Eleusis ecuadoriensis, 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 : 281-282

Eleusis ecuadoriensis spec. nov.

urn:lsid:zoobank.org:act:774F9A2D-25FE-426C-8A32-C52AB801876B

Figs 14 A-C,29F

Type material: male, Holotype: Ecuador: Napo Prov., Cosanga env., Yanayacu-Rio Perdido Tr. (0°35'S, 77°53'W), 2100 m elev., under bark of dead tree, 26.11.2009, leg. L. Sekerka & K. Stajerová ( BMNH).

Diagnosis: E. ecuadoriensis is still longer than E. castanea , which are both the largest species of the E. humilis -group. It resembles E. castanea not only in size and shape, but also in colouration. The elytra have the same reddishbrown colouration as in E. castanea . Punctation and microsculpture are also extremely similar. The antennae of E. ecuadoriensis are slightly longer than those of E. castanea . Whereas they are as long as head and pronotum combined in E. ecuadoriensis , in E. castanea they are only as long as head and half of pronotum combined. Without dissection of the aedeagus the separation of the two species is difficult. In E. castanea the aedeagus is stout, the apical part of the central lobe is short and the transparent lobe of the paramere is distinctly widened. In E. ecuadoriensis , the aedeagus is slenderer, the apical part is longer and the transparent lobe of the paramere is only slightly widened.

Description: Length: 6.3 mm. Colouration: black; elytra reddish-brown; legs light brown; antennae dark brown.

Head: 0.79 mm long, 0.83 mm wide; eyes slightly prominent; postocular part wider than preocular part; temples approximately twice as long as eyes; nearly parallel; preocular part to base of antennae parallel; anterior margin of clypeus convergent; supraocular groove deep and wide; punctation weak and irregularly dense; on average, interstices between punctures between two to four times as wide as diameter of punctures; setiferous puncture at each end of supraocular groove; another pair of setiferous punctures on each side of prominent central part of clypeus; elongate microsculpture dense, but not deep; transversely striate on clypeus; longitudinally striate on vertex; surface slightly shiny.

Antennae as long as head and pronotum combined; first antennomere slightly thicker than following antennomeres; more than twice as long as second; third antennomere one third longer than second; following antennomeres slightly increasing in width and decreasing in length; fourth to eighth antennomere longer than wide; ninth and tenth antennomere approximately quadrate; fourth to eleventh antennomere pubescent; all antennomeres with apical setae.

Pronotum: 0.70 mm long, 0.86 mm wide; widest shortly behind anterior angles; sides in posterior two third smoothly narrowed to posterior angles; in posterior third, interrupted by sharp emargination; posterior angles obtuse; short grooves at anterior angles; punctation as dense and deep as on head; two setiferous punctures in each groove at anterior angles; additional setiferous punctures along lateral margin; lateral interruption marked by setiferous puncture in moderately deep impression; at anterior margin close to anterior angles, with impressions and setiferous punctures on each side of midline; elongate microsculpture as deep and dense as on head; circularly striate at anterior angles; longitudinally striate on disc; surface slightly shiny.

Elytra: 1.07 mm long, 1.01 mm wide; humeral angels nearly rectangular; sides slightly divergent to posterior angles; posterior angles rounded; punctation and microsculpture as dense and deep as on head and pronotum; elongate microsculpture longitudinally striate; one setiferous puncture in central position on each side of suture; several setiferous punctures along lateral margin; surface slightly shiny.

Abdomen weakly punctate; on each segment, with row of setiferous punctures; isodiametric microsculpture moderately deep.

Aedeagus slender; in lateral aspect, continuously narrowed to nearly acute apex; in ventral aspect, parallel with triangular apex; in central position of central lobe with large approximately triangular prominence; few sensillae at apex; several sensillae at central prominence; parameres slightly shorter than central lobe; slender; apical transparent lobe nearly as wide as basal scape; long seta at apex of transparent lobe; without short setose fringe; several minute sensillae close to transparent lobe and at base of scape.

Etymology: The species name derived from the country

Ecuador, where it was collected.

Figures

Fig. 13–17: Eleusis rufipennis (13); E. ecuadoriensis (14), Eleusis breviceps (15), E. insignis (16), E. scita (17); aedeagus in lateral (A)