Seeversiella furcativentris Gusarov

Gusarov, Vladimir I., 2003, A revision of the genus Seeversiella Ashe, 1986 (Coleoptera: Staphylinidae: Aleocharinae), Zootaxa 142, pp. 1-102 : 55-58

15. Seeversiella furcativentris Gusarov , sp. n. ( Figs. 208­221 )

Type material. Holotype ,, COSTA RICA: Puntarenas: Monte Verde, 1800 m (J.Ashe, R.Brooks & R.Leschen), 5.v.1989 ( KSEM).

Paratypes: COSTA RICA: Puntarenas: 5 specimens, same data as the holotype;, ditto but 1580 m, ex Auricularia sp.;, ditto but 1520 m, flight intercept trap (J.Ashe, R.Brooks & R.Leschen), 11.v.1989; 3 specimens, ditto but 14.v.1989; 1 specimen, ditto but 9.v.1989; 1 specimen, ditto but pitfall trap, 24.v.1989; 2 specimens, ditto but 1550 m, flight intercept trap, 23.v.1989;, ditto but 1570 m, flight intercept trap, 9.v.1989; 1 specimen, ditto but 11.v.1989;, ditto but 1770 m, ex Collybia sp., 21.v.1989;, Monteverde reserve, trail near lab, flight intercept trap (C.Michalski), 3.vi.1993; 1 specimen, ditto but 1.vi.1993; 9 specimens, Monte Verde, Cerro Amigos, 1780 m, flight intercept trap (J.Ashe, R.Brooks & R.Leschen), 14.v.1989; 1 specimen, ditto but pitfall trap; 11 specimens, ditto but flight intercept trap, 21.v.1989; 12 specimens, ditto but 24.v.1989; 3 specimens, ditto but 17.v.1989; Puntarenas / Guanacaste:, Monte Verde, Cerro Amigos, 1780 m, sifted leaf litter (J.Ashe, R.Brooks & R.Leschen), 9.v.1989; 11 specimens, ditto but 1760 m, but flight intercept trap, 12.v.1989; 6 specimens, ditto but pitfall traps; 29 specimens, ditto but flight intercept trap, 10.v.1989; Guanacaste:, Guanacaste Conservacion Area, Cacao Field Station, 1400 m, wet cloud forest litter (R.S.Anderson), 12.ii.1996; Heredia: ,, Cerro Chompipe, 2 km N Monte de la Cruz, 10°05'20"N 84°04'30"W, 2000 m, berlese forest litter (R.Anderson), 12.vi.1997; 13 specimens, ditto but 2100m, flight intercept trap (S. & J.Peck), 12­27.vi.1997; San Jose: 5 specimens, Zurquí de Moravia [10°03'N 84°01'W], 1600 m, malaise traps (P.Hanson), iv.1992; 7 specimens, ditto but v.1992; 5 specimens, ditto but vi.1992; 5 specimens, ditto but vii.1992; 10 specimens, ditto but ii.1993; 6 specimens, ditto but iii­iv.1993; 36 specimens, ditto but ivv.1993; 7 specimens, ditto but ix­x.1993; 2 specimens, ditto but xi­xii.1993; 5 specimens, ditto but ii.1994; 8 specimens, ditto but iii.1994; 3 specimens, ditto but iv.1994; 3 specimens, ditto but v.1994; 9 specimens, ditto but 1­31.i.1995; 3 specimens, ditto but 1­ 30.iv.1995; 2 specimens, ditto but 1­30.ix.1995; 2 specimens, ditto but 1­30.x.1995; 1 specimen, ditto but 1­30.vi.1996;, 26 km N San Isidro, 2100 m (P.Hanson), xi.1992 ­ i.1993;,, San Antonio de Escazú, 2000 m, flight intercept trap (C. Flores & P.Hanson), 1.ix­30.x.1996; San Jose / Cartago:, km 45, Int. Amer. Hwy., 6 km NE El Empalme, 9°45'00"N 83°58'30"W, 1975 m, flight intercept trap (S. & J.Peck), 8­26.vi.1997; Cartago: 10, 26 specimens, La Cangreja, 1950 m, (P.Hanson), ix­xii.1992; 2 specimens, ditto but iii­v.1992; 17 specimens, ditto but vi­vii.1992; 2, ditto but 1450 m, malaise trap, 1.iv­30.v.1995;, Tapantí, (M.L.Jameson), 23.vi.1992; PANAMA: Chiriquí: ,, 5.6 km N Boquete, La Culebra Trail, 8°49'23"N 82°25'18"W, 1800 m, cloud forest litter (R.S.Anderson), 15.vi.1996; 3, ditto but 6.0 km NE Boquete, 8°48'N 82°26'W, 1650 m, flight intercept traps (J.S.Ashe & R.Brooks), 14­19.vi.1996 (all – KSEM).

