Monontos baikalensis, Riedel, 2020

Riedel, Matthias, 2020, Contribution to the knowledge of Ichneumoninae of Siberia and Far East Russia (Hymenoptera, Ichneumonidae), Beiträge Zur Entomologie = Contributions to Entomology 70 (2), pp. 365-386 : 382-384

Monontos baikalensis spec. nov.

urn:lsid:zoobank.org:act:FD6CE0F9-611F-4590-9511-6DBABF35EE9A

( Figs 33 , 40-42 )

Holotype:  “ Russia E Siberia, lake Baikal near Anghasolka, 6.IV.2007, leg. Berlov ” “under bark of Pinus silvestris ” (coll. Riedel).

Description: . Body length 12.3 mm. Flagellum almost filiform, with 37 flagellomeres; 1 st flagellomere 3.3x longer than wide, c. 12 th flagellomere square, widest flagellomeres c. 1.25x wider than long; preapical flagellomere square. Temple shortly parallel behind eye, moderately and roundly narrowed apcially, dorsally 0.4x as long as eye. Distance of lateral ocellus to eye 1.3x ocellar diameter. Frons rugose-punctate and granulate dorsally, smooth above antennal sockets. Face densely punctate, granulate, matte. Clypeus large, 2.1x wider than long, flat and slightly impressed centrally, with scattered punctures, shining; apical margin sharp, slightly concave medially. Gena swollen, with dense punctures ventrally. Malar space 0.9x as long as width of mandibular base. Mandible sickle-shaped, with long upper tooth, lower tooth not indicated. Genal carina complete, slightly curved inwards ventrally and reaching mandibular base, low. Hypostomal carina moderately lamelliform widened (about as wide as distal maxillary palp).

Mesosoma covered with whitish hairs. Notaulus impressed at frontal margin of mesoscutum. Mesoscutum densely punctate and granulate, matte. Mesopleuron and metapleuron densely rugose-punctate; speculum partly smooth; juxtacoxal carina present. Scutellum distinctly elevated, 1.3x wider than long, densely punctate, with lateral carina in basal half. Propodeum completely carinate, moderately sloping apically, but area superomedia on an almost horizontal plane. Area basalis with median tubercle. Area superomedia hexagonal, but concave apically, 1.2x wider than long, rugose; costula reaching its middle. Area petiolaris transversely rugose, with lateral carina. Hind coxa densely punctate, without scopa. Hind femur with dense punctures, 4.0x longer than wide. Claws not pectinate.

Areolet pentagonal, frontal distance of intercubiti 4x their width; 2 nd recurrent vein slightly distal to its middle. Nervulus interstitial.

Metasoma oxypygous. Postpetiolus strongly widened, without dorsal carina; field not clearly separated, lateral field with dense punctures, wide median field with very fine partly longitudinal aciculation and small punctures. 2 nd tergite 1.25x wider than long. Gastrocoelus distinctly impressed, with strong ridges; thyridium slightly oblique, c. 0.7x as wide as the interval. 2 nd and 3 rd tergites densely rugose-punctate, ± matte; 4 th tergite with superficial punctures, ± shining. Ovipositor sheath distinctly extending behind metasomal apex (by length of 3 rd hind tarsomere).

Color: Black. Flagellomeres 9-13, narrow frontal orbit and narrow stripes on vertex ivory. Legs black; bases of femora narrowly reddish; fore femur apically and fore tibia frontally ± yellowish. Wings hyaline; pterostigma brown.

: unknown.

Remark: The new taxon is related to Monontos niphonicus UCHIDA, 1926 and can be distinguished by its wider temple and gena, ventrally curved genal carina and widened hypostomal carina, entirely black mesosoma, and matte basal tergites.

The genus Monontos UCHIDA is actually placed in the tribe Heresiarchini ( YU et al., 2016) due to the sloping form of propodeum. As it is found in related genera such as Syspasis TOWNES or Orgichneumon HEINRICH , the large and usually halfmoon-shaped area superomedia is almost plane and horizontal and not rounded in profile as in Coelichneumon and several other typical genera of the tribe Heresiarchini . In addition, the collection date and location of this new species indicates an overwintering. This biological behaviour has also found in Orgichneumon (see below) and other genera of Ichneumonini but not in typical Heresiarchini . I therefore transfer the genus Monontos UCHIDA to the tribe Ichneumonini .

RIEDEL, M.: COntribUtiOn tO the knOWLedge OF IChneUMOninAe OF SiberiA And FAr EASt RUSSiA

43. Habitus from lateral, 44. mandible.

Figures

Figs 27–34: Scutellum and propodeum: 27. Ichneumon brevimaculatus spec. nov. : 28. Ichneumon flavocoxalis spec. nov. , 29. Ichneumon polyxanthus (KRIECHBAUMER) , 30. Ichneumon megextentensorius spec. nov. , 31. Ichneumon pilocephalus spec. nov. , 32. Ichneumon flavotibialis spec. nov. , 33. Monontos baikalensis spec. nov. : 34. Protichneumon nigriventris spec. nov.

Figs 35–40: Basal tergites of: 35. Ichneumon brevimaculatus spec. nov. , 36. Ichneumon polyxanthus (KRIECHBAUMER) , 37. Ichneumon megextensorius spec. nov. , 38. Ichneumon pilocephalus spec. nov. , 39. Ichneumon flavotibialis spec. nov., 40. Monontos baikalensis spec. nov.

Figs 41–42: Monontos baikalensis spec. nov. : 41. face, 42. Head from dorsal.– Figs 43–44: Ichneumon pilocephalus spec. nov. :