Diplazon tetragonus

Klopfstein, Seraina, 2014, Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae), Zootaxa 3801 (1), pp. 1-143: 46-47

publication ID

http://dx.doi.org/10.11646/zootaxa.3801.1.1

publication LSID

lsid:zoobank.org:pub:E5F8C489-37F4-4A76-8E25-EFC65CDCA1D7

persistent identifier

http://treatment.plazi.org/id/C1225000-FF8C-FFCB-B5BD-A677FD5DFD72

treatment provided by

Plazi

scientific name

Diplazon tetragonus
status

 

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. 7View FIGURE 7 B, 18 A), hind wing ( Fig. 11View FIGURE 11. A D), fore wing ( Fig. 12View FIGURE 12. A C), clypeus ( Fig. 12View FIGURE 12. A G), hind tibia ( Fig. 12View FIGURE 12. A 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.

NRM

Swedish Museum of Natural History - Zoological Collections

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Ichneumonidae

Genus

Diplazon

Loc

Diplazon tetragonus

Klopfstein, Seraina 2014
2014
Loc

Bassus albicoxus

Provancher 1874
1874
Loc

Bassus amoenus

Provancher 1874
1874
Loc

Bassus concinnus

Cresson 1868
1868
Loc

Bassus nemoralis

Holmgren 1858
1858
Loc

Bassus tricinctus

Gravenhorst 1829
1829
Loc

Ichneumon hortorius

Thunberg 1824
1824
Loc

Ichneumon ustorius

Thunberg 1824
1824