Geostiba (Sibiota) graveyardensis Pace, 1997

Gusarov, Vladimir I., 2002, A revision of Nearctic species of the genus Geostiba Thomson, 1858 (Coleoptera: Staphylinidae: Aleocharinae), Zootaxa 81, pp. 1-88: 28-31

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-FF85-393D-4D2D-FBEDFE81FE5C

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Plazi

scientific name

Geostiba (Sibiota) graveyardensis Pace, 1997
status

 

3. Geostiba (Sibiota) graveyardensis Pace, 1997  ( Figs. 72­93View FIGURES 72 ­ 76View FIGURES 77 ­ 80View FIGURES 81 ­ 93)

Geostiba (Ditroposipalia) graveyardensis Pace, 1997: 102  .

Material. UNITED STATES: North Carolina: Haywood Co.: 2 specimens, Graveyard Fields at Blue Ridge Parkway, 22 km SE Waynesville, right bank of the river, 35 ° 19.2 'N 82 ° 50.7 'W, 1550 m, in forest litter by the river, Picea  , Betula  , Rhododendron  (V.I.Gusarov), 20.ix. 2001; 48 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 (all KSEM and SPSU).

Type locality. UNITED STATES: North Carolina: Haywood Co.: Graveyard Fields at Blue Ridge Parkway ( Pace 1997).

Diagnosis. Geostiba graveyardensis  can be distinguished from other Nearctic species of Geostiba  by having small eyes (temple length to eye length ratio 2.8­3.8), 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. 77 ­85, 87­ 93View FIGURES 77 ­ 80View FIGURES 81 ­ 93) and the shape of the spermatheca ( Fig. 86View FIGURES 81 ­ 93).

Geostiba graveyardensis  is closely related to G. bicarinata  but differs in the following: the apex of median lobe in lateral view bent ventrally ( Figs. 79 ­80View FIGURES 77 ­ 80, 59­ 60View FIGURES 57 ­ 60), in ventral view with apical process ( Figs. 77 ­78View FIGURES 77 ­ 80, 57­ 58View FIGURES 57 ­ 60).

Description. Length 1.9­2.3 mm. Brown or dark brown, elytra and apex of abdomen often lighter, antennae 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 2.8­3.8. Antennal article 2 longer than article 3, article 4 slightly transverse, 5­10 transverse, last article longer than 9 and 10 combined (as in Fig. 16View FIGURES 8 ­ 17).

Pronotum slightly transverse, width 0.41­0.44 mm, width to length ratio 1.1, wider than head (pronotal width to head width ratio 1.2); 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 or four weak and short carinae in front of posterior margin, posterior margin convex ( Fig. 72View FIGURES 72 ­ 76). Male sternum 8 with convex posterior margin ( Fig. 73View FIGURES 72 ­ 76).

Female tergum 8 with convex posterior margin ( Fig. 74View FIGURES 72 ­ 76), posterior margin of sternum 8 concave medially ( Figs. 75­76View FIGURES 72 ­ 76).

Aedeagus as in Figs. 77 ­85, 87­ 93View FIGURES 77 ­ 80View FIGURES 81 ­ 93. Apex of median lobe in ventral view with apical process ( Figs. 77­78View FIGURES 77 ­ 80), in lateral view bent ventrally ( Figs. 79­80View FIGURES 77 ­ 80), distal diverticula of internal sac with numerous denticles ( Figs. 81, 84, 91­92View FIGURES 81 ­ 93), in ventral view narrow ( Figs. 84­85View FIGURES 81 ­ 93), in lateral view broad ( Figs. 91­92View FIGURES 81 ­ 93).

Spermatheca as in Fig. 86View FIGURES 81 ­ 93.

Distribution. Known from the Graveyard Ridge and Black Balsam Knob in the Great Balsam Mountains – Pisgah Ridge massif (North Carolina) ( Figs. 338View FIGURE 338, 340View FIGURE 340).

Natural History. Geostiba graveyardensis  was collected by sifting forest litter at altitudes from 1500 m to 1800 m in pure conifer or mixed forest with red spruce ( Picea rubens  ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Geostiba

Loc

Geostiba (Sibiota) graveyardensis Pace, 1997

Gusarov, Vladimir I. 2002
2002
Loc

Geostiba (Ditroposipalia) graveyardensis

Pace 1997: 102