Coelichneumon terebrator, Riedel & Watanabe, 2021

Riedel, Matthias & Watanabe, Kyohei, 2021, The genus Coelichneumon Thomson in Japan (Hymenoptera, Ichneumonidae, Ichneumoninae), Zootaxa 4948 (4), pp. 501-545 : 539

Coelichneumon terebrator nov. sp.

( figs 4a–e )

Holotype: ♀, JAPAN, Toyko, Hachiogi City, Mt. Takao-san , 19.vii.2008, T. Kidokoro leg., light trap (Kanagawa).

Description: ♀: Body length 12 mm. Flagellum slightly lanceolate, with 39 flagellomeres, 1 st flagellomere (without anellus) 3.6× longer than wide, 2 nd flagellomere 2.9× longer than wide, combined length 0.78× eye length, 12 th flagellomere square, flagellomeres beyond middle slightly attenuated and widened, widest flagellomeres c.1.5× wider than long. Temple moderately and roundly narrowed behind eye. OED 1.5× and OOD 1.3× ocellar diameter. Frons with fine granulation, ± shining. Face and clypeus with rather dense punctures, smooth; apical margin of clypeus slightly bulging medially. MI 0.75. Gena with scattered punctures ventrally, laterally 0.75× as wide as eye. Genal carina reaching hypostomal carina close to mandibular base.

Mesosoma covered with pale brownish hairs. Notaulus impressed in frontal 1/5 of mesoscutum. Mesoscutum densely punctate and finely granulate, but shining. Mesopleuron and metapleuron densely punctate, partly rugose; juxtacoxal carina strong. Scutellum moderately elevated, slightly wider than long, without lateral carina, with scattered punctures. Propodeum rounded. Area superomedia sickle-shaped, 1.5× wider than long, confluent with area basalis, anterior transversal carina slightly caudal to its middle. Area externa with fine granulation and few punctures. Hind coxa densely rugose-punctate, without scopa. Hind femur densely punctate, 3.6× longer than wide. 3 rd mid tarsomere slender, 1.7× longer than wide.

Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 2× their width; vein 2m-cu slightly distad its middle. Vein 1cu-a postfurcal by 2× its width.

Metasoma strongly oxypygous, slender apically. Lateral field of postpetiolus coarsely punctate, 0.4× as wide as median field, the latter with dense rugose punctures. Gastrocoelus deeply impressed. Thyridium slightly oblique, 0.9× as wide as the interval. 2 nd tergite 1.1× wider than long; 2 nd to 4 th tergites densely rugose-punctate; 2 nd and 3 rd tergites with aciculation medially. 7 th tergite about as long as wide. Seen from dorsal, ovipositor sheath widely extending behind metasomal apex, 1.0× as long as 7 th tergite.

Color: Black. Stripes on flagellomeres 8‒13, orbital spot opposite to antenna, frontal orbit (widened dorsally), stripe on vertex, spot on gena, collare and upper margin of pronotum, spot on subtegular ridge, sides of scutellum, spots on postscutellum, dorsolateral spots on 1 st to 3 rd tergites, apical margins of tergites narrowly yellowish. Legs black; fore and mid coxae with yellow spots; fore and mid tibiae ± yellowish frontally; hind femur narrowly reddish at base; hind tibia dark reddish-brown subbasally. Wings almost hyaline, pterostigma black.

♂ unknown.

Etymology: The specific name refers to the unusally long ovipositor sheath.

Remarks: This new species differs from C. gargawensis by slenderer basal flagellomeres, a slender metasomal apex, and widely extended ovipositor sheaths.

Distribution: Japan (Honshu).

Figures

FIGURES 4a–e. Coelichneumon terebrator nov. sp. (HT): a. lateral habitus, b. head from dorsal, c. propodeum, d. metasoma from dorsal, e. basal tergites.