Eleusis boliviana, Irmler, 2017

Irmler, Ulrich, 2017, The Neotropical species of the genus Eleusis LAPORTE, 1835 with description of the new genus Eleusima (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 67 (2), pp. 275-318 : 279-280

Eleusis boliviana spec. nov.

urn:lsid:zoobank.org:act:63DF628A-E08F-4D9E-9518-B5C00599B8D8

Figs 5 A-C,28C

Type material: male, Holotype: Bolivia: Cochabamba Prov., Cochabamba, 109 km E Yungas (Cochabamba- Villa Tunari Rd. ) (17°8.50'S, 65°42.29'W), flight intercept tap, 1.- 6.2.1999, leg. F. Genier, #BOL1G99027 ( KNHM) ; Paratypes: 3 males with same data as holotype (2 KNHM, 1 UIC) .

Diagnosis: Regarding the small size, E. boliviana most closely resembles E. fauveli . E. boliviana is distinctly darker than E. fauveli and in this respect, it resembles E. nigerrima . In contrast to E. fauveli and E. nigerrima , the elytra are longer than wide and not quadrate or even wider than long. However, without dissection of the aedeagus, the separation from the other related species of the group is difficult. The long elongate prominence of the central aedeagal lobe clearly characterises the species.

Description: Length: 2.4 mm. Colouration: dark brown to blackish; elytra lighter brown with blackish posterior margin; legs and antennae light brown to yellow.

Head: 0.31 mm long, 0.36 mm wide; eyes large, prominent; nearly twice as long as temples; temples smoothly narrowed to neck; preocular sides shortly parallel to base of antennae; anterior margin of clypeus sinuate; apex widely curved; supraocular groove reaching from anterior edge of eyes to neck; punctation moderately deep and irregularly sparse; interstices between punctures two to four times as wide as diameter of punctures; at each end of supraocular groove with large setiferous puncture; long setae yellow; microsculpture irregularly deep; on vertex deeper than on clypeus; striae elongate; on clypeus transverse; on vertex longitudinal; close to neck diagonal; surface slightly shiny.

Antennae slightly longer than head and pronotum combined; first antennomere thicker and longer than following antennomeres; second antennomere two third as long as first; third slightly shorter than second; following antennomeres increasing in width and decreasing in length; fourth antennomere slightly longer than wide; tenth antennomere quadrate; antennomeres four to eleven pubescent and with long apical setae.

Pronotum: 0.28 mm long, 0.34 mm wide; widest at anterior angles; anterior angles smoothly curved; sides in anterior half nearly parallel; in posterior half greatly narrowed; posterior margin half as wide as at anterior angles; punctation similarly dense and deep as on vertex; more uniformly punctate than head; close to anterior angles with three larger setiferous punctures; long setae yellow; along lateral margin with few more setiferous punctures; lateral margin interrupted at middle; interruption marked by deep setiferous puncture; microsculpture similarly deep as on vertex; meshes elongate; on disc longitudinal; close to posterior angles diagonal; close to anterior angles nearly circular; surface slightly shiny.

Elytra: 0.46 mm long, 0.44 mm wide; widest close to posterior angles; humeral angles smoothly curved; punctation weaker than on pronotum, but as dense as on pronotum; one large setiferous puncture on central disc; microsculpture as deep as on pronotum; meshes longitudinal; surface slightly shiny.

Abdomen densely punctate and pubescent; among short hairs several punctures with long setae.

Aedeagus moderately broad; close to apex slightly broader than at base; apex moderately acute; with long central process reaching apex of central lobe; at base of process with several sensillae; parameres slightly shorter than central lobe; with moderately wide apical transparent lobe; at apex of transparent lobe with numerous short setae; one long seta at outer central position; at base of parameres with few sensillae.

Etymology: The species name derived from the country’s name, where it was found.

Figures

Fig. 2–6: Eleusis interrupta (2), E.humilis (3), E. nigerrima (4), E. boliviana (5), E. andina (6); aedeagus in lateral (A) and ventral (B)