Eleusis genieri, 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 : 283

Eleusis genieri spec. nov.

urn:lsid:zoobank.org:act:BAA0CF84-6884-461A-877A-44CA8B6B544A

Figs 12 A-C,29D

Type material: male, Holotype: Bolivia: Cochabamba, Cochabamba, 67.5 km NE Est. Biol. Valle del Saijta, Univ. de San Simon (64°47.52'W, 17°06.33'S), 300 m elev., flight intercept trap, 9- 13.2.1999, leg. F. Genier, #BOL1G99068 ( KNHM).

Diagnosis: E. genieri resembles E. rufipennis in size and colouration. It is distinctly smaller than E. castanea with similar colouration. It can be differentiated from E. rufipennis by the colouration of the elytra. E. genieri has a dark spot at the posterior margin of the elytra, whereas E. rufipennis has a triangular dark spot at the base of the elytra. However, the two species are mainly differentiated by the structure of the aedeagus. In lateral aspect, the aedeagus of E. genieri is thick with acute apex, whereas the aedeagus of E. rufipennis is distinctly curved of nearly semi-lunar shape.

Description: Length: 4.2 mm. Colouration: blackish; elytra light brown with darkened posterior half; legs and antennae light brown.

Head: 0.51 mm long, 0.54 mm wide; eyes slightly prominent; temples approximately as long as eyes; behind eyes shortly parallel; narrowed in wide smooth curve to neck; preocular sides shortly parallel to base of antennae; narrowed in sinuate curve to front margin of clypeus; supraocular groove nearly twice as long as eyes; with setiferous puncture at each end of groove; punctation deep and moderately dense; on average, interstices between punctures as wide as to twice as wide as diameter of punctures; elongate microsculpture deep; anterior clypeus diagonally striate; on posterior clypeus with wavy striae; on vertex longitudinally striate; surface slightly shiny.

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

Pronotum: 0.46 mm long, 0.57 mm wide; widest close to anterior angles; anterior half smoothly rounded; posterior half continuously narrowed to posterior angles; anterior and posterior angles obtuse; posterior margin approximately half as wide as at anterior angles; lateral margin interrupted in posterior half; interruption marked by deep setiferous puncture; on each side three setiferous punctures close to anterior angles; in anterior half along lateral margin few more setiferous punctures; punctation as deep, but slightly sparser than on head; on average, interstices between punctures two to three times as wide as diameter of punctures; with narrow impunctate midline; elongate microsculpture as dense and deep as on head; microsculpture on disc longitudinally striate; close to anterior angles, circular striae; surface slightly shiny.

Elytra: 0.74 mm long, 0.68 mm wide; sides slightly divergent to posterior angles; humeral angles nearly rectangular; posterior angles obtuse; punctation as deep and dense as on pronotum; on centre of disc, one setiferous puncture on each side of suture; elongate microsculpture deep and dense; striae elongate; surface slightly less shiny than on head and pronotum.

Abdomen with transverse microsculpture; punctation weak and sparse; few setiferous punctures on each segment in transverse row.

Aedeagus thick; in lateral aspect with apical process and thick prominence shortly in front of apex; in ventral aspect, approximately parallel; at thick process with numerous sensillae; parameres thick with widened apex and wide apical transparent lobe; at apical margin of transparent lobe with minute sensillae and one larger setiferous sensilla.

Etymology: the species name derived from its collector F. Genier, who collected extensively in the Andean region.

Figures

Fig. 7–12: Eleusis fauveli (7), E. hondurana (8), E. nigrita (9), E. indica (10), E. castanea (11), E. genieri (12); aedeagus in lateral (A)