Seeversiella tuberculicauda Gusarov

Gusarov, Vladimir I., 2003, A revision of the genus Seeversiella Ashe, 1986 (Coleoptera: Staphylinidae: Aleocharinae), Zootaxa 142, pp. 1-102 : 34-36

7. Seeversiella tuberculicauda Gusarov , sp. n. ( Figs. 105­116 )

Type material. Holotype ,, MEXICO: Veracruz: 2.3 km S Jalapa, 1320 m, streamside litter (J.S.Ashe), 13.vii.1992 ( KSEM).

Paratypes: MEXICO: Veracruz:, same data as the holotype ( KSEM).

Diagnosis. Seeversiella tuberculicauda can be distinguished from other species of Seeversiella by having brown body; temples 1.2 times as long as eyes; glossy pronotum with weak isodiametric microsculpture; elytra longer than pronotum; wings fully developed; tergum 8 with four pairs of macrosetae; the distinct shape of aedeagus ( Figs. 110­ 115 ) and spermatheca ( Fig. 116 ).

Seeversiella tuberculicauda can be distinguished from S. globicollis and the other similar species (3, 5­6, 8, 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. 114 ); apex of median lobe in lateral view widened subapically and not emarginate on parameral side ( Figs. 112­113 ), in parameral view wide ( Figs. 110­111 ); spermatheca L­shaped with small umbilicus and straight proximal portion ( Fig. 116 ).

Description. Length 2.4 mm, pronotal width 0.49 mm. Body dark brown, legs brown.

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

In the only known male specimen the posterior angles of male tergum 3 projecting as spines twice as long as tergum 3 (measured medially), tergum 7 in basal third with medial tubercle.

Aedeagus as in Figs. 110­115 .

Spermatheca as in Fig. 116 .

Distribution. Known from Mexico ( Fig. 387 ).

Natural History. Seeversiella tuberculicauda was collected in streamside litter at altitude of 1320 m.

Figures

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

FIGURES 105 ­ 108. Abdominal segment 8 of Seeversiella tuberculicauda Gusarov, sp. n. (105 ­ 106, holotype; 107 ­ 108, paratype from Jalapa, Mexico). 105 – male tergum 8; 106 – male sternum 8; 107 – female tergum 8; 108 – female sternum 8. Scale bar 0.2 mm.

FIGURES 109 ­ 116. Genitalia of Seeversiella tuberculicauda Gusarov, sp. n. (109 ­ 115, holotype; 116, paratype from Jalapa, Mexico). 109 – apex of left paramere; 110 – median lobe, parameral view; 111 – apex of median lobe, parameral view; 112 – median lobe, lateral view; 113 – apex of median lobe, lateral view; 114 ­ 115 – details of internal sac retracted into median lobe, lateral view; 116 – spermatheca. Scale bar 0.1 mm (109, 111, 113, 116), 0.2 mm (110, 112, 114 ­ 115).