Geostiba (Sibiota) nimbicola Lohse & Smetana, 1988
publication ID |
https://doi.org/ 10.5281/zenodo.155701 |
DOI |
https://doi.org/10.5281/zenodo.6277566 |
persistent identifier |
https://treatment.plazi.org/id/5B50E916-FF80-3901-4D2D-F97FFDFEFD4C |
treatment provided by |
Plazi |
scientific name |
Geostiba (Sibiota) nimbicola Lohse & Smetana, 1988 |
status |
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4. Geostiba (Sibiota) nimbicola Lohse & Smetana, 1988 View in CoL ( Figs. 94119 View FIGURES 94 99 View FIGURES 100 107 View FIGURES 108 119 )
Geostiba nimbicola Lohse & Smetana, 1988: 275 View in CoL .
Geostiba bicarinata: Lohse & Smetana, 1988: 273 View in CoL , ex parte (misidentification). Geostiba nimbicola: Pace, 1997: 106 View in CoL .
Type material. Holotype ,, UNITED STATES: Tennessee / North Carolina: Sevier Co. / Swain Co.: Great Smoky Mountains National Park, Clingmans Dome [35°33'46"N 83°29'55"W], 19502020 m, (A.Smetana) 2.vi.1986 ( CNCI); allotype,, same data as the holotype; paratypes: 3,, ditto (all – CNCI).
Additional material. UNITED STATES: Tennessee / North Carolina: Sevier Co. / Swain Co.: (with missing abdomen), same data as the holotype ( CNCI); 2, 3, ditto but (W.S.Suter) 29.v.1982 ( KSEM); Tennessee: Sevier Co.:, 4, Great Smoky Mts. National Park, Ramsey Cascade, [35°42'30"N 83°18'02"W], moss on rock (Lackey), 21.vii.1956 ( FMNH, SPSU); North Carolina: Haywood Co.: 15 specimens, Mount Sterling Ridge, 26 km NNW Waynesville, 35°41.9'N 83°07.5'W, 1700 m, in forest litter, Picea , Abies , Quercus , Betula (V.I.Gusarov) , 22.ix.2001; 14 specimens, ditto but, 35°42.1'N 83°06.8'W, 1550 m, Picea , Rhododendron , Betula (all – KSEM and SPSU)
One of the paratypes of G. bicarinata listed by Lohse & Smetana (1988: 275) (not found in CNCI) must also belong to G. nimbicola (1 specimen, Great Smoky Mountains National Park, Clingmans Dome, 19502020 m, (A.Smetana) 2.vi.1986). This assertion is based on the results of my extensive collecting efforts which demonstrated that G. bicarinata is restricted to the Great Balsam Mountains – Pisgah Ridge massif.
Diagnosis. Geostiba nimbicola can be distinguished from other Nearctic species of Geostiba by having small eyes (temple length to eye length ratio 3.04.0), pronotal pubescence of type V, reduced wings, short elytra (pronotum length to elytron length ratio 1.3), the presence of two short parallel carinae in the middle of abdominal tergum 7 in front of posterior margin, the shape of the aedeagus ( Figs. 100112, 114119 View FIGURES 100 107 View FIGURES 108 119 ) and the shape of the spermatheca ( Fig. 113 View FIGURES 108 119 ).
Geostiba nimbicola is closely related to G. pluvigena , G. nebuligena , and G. crepusculigena . Geostiba nimbicola differs from G. pluvigena in having longer and more narrow apex of median lobe without apical denticle (in lateral view) ( Figs. 100107 View FIGURES 100 107 , 126133 View FIGURES 126 133 ); from G. nebuligena in having deeper apical emargination in female sternum 8 ( Figs. 97 98 View FIGURES 94 99 , 149150 View FIGURES 146 151 ), longer and more narrow apex of median lobe without apical denticle (in lateral view) ( Figs. 100107 View FIGURES 100 107 , 152156 View FIGURES 152 156 ); from G. crepusculigena in lacking obtuse projection on the ventral side of the apex of median lobe ( Figs. 102103 View FIGURES 100 107 , 176177 View FIGURES 174 177 ).
Description. Length 1.62.0 mm. Light brown or brown, apex of abdomen often lighter, antennae brownish yellow or light brown, legs and mouthparts brownish yellow. Body parallelsided.
Head as wide as long, surface on disk with fine isodiametric microsculpture, puncturation very fine, distance between punctures equal to 34 times their diameter. Temple length to eye length ratio 3.04.0. Antennal article 2 longer than article 3, article 4 transverse (width to length ratio 1.6), articles 510 strongly transverse, last article as long as 9 and 10 combined (as in Fig. 17 View FIGURES 8 17 ).
Pronotum as wide as long, width 0.370.40 mm, wider than head (pronotal width to head width ratio 1.1); microsculpture and puncturation as on head. Pronotal pubescence of type V. 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 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 37 times their diameter. Tergum 7 without white edge. Male tergum 7 with two medial carinae in front of posterior margin. Male tergum 8 with two weak and short carinae in front of posterior margin, posterior margin convex ( Fig. 94 View FIGURES 94 99 ). Male sternum 8 with convex posterior margin ( Fig. 95 View FIGURES 94 99 ).
Female tergum 8 with convex posterior margin ( Fig. 96 View FIGURES 94 99 ), sternum 8 with emarginate posterior margin ( Figs. 9798 View FIGURES 94 99 ).
Aedeagus as in Figs. 100112, 114119 View FIGURES 100 107 View FIGURES 108 119 . Apex of median lobe in ventral view narrow, its outline convex apically ( Figs. 100101, 104105 View FIGURES 100 107 ), in lateral view strait, without apical denticle or obtuse projection ventrally ( Figs. 102103, 106107 View FIGURES 100 107 ), distal diverticula of internal sac in ventral view broad ( Figs. 111112 View FIGURES 108 119 ).
Spermatheca as in Fig. 113 View FIGURES 108 119 .
Distribution. Known from the Great Smoky Mountains massif (Tennessee and North Carolina) ( Figs. 338 View FIGURE 338 , 340 View FIGURE 340 ).
Natural History. Geostiba nimbicola was collected at altitudes above 1500 m in moss or in leaf litter in mixed forest with red spruce ( Picea rubens ), Fraser’s fir ( Abies fraseri ), birch and oak.
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) nimbicola Lohse & Smetana, 1988
Gusarov, Vladimir I. 2002 |
Geostiba nimbicola
Lohse 1988: 275 |
Geostiba bicarinata:
Pace 1997: 106 |
Lohse 1988: 273 |