Eleusis peruviana, 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 : 299-300

Eleusis peruviana spec. nov.

urn:lsid:zoobank.org:act:819FB601-081E-4EEF-BAD3-2363C6D299CF

Figs 24 A-C, 30G

Type material: male, Holotype: Peru: Prov. Tama, Dept. Of Junin, Utcuyacu & Agua Dulce, III 1948, leg. F. Woytkovski ( AMNH). Paratype: Bolivia: male, Yuracaris, corticale saillant a la base (bark not attached at base) ( IRSNB) .

Diagnosis: The species is closely related to E. bicolor and E. struyvei regarding colouration. Because only two specimens are known, the variation of colouration is unknown. However, the different colour of the abdomen between holotype and paratype may indicate that the variation of the colour might be as large as in the other two species. The species can be separated from E. bicolor and E. struyvei by the uniform punctation of the head and the dense microsculpture that is still denser than in E. struyvei . The aedeagus resembles that of E. struyvei by its longitudinal shape. It is still more elongate than in E. struyvei . The apex is slightly sinuated in lateral aspect, whereas it is straight in E. struyvei . Moreover, the central groove of central lobe margined by weak ridges is absent in E. struyvei and the parameres are more elongate than in E. struyvei .

Description: Length: 11.0 – 13.0 mm. Colouration: head and pronotum black; elytra orange with blackish posterior margin; size of blackish spot slightly varying; abdomen orange with posterior abdominal segments dark brown or abdomen totally dark brown; legs light brown; antennae black.

Head: 1.29 mm long, 1.14 mm wide; eyes short; not prominent; temples more than twice as long as eyes; supraocular groove reaching from anterior edge of eyes to posterior edge of temples; preocular sides shortly parallel to base of antennae; front margin of clypeus slightly sinuate; central part prominent; punctation moderately deep and dense; size of puncture not varying; interstices between punctures between twice as wide as to four times as wide as diameter of punctures; at each end of supraocular groove with setiferous puncture; another pair of setiferous punctures at each side of prominent part of clypeus; elongate microsculpture dense, but not deep; on clypeus and vertex longitudinally striate; surface moderately matt.

Antennae as long as head and half of pronotum combined; first antennomere slightly thicker than following antennomeres; second antennomere short, approximately half as long as third; following antennomeres slightly decreasing in length; forth slightly longer than wide; tenth approximately quadrate; fourth to eleventh antennomere with long yellow setae.

Pronotum: 1.07 mm long, 1.19 mm wide; in anterior half, sides parallel; in posterior half, sides smoothly narrowed in convex curve to posterior angles; posterior margin only half as wide as anterior margin; slightly prominent; in front of posterior margin, with pair of parallel short grooves bordering prominent central part; anterior angles at grooves shortly emarginate; anterior margin sinuate; punctation as dense and deep as on head; two setiferous punctures in anterior grooves; several setiferous punctures along lateral margin; two pairs of setiferous punctures at anterior margin close to anterior angles; elongate microsculpture as dense and deep as on head; longitudinally striate; surface moderately matt.

Elytra: 1.32 mm long, 1.26 mm wide; sides slightly divergent posteriad; humeral angles and posterior angles obtusely angled; punctation as dense and deep as on pronotum; several setiferous punctures along lateral margin; one setiferous puncture in central position on each side of suture; dense elongate microsculpture weaker as on head and pronotum; surface shiner than on head and pronotum.

Abdomen with weak punctation; few setiferous punctures in transverse line of each abdominal segment; microsculpture weak; surface still shinier than on elytra.

Aedeagus elongate; moderately thick; in lateral aspect, with broad base and shortly acute apex; ventral side in front of apex slightly concave; sclerotised ventral plate of central lobe with several sensillae; in ventral aspect, slightly widened in upper central part; in apical opening with oval lobe; along midline with indistinct groove margined by weak ridges; on each side of groove with numerous sensillae; parameres slender; nearly as long as central lobe; transparent widening at apex short and narrow; with few micro-sensillae and one setiferous sensilla.

Etymology: The species is named according to the country’s name, where the holotype was found.

Figures

Fig. 24–27: E. peruviana (24), E. panamaensis (25); E. frater (26), E. elongata (27): aedeagus in lateral (A) and ventral (B) view,