Seeversiella fusca Gusarov

Gusarov, Vladimir I., 2003, A revision of the genus Seeversiella Ashe, 1986 (Coleoptera: Staphylinidae: Aleocharinae), Zootaxa 142, pp. 1-102 : 30-32

5. Seeversiella fusca Gusarov , sp. n. ( Figs. 79­89 )

Type material. Holotype ,, MEXICO: Guerrero: 71 km NE Atoyac de Alvarez, 1700 m, flight intercept trap (J.S.Ashe), 27.vii.1992 ( KSEM).

Paratypes: MEXICO: Guerrero:, 2, same data as the holotype;, ditto but 25.vii.1992, forest litter; Oaxaca: 2,, 38.4 km N Telixtlahuaca, Hwy. 131, 1880 m, forest litter (J.S.Ashe), 19.vii.1992 (all ­ KSEM).

Diagnosis. Seeversiella fusca can be distinguished from other species of Seeversiella by having dark brown body; temples as long as eyes; glossy pronotum with weak microsculpture; elytra longer than pronotum; wings fully developed, tergum 8 with four pairs of macrosetae, the distinct shape of aedeagus ( Figs. 83­88 ) and spermatheca ( Fig. 89 ).

Seeversiella fusca can be distinguished from S. globicollis and the other similar species (3, 6­8, 10­12) with long elytra and weak pronotal microsculpture by the combination of the following characters: distal sclerites of internal sac poorly sclerotized, not dentiform or hook­shaped and have weak spicules ( Fig. 87 ); apex of median lobe in lateral view not widened subapically ( Figs. 85­86 ); spermatheca L­shaped with small umbilicus and slightly curved in the proximal portion ( Fig. 89 ).

DS – distal sclerite of internal sac.

Description. Length 2.3­2.5 mm, pronotal width 0.46­0.50 mm. Body dark brown with lighter elytra, legs brown.

In all external character states S. fusca is very similar to S. globicollis , but differs in the shape of the aedeagus and spermatheca as described in the diagnosis.

In four examined males posterior angles of tergum 3 not projecting at all or projecting as spines up to 1/3 as long as tergum 3 (measured medially), tergum 7 without medial carina or tubercle.

Aedeagus as in Figs. 83­88 .

Spermatheca as in Fig. 89 .

Distribution. Known from Mexico ( Fig. 387 ).

Natural History. Seeversiella fusca was collected in forest litter and with flight intercept traps at altitude of 1700­1900 m.

Figures

FIGURE 387. Geographical distribution of Seeversiella from Mexico to Honduras.

FIGURES 79 ­ 82. Abdominal segment 8 of Seeversiella fusca Gusarov, sp. n. (paratypes, 71 km NE Atoyac de Alvarez, Mexico). 79 – male tergum 8; 80 – male sternum 8; 81 – female tergum 8; 82 – female sternum 8. Scale bar 0.2 mm.

FIGURES 83 ­ 89. Genitalia of Seeversiella fusca Gusarov, sp. n. (paratypes, 71 km NE Atoyac de Alvarez, Mexico). 83 – median lobe, parameral view; 84 – apex of median lobe, parameral view; 85 – median lobe, lateral view; 86 – apex of median lobe, lateral view; 87 – details of internal sac retracted into median lobe, lateral view; 88 – apex of left paramere; 89 – spermatheca. Scale bar 0.2 mm (83, 85, 87), 0.1 mm (84, 86, 88 ­ 89).