Microlia pentamera Gusarov

Gusarov, Vladimir I., 2002, A revision of the genus Microlia Casey, 1910 (Coleoptera: Staphylinidae: Aleocharinae: Hoplandriini), Zootaxa 34, pp. 1-24 : 16-19

4. Microlia pentamera Gusarov , sp. nov. ( Figs. 49­61 )

Type material. Holotype:, COSTA RICA: San Jose, Zurquí de Moravia, 1600m, malaise (P. Hanson), v.1994 ( KSEM). Paratypes: 2, as the holotype; 2, ditto but vi.1993;, ditto but ix­x.1993 ( KSEM).

Diagnosis: Microlia pentamera can be distinguished from other species of Microlia by the shape of the aedeagus ( Fig. 53­56 ), particularly the apical process of median lobe ( Figs. 54, 56 ), double knob at posterior margin of the male tergum 3 ( Fig. 61 ) and spermatheca forming 3­4 coils ( Fig. 59­60 ).

Description: Length 1.8 mm. Head from brownish yellow to brown; pronotum from brownish yellow to light brown; elytra brown; abdominal segment 3 or segments 3­4 yellow, segments 4­7 or 5­7 yellowish brown to dark brown; legs, mouthparts and five basal antennal segments yellow, six apical segments brown.

Head surface glossy, on disk with weak isodiametric microsculpture, puncturation strong, distance between punctures ½­1 times their diameter. Eyes 2­2.5 times longer than temples.

Pronotum strongly transverse, 1.4 times wider than head, width 0.43­0.50 mm, length 0.29­0.33mm, width to length ratio 1.5, surface glossy, with weak microsculpture; puncturation as on head, distance between punctures ½­1 times their diameter. Elytra wider (0.54­0.59 mm) and longer (0.43­0.47 mm, measured from humeral angle) than pronotum (pronotal length to elytral length ratio 0.66), 1.2 times wider than long, surface glossy, with weak and poorly visible (at x70) microsculpture, puncturation as on pronotum, distance between punctures ½­1 times their diameter. Mesotarsus with 5 segments.

Abdominal terga glossy, with fine and poorly visible (at x70) microsculpture consisting of transverse meshes, with fine puncturation, distance between punctures 1­3 times their diameter.

Posterior margin of male tergum 3 raised as double knob ( Fig. 61 ). Male terga 7 and 8 with multiple longitudinal tubercles in posterior half. Posterior margin of male tergum 8 crenulate medially ( Fig. 50 ). Posterior margin of male sternum 8 with big triangular lobe; some apical microsetae bifurcate ( Fig. 49 ). Aedeagus as in Figs. 53­58 . Apical process of median lobe in lateral view straight ( Figs. 53­54 ).

Female tergum 8 with straight posterior margin ( Fig. 52 ). Posterior margin of female sternum 8 extended as short pointed lobe ( Fig. 51 ). Spermatheca with rounded capsule and forming three­four coils ( Fig. 59­60 ). No female accessory sclerites.

Distribution: Known from a single locality in Costa Rica ( Fig. 80 ).

Natural History: Microlia pentamera was collected with malaise trap.

Figures

FIGURE 80. Geographical distribution of Microlia Casey. 1 – M. silacea (Erichson); 2 – M. meticola (Casey); 3 – M. azteca (Casey); 4 – M. pentamera Gusarov, sp. nov.; 5 – M. tetramera Gusarov, sp. nov.; 6 – M. panamensis Gusarov, sp. nov.

FIGURES 49 ­ 52. Details of Microlia pentamera Gusarov, sp. nov. (49 ­ 50 – holotype; 51 ­ 52 – paratype). 49 – male sternum 8; 50 – male tergum 8; 51 – female sternum 8; 52 – female tergum 8. Scale bar 0.2 mm.

FIGURES 53 ­ 61. Details of Microlia pentamera Gusarov, sp. nov. (53 ­ 58, 61 – holotype; 59 ­ 60 – paratypes). 53 – median lobe of aedeagus, lateral view; 54 – apex of median lobe of aedeagus, lateral view; 55 – median lobe of aedeagus, ventral view; 56 – apex of median lobe of aedeagus, ventral view; 57 – copulatory piece of internal sac; 58 – apical lobe of right paramere, internal view; 59 ­ 60 – spermatheca; 61 – abdominal segment 3, dorsal view. Scale bar 0.2 mm (53, 55, 59 ­ 60), 0.1 mm (54, 56 ­ 58), 0.55 mm (61).