Espeson nevermanni BERNHAUER , 1942: 4

Irmler, U., 2012, The Neotropical species of the genera Pseudespeson L, 1994 and Espeson S, 1882 (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 62 (2), pp. 331-360 : 344-345

Espeson nevermanni BERNHAUER, 1942: 4 ( Figs 10a,b , 16F )

Type material examined:

Holotype, female: Costa Rica: Hamburgfarm, Ebene Limon, unter loser Rinde , female, 4.10.1928, leg. P. Nevermann ( FMNH).

Diagnosis:

Unfortunately only the female holotype is known. The species resembles E. microphthalmus , E. adisi , and E. simplex in the absence of pronotal impressions. Compared to E. simplex , E. nevermanni is smaller in size and as long as E. adisi and E. microphthalmus . It can be differentiated from E. microphthalmus by the wider elytra and from E. adisi by the more rectangular temples.

Description:

Length: 1.8 mm. Colour: yellow. Head: 0.20 mm long, 0.33 mm wide; with eyes not prominent and temples nearly as long as eyes; fore-head nearly parallel in front of eyes; clypeus triangular; labrum with short spine in middle; punctation dense and deep; distance between punctures irregular; on average slightly smaller than diameter of punctures; neck with dense coriaceous punctation; with small impunctate midline; surface without microsculpture and shiny.

Antennae nearly as long as head and pronotum combined; 2nd antennomere globular and nearly as long as conical 3 rd antennomere; 4 th to 6 th antennomeres more or less quadrate; 7 th to 10 th antennomeres increasing in width and wider than long; except smaller 8 th antennomere.

Pronotum: 0.25 mm long, 0.34 mm wide; rounded in anterior two third; in posterior third emarginate; with small margin in posterior half in front of emargination; anterior half not margined; setiferous punctation more regular; as deep as on head, but less dense; on average distance between punctures as wide as diameter of punctures; without impression on disc; surface without microsculpture and shiny.

Elytra: 0.31 mm long, 0.38 mm wide; with smoothly rounded sides, but not distinctly wider than pronotum; punctation less dense and deep than on pronotum and surface still more shiny.

Abdomen only with segment III with deep transverse impression at base; following segments without transverse impression; setiferous punctures distinctly finer than on fore-body.

Figures

Figs 9-11: Espeson moratus (9), E. nevermanni (10); E. hermani (11); a: fore body, b: antenna, c: aedeagus, d: abdominal tergite VIII of male (scale bar: a, b: 0.5 mm, c–e: 0.1 mm).

Fig. 16: Punctation of fore-body of Espson adisi (A), E. titschacki (B), E. moratus (C), E. euplectoides (D), E. microphthalmus (E); E. nevermanni (F); scale bare 0.5 mm.