The Neotropical species of the genus Osorius G - M, 1829 with remarks to the Neotropical Osoriid complex (Coleoptera: Staphylinidae: Osoriinae)
Author
Irmler, Ulrich
text
Beiträge Zur Entomologie = Contributions to Entomology
2010
2010-12-20
60
2
363
426
https://www.contributions-to-entomology.org/article/view/1782
journal article
10.21248/contrib.entomol.60.2.363-426
0005-805X
5212736
Osorius costaricensis
BERNHAUER
,, 1942: 7
(Figs 12 a-c)
Type
material examined:
Costa Rica
:
Reventazon
(
83°28' W
,
10°10' N
),
2 males
without further data (
syntypes
,
FMNH
)
.
Additional material examined:
Guatemala
:
La Union
(
89°17' W
,
14°58' N
),
3.5 km
SE, under bark,
6 specimens
,
25.6.1993
, leg.
J.S. Ashe
(
KU
,
UIC
)
;
Honduras
:
Franzisco Morazan
,
7.6 km
N Guaimaca
(
86°49' W
,
14°36' N
), under bark,
820 m
elevation,
3 specimens
,
26.6.1994
,
J.S. Ashe
(
KU
)
;
Nicaragua
:
Matagalpa
(
85°54' W
,
12°54' N
),
10 km
NW,
Selva Negra
, leaf litter at stream,
1 specimen
,
22.5.2002
, leg.
L. Herman
(
AMNH
)
;
Isla de Ometepec
(
85°34.55 W
,
11°24.71 N
),
Volcan Maderas
, ex troncos podridos,
746 m
elevation,
3 specimens
,
30.1.2000
, leg.
J. Marquez
(
UNAM
)
;
Granada
(
85°57 W
,
11°55 N
),
Res. Nat. Volcan Mombacho
, under bark,
375 m
elevation,
1 specimen
,
2.2.2000
, leg.
J. Marquez
(
UNAM
)
;
Costa Rica
:
Heredia
:
La Selva
(
84°01' W
,
10°26' N
),
3.2 km
SE Puerto Viejo
,
flight intercept trap
,
3 specimens
,
21.3.1992
,
1 specimen
,
17.2.1992
,
1 specimen
,
14.2.1992
, leg.
W. Bell
(
KU
)
;
Alajuela
:
Rio Penas Blancas
, under bark,
6 specimens
,
18.5.1989
, leg.
J.S Ashe
(
KU
,
UIC
)
;
Monteverde
,
Malaise trap
,
1 specimen
,
9.5.1989
, leg.
J.S. Ashe
(
KU
)
; Santa Elena
Puntarenas
(
82°47.85 W
,
8°55.26 N
),
Area
de proteccion,
Sierra de Talamanca
,
Selva
alta subperenifolia, troncos con hongos fumigados,
1535 m
elevation,
1 specimen
,
26.2.2000
, leg.
J. Marquez
(
UNAM
)
;
Panama
:
Bocas del Toro
,
7 km
N Boquete
,
La Culebra
trail,
5 specimens
,
15.7.1995
, leg.
A.R. Gillogly
(
KU
,
UIC
)
.
Diagnosis:
O. costaricensiscostaricensis
is one of the smallest species of Neotropical
Osorius
. In this respect it can be confused with
O. dentatus
,
O. paganus
and
O. sublaevis
. In contrast to
O. dentatus
, the surface of pronotum in
O. costaricensiscostaricensis
is matte at the distinct microsculpture, whereas surface is shiny in
O. dentatus
. In contrast to
O. sublaevis
,
punctation in
O. coastaricensiscoastaricensis
is sparser and finer. In particular, it resembles
O. paganuspaganus
in size, microsculpture and punctation.
O. costaricensis
is more slender in the overall feature than
O. paganus
,
and postocular striae are present that are absent in
O. paganus
. Moreover, the aedeagus in
O. paganuspaganus
is extremely long and acute, whereas it is shorter and with obtuse apex in
O. costaricensis
.
Description:
Length
:
6.5 – 7.8 mm
.
Colour
: black, legs and antennae brown.
Head
::
0.9 – 1.2 mm
long,
1.2 – 1.5 mm
wide; eyes not prominent, front edge of clypeus with broad, obtuse lateral prominence divided by a gap with a setiferous puncture; punctation moderately deep and dense, distance between punctures on average as wide as or 1.5 times wider than diameter of punctures; with sparse micro-punctation, microsculpture weak and isodiametric; surface shiny; on posterior portion of clypeus with two granular setiferous punctures on each side; three supraocular setiferous punctures and a pair of postocular setiferous punctures; with few short, postocular striae.
Antennae
with more or less circular 2
nd
antennomere; 3
rd
conical antennomere only slightly longer than 2
nd
; subsequent antennomeres increasing in width; 4
th
antennomere quadrate; 10
th
antennomere wider than long.
Pronotum
:
1.2 – 1.4 mm
long,
1.3 – 1.7 mm
wide; widest at anterior angles; lateral margin small at anterior angles; distinctly widened in posterior half; punctation sparser and finer than on head; distance between punctures at least twice as long as diameter of punctures; a small midline without punctures; a transverse row of five setiferous punctures along front edge and two pairs of setiferous punctures in posterior half; one pair laterad in posterior third and one pair near midline in front of posterior edge; with distinct isodiametric microsculpture; surface matte.
Elytra
:
1.4 – 1.8 mm
long,
1.3 – 1.6 mm
wide; with deep coriaceous ground sculpture; punctation nearly invisible, surface shiny.
Aedeagus
broad, nearly circular; with long apex in relation to short basal part; apex curved.