Diagnosis. Seeversiella furcativentris can be distinguished from other species of Seeversiella by brown body; large eyes (temples as long as eyes); matte pronotum with strong microsculpture; elytra longer than pronotum; wings fully developed or partially reduced, longer than elytra; the distinct shape of aedeagus ( Figs. 212­220 ) and spermatheca ( Fig. 221 ).

Seeversiella furcativentris differs from S. scabricollis in having the apex of median lobe constricted basally (in parameral view) ( Figs. 212­213 ; 194­196).

Seeversiella furcativentris differs from S. brunnea in having straight apex of median lobe (in lateral view) ( Figs. 214­215 ; 241­242).

Seeversiella furcativentris differs from S. brevipennis in having matte pronotum; pronotal punctation not asperate; elytra longer than pronotum; and smaller median lobe with shorter apex ( Figs. 212­215 ; 226­229).

Description. Length 2.4­2.8 mm, pronotal width 0.40­0.44 mm. Body brown, with darker head and lighter legs and mouthparts.

In all character states S. furcativentris is very similar to S. scabricollis , but differs in the shape of the median lobe as described in the diagnosis.

Aedeagus as in Figs. 212­220 .

Spermatheca as in Fig. 221 .

Discussion. Despite the fact that S. furcativentris and S. scabricollis are very similar in their genitalia, the difference in the shape of the apex of median lobe is stable and no intermediate forms have been observed. In one locality both species have been collected in the same sample, which also confirms their status of separate species. The two species appear to be parapatric: S. furcativentris occurs mostly below 2000 m (has never been collected above 2100 m), while S. scabricollis occurs mostly above 2000 m (occasionally collected as low as 1450 m).

Distribution. Known from Costa Rica and Panama ( Fig. 388 ).

Natural History. Seeversiella furcativentris was collected in forest litter and with flight intercept and malaise traps, at altitudes of 1400­2100 m.

Figures

FIGURE 388. Geographical distribution of Scabricollis group in Costa Rica and Panama. Isohypses 1000 m, 2000 m and 3000 m are shown. Areas above 2000 m are grey and those above 3000 m are solid black.

FIGURES 208 ­ 211. Abdominal segment 8 of Seeversiella furcativentris Gusarov, sp. n. (208 ­ 209, holotype; 210 ­ 211, paratype, Zurquí de Moravia, Costa Rica). 208 – male tergum 8; 209 – male sternum 8; 210 – female tergum 8; 211 – female sternum 8. Scale bar 0.2 mm.

FIGURES 212 ­ 221. Genitalia of Seeversiella furcativentris Gusarov, sp. n. (212 ­ 218, 221, holotype; 219 ­ 220, paratype from Monte Verde, Costa Rica). 212 – median lobe, parameral view; 213 – apex of median lobe, parameral view; 214 – apex of median lobe, lateral view; 215 – median lobe, lateral view; 216 – apex of left paramere, 217 – details of internal sac retracted into median lobe, abparameral view; 218 – details of internal sac retracted into median lobe, lateral view; 219 – right distal sclerite of internal sac; 220 – left lateral diverticulum of internal sac, with denticulate sclerotized portion; 221 – spermatheca. Scale bar 0.2 mm (212, 215, 217 ­ 218), 0.1 mm (213 ­ 214, 216, 219 ­ 221).