Tanzawana Watanabe & Kasparyan

Watanabe, Kyohei, Taniwaki, Tooru & Kasparyan, Dmitri, 2015, Tanzawana flavomaculata (Hymenoptera, Ichneumonidae, Ctenopelmatinae), a new genus and species of parasitoid of Fagineura crenativora (Tenthredinidae, Nematinae), a serious pest of beech tree, Zootaxa 4040 (2), pp. 236-242 : 237-238

Tanzawana Watanabe & Kasparyan gen. nov.

( Figs 1–14 )

Type species: Tanzawana flavomaculata Watanabe & Kasparyan sp. nov.

Description. Body length 5.0– 6.5 mm.

Head. Clypeus weakly convex in lateral view ( Fig. 2 ), its lower margin blunt and more or less truncate ( Fig. 1 ). Face without unusually dense hairs ( Fig. 2 ). Anterior tentorial pit large ( Fig. 1 ). Eye bare ( Figs 1–3 ). Mandibular teeth with equal length ( Fig. 1 ). Occipital carina complete ( Figs 3, 4 ). Lower end of occipital carina joined with hypostomal carina and its junction distant from base of mandible ( Fig. 4 ). Occiput without strong concavity. Antenna with nearly uniformly width except for apex ( Fig. 11 ).

Mesosoma. Epomia, notaulus, sternaulus, and epicnemial carina on mesosternum absent. Base of propodeum without strong transverse concavity ( Figs 5, 7 ). Propodeum with a complete posterior transverse carina, lateral longitudinal carinae, and pleural carinae ( Figs 5, 7 ). Fore wing length 5.0– 6.5 mm. Junction of vein Cu 1 and vein cu -a far distant from junction of vein Rs + M and vein M + Cu ( Fig. 13 ). Posterior part of vein Rs + M and vein Rs +2 r curved ( Fig. 13 ). Areolet absent ( Fig. 13 ). Stigma receiving vein Rs +2 r at its basal 0.4 ( Fig. 13 ). Vein 2 m-cu with a single bulla ( Fig. 13 ). Hind wing without Cu1 ( Fig. 13 ). Vein Rs and vein M more or less indistinct on apical part of wing ( Fig. 13 ). Tooth on outer margin of apex of fore tibia reduced. Tarsal claws strongly pectinate.

Metasoma more or less soft except for first metasomal tergite. First metasomal tergite with a large, deep concavity at base ( Figs 5, 6 ). Base of first metasomal spiracle convex ( Fig. 5 ). Glymmae deep ( Fig. 7 ), those on the two sides not meeting on the translucent partition at midline. Second metasomal tergite without lateral carina and thyridium. Second and third metasomal laterotergites separated from dorsum of tergites by crease. Fourth to seventh metasomal tergites with a desclerotized part medially ( Fig. 12 ). Ovipositor sheath flat, not longer than depth of metasomal apex ( Fig. 11 ). Ovipositor robust, upcurved, with a shallow, wide, subapical dorsal notch ( Fig. 8 ).

Distribution. Palaearctic region ( Japan).

Etymology. The generic name is from the locality of type species, Mt. Tanzawa.

Bionomics. See a following type species, T. flavomaculata sp. nov.

Remarks. A basal large concavity of the first metasomal tergite may be a synapomorphy of six genera of Perilissini , i.e., Coelorhachis , Lathiponus , Sialocara , Synoecetes , Tetrambon , and Zaplethocornia ( Townes 1970) . The presence of this character indicates that Tanzawana is related to these genera.

Tanzawana can be distinguished from other genera of Perilissini by the following combination of character states: face without unusually dense hairs ( Fig. 2 ) (with dense hairs in Synoecetes ); lower margin of clypeus more or less truncate ( Fig. 1 ) (arcuate in Coelorhachis , Synoecetes , Tetrambon , and Zaplethocornia ); mandibular teeth with equal length ( Fig. 1 ) (with unequal mandibular teeth in Coelorhachis , Synoecetes , and Zaplethocornia ); occipital carina complete (dorsal part absent in Lathiponus and lateral and ventral parts absent in Sialocara ), its lower end joined with hypostomal carina and its junction is distant from base of mandible ( Figs 3, 4 ) (joined with hypostomal carina at base of mandible in Lathiponus ); occiput dorsally without strong concavity (with a large concavity in Lathiponus ); notaulus absent (sharp in Synoecetes ); tooth on outer margin of apex of fore tibia reduced (not reduced in Tetrambon ); tarsal claw pectinate (apparently simple in Synoecetes and Zaplethocornia ); median dorsal carina of first metasomal tergite short, absent posteriorly ( Figs 5, 6 ) (almost complete in Tetrambon ); ovipositor with a shallow, wide, subapical dorsal notch ( Fig. 8 ) (without notch in Zaplethocornia ).

We suggest that some apomorphic characters of Tanzawana are: 1) apical tooth on fore tibia short, 2) epicnemial carina obliterated ventrally, 3) areolet absent, 4) tarsal claws pectinate, 5) first metasomal tergite with a median basal concavity, and 6) tergites partly desclerotised.

Figures

FIGURES 1 – 10. Tanzawana flavomaculata Watanabe & Kasparyan sp. nov., female (1 – 5, 7: holotype, 8: paratype) and male (6, 9, 10: paratype) ― 1 – 4, head, frontal (1), lateral (2), dorsal (3) and posterolateral (4) view; 5 – 7, propodeum (5, 7) and matasomal tergite (5 – 7), dorsal (5, 6) and lateral (7) view; 8, ovipositor, lateral view; 9, 10, genitalia, dorsal (9) and ventral (10) view.

FIGURES 11 – 12. Tanzawana flavomaculata Watanabe & Kasparyan sp. nov., holotype, female, lateral (11) and dorsal (12) view.

FIGURES 13 – 14. Tanzawana flavomaculata Watanabe & Kasparyan sp. nov., paratype, female ― 13: fore wing; 14: hind wing.