Mastrus oshimensis
Creators: name: Watanabe, Kyohei
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Mastrus
Mastrus oshimensis

description: Mastrus oshimensis (Uchida, 1930) (SJN: Ooshima-chibi-togari-himebachi)   
(Figs 2A–C)  
 Hemiteles oshimensis Uchida, 1930: 342.   
 Description. Female (n=2). Body length 4.6–5.6 mm. Body covered with silver setae.   
Head matt (Fig. 2B), 0.6 times as long as wide in dorsal view. Clypeus 0.45 times as wide as maximum length, sparsely punctate dorsally, its anterior margin narrowly marginate, with a minute median concavity. Length of malar space 0.9–0.95 times as long as basal width of mandible. OD: POL: OOL = 0.5: 0.65: 0.8. Occipital carina complete, its lower end joined with hypostomal carina distant from mandibular base. Upper tooth of mandible longer than lower tooth. Base of mandible flat. Antenna with 20–21 flagellomeres, subapical part not widened. Length of FL I 4.0 times as maximum depth of FL I in lateral view and 0.9 times as long as length of FL II.  
Mesosoma polished. Lateral part of pronotum coriaceous, sparsely punctate dorsally. Epomia present. Mesoscutum matt. Notaulus distinct and weak, its posterior end not beyond the centre of mesoscutum. Scutellum densely punctate, without a lateral longitudinal carina except for base. Mesopleuron covered with fine longitudinal striae with coriaceous surface and fine punctures except for a smooth area on speculum and its anterior area. Epicnemial carina present laterally, its dorsal end not reaching anterior margin of mesopleuron. Sternaulus present except for posterior 0.4. Posterior transverse carina of mesosternum largely absent in front of middle coxa. Metapleuron punctate, with a complete juxtacoxal carina. Propodeal carinae and areas complete. Postero-lateral corner of area densipara not projected. Area basalis as wide as area superomedia. Area superomedia longer than wide, receiving lateral section of anterior transverse carina just in front of middle (Fig. 2C). Length of fore wing 4.3–4.9 mm. Areolet absent. Vein 1cu-a slightly postfurcal to vein M&RS. Nervellus inclivous, intercepted posterior to middle. Hind femur 4.8 times as long as maximum depth in lateral view. Hind TS I: II: III: IV: V = 2.0: 0.9: 0.6: 0.35: 0.5. Tarsal claws simple.  
Metasoma. T I 1.9–2.05 times as long as maximum width, coriaceous. Median dorsal carina of T I present except for posterior part. Dorsolateral carina of T I complete. T II 0.7 times as long as maximum width, coriaceous except for smooth posterior margin. T III to T VII polished and finely punctate. Ovipositor sheath 1.3– 1.45 times as long as hind tibia. Ovipositor straight, with a weak nodus and ventral teeth.  
Coloration (Figs. 2A–C). Body (excluding wings and legs) black to blackish brown. Ventral surface of pedicel and base of FL I tinged with yellowish brown. Posterior areas of T VI and T VII white. Membranous part of metasomal sternites whitish brown. Posterior margins of T I to T V narrowly tinged with reddish yellow. Median area of T III sometimes slightly tinged with reddish brown. Ovipositor reddish brown. Wings hyaline. Veins and pterostigma brown to blackish brown except for base and apex of pterostigma yellowish brown. Legs reddish brown. Mid and hind coxae, hind trochanter, hind trochantellus, and apical part of hind tibia blackish brown to black.  
Male. Unknown.  
 Materials examined. JAPAN: SEHU (lectotype), F, “Oshima”, 2. IV. 1928, K. Sato leg.; KPM-NK 81411, F, Kanagawa Pref., Hiratsuka City, Okazaki, Hiraokanomori, 14. XI. 2018, Y. Hotta leg.   
 Distribution. Japan (Honshu and Izuoshima Is.).   
 Bionomics. Unknown.   
 Remarks. KPM-NK 81411 is the second record of this spEciEs and also thE first rEcord of this spEciEs from Honshu.
description: Published as part of Watanabe, Kyohei, 2022, Distribution Records and Re-descriptions of Some Japanese Species of the Subfamily Phygadeuontinae (Hymenoptera, Ichneumonidae), pp. 61-72 in Bulletin of the Kanagawa Prefectural Museum (Natural Science) 51 on pages 64-65, DOI: 10.5281/zenodo.13222866