Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae)
Author
Klopfstein, Seraina
text
Zootaxa
2014
2014-05-22
3801
1
1
143
journal article
45701
10.11646/zootaxa.3801.1.1
86799ab1-401c-405c-9122-a1e96d72fc0e
1175-5326
249944
E5F8C489-37F4-4A76-8E25-EFC65CDCA1D7
Diplazon tetragonus
(
Thunberg 1824,
Ichneumon
)
Ichneumon hortorius
Thunberg 1824
Ichneumon ustorius
Thunberg 1824
Bassus tricinctus
Gravenhorst 1829
Bassus nemoralis
Holmgren 1858
Bassus concinnus
Cresson 1868
Bassus albicoxus
Provancher 1874
Bassus amoenus
Provancher 1874
Diagnosis.
Fore wing length
3.7–5.2 mm
. Antenna in females with 16–17, in males with 16–18 flagellomeres. Face with punctures usually distinct from the background sculpture. Mesopleuron smooth and polished weakly punctate largely restricted to lower half. Propodeum with a full set of carinae enclosing basal, lateral and petiolar areas. Tergite 1 1.0–1.25 times as long as wide in females,
1.2–1.4 in
males, tergite 2
0.6–0.75 in
both sexes; tergites 2 and 3 mainly rugose and coriaceous, at most with some irregular punctures, especially on tergite 3, the area between the punctures not entirely smooth. Transverse impressions distinct on tergites 1–4. Metasoma dorsoventrally depressed.
Colouration of females.
Antenna dark brown. Head and mesosoma black, face with yellow along inner orbits, without yellow central face patch, yellow on clypeus and mouthparts, hind corner of pronotum, tegula, subtegular ridge, shoulder mark, upper mesepimeron; scutellum at least with yellow tip, usually largely yellow. Legs and coxae orange, fore coxa usually dark at extreme base; femora orange; hind tibia black-white-black banded, sometimes apical band with an orange or orange-brown area, hind tarsus dark. Metasoma black.
Colouration of males.
As in females but with yellow ventrally on scape and pedicel, antenna often orange below, yellow over entire face, spot on propleuron, epicnemium and part of mesosternum. Fore and mid coxae yellow, hind coxa mainly orange. Tergites 2 and 3 sometimes with light posterior margins, the colour of which can be light brown to orange but never entirely yellow or white.
Material examined.
Holotype
of
Ichneumon tetragonus
Thunberg
:
Sweden
, no locality data.
1♂
, at
UU
.
Holotype
of
Ichneumon hortorius
Thunberg
:
Sweden
, no locality data.
1♂
, at UU
.
Holotype
of
Ichneumon ustorius
Thunberg
:
Sweden
,
no locality data.
1♂
, at UU
.
Lectotype
of
Bassus nemoralis
Holmgren
:
Sweden
, Småland, leg. Boheman. 1♀, at
NRM
.
Austria
(1),
Denmark
(1),
Finland
(7),
France
(1),
Germany
(8),
Hungary
(50),
Norway
(1),
Russia
(3),
Spain
(1),
Sweden
(>100),
Switzerland
(>100),
Turkey
(1),
United Kingdom
(70),
USA
(1).
Distribution.
Holarctic and Oriental.
Figures.
Metasoma ♀ (
Fig. 7
B, 18A), hind wing (
Fig. 11
D), fore wing (
Fig. 12
C), clypeus (
Fig. 12
G), hind tibia (
Fig. 12
L).
Notes.
This is a rather variable taxon and might not represent a single biological species. Several taxa have already been split from
tetragonus
in the past, e.g.
D. scutatorius
and
D. pallicoxa
, and it is possible that even the remaining taxon still consists of a complex of species.