Seeversiella geostiboides Gusarov

Gusarov, Vladimir I., 2003, A revision of the genus Seeversiella Ashe, 1986 (Coleoptera: Staphylinidae: Aleocharinae), Zootaxa 142, pp. 1-102 : 86-89

publication ID

https://doi.org/ 10.5281/zenodo.156420

DOI

https://doi.org/10.5281/zenodo.6274691

persistent identifier

https://treatment.plazi.org/id/62088784-C37B-C728-E12E-764AFED2FE36

treatment provided by

Plazi

scientific name

Seeversiella geostiboides Gusarov
status

 

25. Seeversiella geostiboides Gusarov View in CoL , sp. n. ( Figs. 344­355 View FIGURES 344 ­ 347 View FIGURES 348 ­ 355 )

Type material. Holotype ,, COSTA RICA: Cartago: 2.0 km E Villa Mills, 9°34'00"N 83°41'50"W, 2750 m, oak forest litter (R.Anderson), 15.ii.1998 ( KSEM).

Paratypes: COSTA RICA: Cartago:, same data as the holotype ( KSEM).

Diagnosis. Seeversiella geostiboides can be distinguished from other species of Seeversiella by having uniformly brown body; small eyes (temples 3.5­4.0 times as long as eyes); pronotal pubescence in lateral portions of the disc directed posteriorly; elytra much shorter than pronotum; reduced wings (shorter than elytra); by lacking clear medial emargination at the posterior margin of male tergum 8 ( Fig. 344 View FIGURES 344 ­ 347 ); tergum 8 with four pairs of macrosetae; by the distinct shape of aedeagus ( Figs. 348­354 View FIGURES 348 ­ 355 ) and spermatheca ( Fig. 355 View FIGURES 348 ­ 355 ).

Seeversiella geostiboides can be distinguished from S. impressicollis by not asperate pronotal punctation; in males pronotum without broad medial impression, lateral portions of posterior margin of tergum 3 extending as short and blunt projections (as in Fig. 19 View FIGURES 17 ­ 19 ), and tergum 7 with medial carina; the apex of median lobe in parameral view more rounded ( Figs. 348­349 View FIGURES 348 ­ 355 ; 311­312); and spermatheca with larger distal portion ( Figs. 355 View FIGURES 348 ­ 355 ; 320).

Seeversiella geostiboides can be distinguished from S. sulcicollis by not asperate pronotal punctation; in males pronotum without medial furrow and posterior margin of tergum 8 without denticles; the apex of median lobe without divergent carinae (in parameral view) ( Figs. 348­349 View FIGURES 348 ­ 355 ).

Seeversiella geostiboides differs from S. microphthalma and S. paramoana in having pubescence in the lateral portions of pronotum directed posteriorly; in narrower apex of median lobe (in parameral view) ( Figs. 348­349 View FIGURES 348 ­ 355 ; 335­336; 377­378); and different shape of the distal portion of spermatheca ( Figs. 355 View FIGURES 348 ­ 355 ; 341; 381).

Seeversiella geostiboides differs from S. flavida and S. adusta in having pubescence in the lateral portions of pronotum directed posteriorly; tergum 8 with four pairs of macrosetae; and different shape of the distal portion of spermatheca ( Figs. 355 View FIGURES 348 ­ 355 ; 358; 371).

Description. Length 2.6 mm. Body uniformly brown.

Head surface glossy, with fine and weak isodiametric microsculpture, with fine and poorly visible punctation, distance between punctures equals 2 times their diameter. Temples 3.5­4.0 times as long as eyes. Antennal article 2 as long as 3, article 4 slightly transverse, 5­10 transverse (ratio 1.6­2.0).

Pronotum slightly transverse, 1.3 times as wide as head, width 0.47­0.50 mm, length 0.43­0.46 mm, width to length ratio 1.1, surface glossy, with fine isodiametric microsculpture, with fine punctation, distance between punctures equals 1­2 times their diameter. Pronotal pubescence in lateral portions of the disc directed posteriorly. Elytra wider and much shorter (measured from humeral angle) than pronotum (pronotal length to elytral length ratio 1.4), 1.8 times wider than long, glossy, with poorly visible microsculpture, with fine and asperate punctation, distance between punctures equals 1­2 times their diameter, punctures stronger than on pronotum. Wings reduced to short vestiges, shorter than elytra.

Abdominal terga glossy, terga 3­5 with microsculpture consisting of transverse meshes, and with fine punctation, distance between punctures equals 2­3 times their diameter; tergum 7 with microsculpture consisting of isodiametric or transverse meshes and with fine and sparse punctation, distance between punctures equals 3­7 times. Apical margin of tergum 7 without white palisade fringe. Tergum 8 with four pairs of macrosetae ( Figs. 344, 346 View FIGURES 344 ­ 347 ).

In the only known male the posterior angles of tergum 3 not projecting as spines, lateral portions of posterior margin slightly extending as short and blunt projections (as in Fig. 19 View FIGURES 17 ­ 19 ); tergum 7 in front of posterior margin with medial carina 2/3 as long as the tergum; posterior margin of tergum 8 without clear medial emargination ( Fig. 344 View FIGURES 344 ­ 347 ).

Aedeagus as in Figs. 348­354 View FIGURES 348 ­ 355 . Apex of paramere narrow, proximal seta approximately as long as the other three setae ( Fig. 352 View FIGURES 348 ­ 355 ).

Spermatheca as in Fig. 355 View FIGURES 348 ­ 355 .

Distribution. Known from Cerro de la Muerte, Costa Rica ( Fig. 389 View FIGURE 389 ).

Natural History. Seeversiella geostiboides was collected in forest litter at altitude of 2750 m.

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