289298, 300305 View FIGURES 289 293 View FIGURES 294 305 ) and the shape of the spermatheca ( Fig. 299 View FIGURES 294 305 ).
Geostiba carteriensis differs from closely related G. alticola in having shorter and wider (in lateral view) apex of the aedeagus median lobe ( Figs. 292293 View FIGURES 289 293 , 269270 View FIGURES 267 270 ) and the lateral sides of the apex more convex (in ventral view) ( Figs. 289291 View FIGURES 289 293 , 267268 View FIGURES 267 270 ).
Description. Length 2.22.6 mm. Body uniformly yellowish brown, in some specimens abdominal segments 36 darker. 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 3.84.6. Antennal article 2 longer than article 3, article 4 subquadrate, articles 510 transverse, last article as long as 9 and 10 combined.
Pronotum as wide as long, width 0.400.44 mm, wider than head (pronotal width to head width ratio 1.1); microsculpture and puncturation as on head; pronotal pubescence of type V or VI, directed posteriorly in wide medial zone (wider in males), not just along midline. Elytra measured from humeral angle shorter than pronotum (pronotal length to elytral length ratio 1.3), wider than long (1.5), with fine isodiametric microsculpture and fine asperate puncturation, distance between punctures equals 23 times their diameter. Elytral suture behind scutellum very slightly raised. 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.
Males with stronger impression on disc of head and along midline of pronotum than females. Male tergum 7 without carinae. Posterior margin of male tergum 8 slightly convex ( Fig. 284 View FIGURES 284 288 ). Posterior margin of male sternum 8 convex ( Fig. 285 View FIGURES 284 288 ).
Posterior margin of female tergum 8 convex ( Fig. 286 View FIGURES 284 288 ). Posterior margin of female sternum 8 concave medially ( Figs. 287288 View FIGURES 284 288 ).
Aedeagus as in Figs. 289298, 300305 View FIGURES 289 293 View FIGURES 294 305 . Apex of median lobe in lateral view strait ( Figs. 292293 View FIGURES 289 293 ), in ventral view apex outline strongly emarginate basally ( Figs. 289291 View FIGURES 289 293 ). Distal diverticula of internal sac narrow ( Figs. 297298, 304 View FIGURES 294 305 ).
Spermatheca as in Fig. 299 View FIGURES 294 305 .
Distribution and variability. Known only from the Big Bald in the Bald Mountains massif and from Roan Mountains ( Figs. 338339 View FIGURE 338 View FIGURE 339 ). Specimens from the Big Bald and from Roan High Knob (the type locality) slightly differ in the shape of the apex of median lobe ( Figs. 289290 View FIGURES 289 293 ) and may deserve to be interpreted as distinct taxa. More samples from the adjacent mountains (especially north of Roan Mountains) are necessary to resolve this problem.
Natural History. Geostiba carteriensis was collected in forest litter at altitudes above 1600 m in leaf litter of coniferous forest with red spruce ( Picea rubens ) and in the soil of a mountain meadow (a “bald”).
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) carteriensis Pace, 1997
Gusarov, Vladimir I. 2002 |
Geostiba (Lioglutosipalia) carteriensis
Pace 1997: 106 |