The Neotropical species of the genera Pseudespeson L, 1994 and Espeson S, 1882 (Coleoptera: Staphylinidae: Osoriinae)
Author
Irmler, U.
text
Beiträge Zur Entomologie = Contributions to Entomology
2012
2012-12-20
62
2
331
360
journal article
6439
10.21248/contrib.entomol.62.2.331-360
4e2d6f56-fddc-4e28-bfd5-065db656475d
0005-805X
4812872
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.