Anisotacrus pulchellus Watanabe, 2024, sp. nov.
Creators: name: Watanabe, Kyohei
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Anisotacrus
Anisotacrus pulchellus

description: Anisotacrus pulchellus sp. nov.   (SJN: Hime-maru-himebachi)  
(Figs. 7A–G, 38D, 40D)  
 Type series. Holotype: JAPAN, KPM-NK 84834, F, Hyogo Pref., Tatsuno C., Shingu Town, Sano, riverside of Ibogawa, 22. IV. 2019, K. Watanabe leg. Paratypes: JAPAN, KPM-NK 84841, F, Aomori Pref., Higashidori Town, Gamanosawa, 27. V. 2012, S. Fujie leg.; KPM-NK 84839, 84840, Osaka Pref., Takatsuki City, Akitagawa-ryokuchi, 30 IV. 2011, S. Fujie leg.; OMNH, 1 F & 1 M, ditto; KPM-NK 84837, 84838, 1 F & 1 M, Ehime Pref., Saijo Town, Teizui, Kamo-jinja, 4. V. 2012, S. Fujie leg.; KPM-NK 84836, Ehime Pref., Saijo Town, Nakaoku, 5. V. 2012, S. Fujie leg.   
 Description. Female (n = 5). Body length 6.25–6.9 (HT: 6.9) mm, polished and covered with silver setae.   
Head 0.65 × as long as wide in dorsal view. Clypeus 3.0 × as broad as high, sparsely punctate and polished, lower margin rounded (Fig. 40D). Face 1.6–1.8 (HT: 1.75) × as broad as high, punctate reticulate, slightly convex medially in lateral view. Dorsal profile of gena as Fig. 38D. Frons matt and punctate, with a median sharrow groove in front of median ocellus. Occipital carina complete. Length of malar space 0.5–0.6 (HT: 0.6) × as long as basal width of mandible. Ocelli small (Fig. 38D). POL 1.1–1.25 (HT: 1.25) × as long as OD. OOL 1.8–2.1 (HT: 1.95) × as long as OD. Antenna with 33–34 (HT: 34) flagellomeres. FL I 5.7× as long as maximum depth, 1.65 × as long as FL II.  
Mesosoma. Pronotum punctate dorsally, rugose ventrally, without epomia. Mesoscutum punctate, with weak notaulus, area around notaulus partly rugulose. Scutellum finely and sparsely punctate. Epicnemial carina present laterally and ventrally, its dorsal end situated near anterior margin of mesopleuron. Mesopleuron with oblique and transverse rugae near speculum (Fig. 7C). Speculum with large smooth area (Fig. 7C). Propodeum irregularly rugulose (Fig. 7D). Lateromedian longitudinal carina present except for posterior part, largely subparallel. Lateral longitudinal carina absent anteriorly. Anterior transverse carina and posterior transverse carina absent. Area petiolaris united with area superomedia. Fore wing length 5.1–5.5 (HT: 5.3) mm. Areolet present, shortly petiolated anteriorly, received vein 2m-cu slightly based of the outer angle (Fig. 7E). Fore wing vein 1cu-a interstitial to vein M&RS. Nervellus inclivous, intercepted posterior the middle. Tarsal claws simple. Hind femur 4.4–4.5 (HT: 4.4) × as long as maximum depth in lateral view. Ratio of length of hind first to fifth tarsomeres 3.8–4.0 (HT: 3.8): 2.0: 1.4–1.6 (HT: 1.4): 1.0–1.1 (HT: 1.0): 1.3.  
Metasoma matt. T I 2.0–2.15 (HT: 2.0) × as long as maximum width, base of spiracle weakly convex. T II 0.75–0.85 (HT: 0.85) × as long as maximum width. Ovipositor sheath 0.2 × as long as hind tibia.  
Colouration (Figs. 7A–E). Body (excluding wings and legs) black. A pair of markings along frontal orbit, a pair of large triangle markings of face, mandible except for teeth, ventral sides of scape and pedicel, postero-dorsal corner of pronotum, and tegula yellow. Lower part of clypeus, palpi, and flagellum yellowish brown. Malar space sometimes weakly tinged with yellow. Metasoma reddish brown except for base of T I, subapical part of T I, basal part of SI, T V to T VII more or less tinged with blackish brown. Wings hyaline. Veins and pterostigma brown to yellowish brown except for yellow wing base. Fore and mid legs reddish brown except for coxae, trochanters and trochantelli partly to entirely yellow. Hind coxa black except for apex narrowly tinged with yellowish white. Hind trochanter and femur reddish yellow to reddish brown. Hind trochantellus, tibia, and tibial spurs whitish yellow except for apical part of tibia blackish brown. Hind tarsus blackish brown, usually base of TS I more or less tinged with whitish yellow.  
 Male (n = 3). Similar to female. Clypeus 2.5–2.8 × as broad as high. Face 2.0–2.05 × as broad as high. OOL 1.55–1.7 × as long as OD. T II 0.9–1.0 × as long as maximum width. FL I 5.0–5.7× as long as maximum depth, 1.6–1.65 × as long as FL II. Hind femur 4.45–4.8 × as long as maximum depth in lateral view. Dorsal part of clypeus yellow (Fig. 7G). Yellow area of face and fore and mid coxae larger than female. Reddish brown area of metasoma smaller than female, T I, T V to T VII usually nearly entirely blackish brown to black (Fig. 7F).   
 Distribution. Japan (Honshu and Shikoku).   
 Bionomics. Host unknown. Holotype collected in open riverbed grassland.   
 Etymology. The specific name is from Latin “ pulchellus ” (pretty and beautiful).   
 Remarks. This species resembles An. iyoensis but can be distinguished by the T I 2.0–2.15 × as long as maximum width (approximately 3.0 × in An. iyoensis) and the colouration (see above key).
description: Published as part of Watanabe, Kyohei, 2024, Taxonomic Study of Japanese Ctenopelmatinae (Hymenoptera, Ichneumonidae), with Descriptions of 22 New Species, pp. 39-102 in Bulletin of the Kanagawa Prefectural Museum (Natural Science) 53 on pages 49-51, DOI: 10.5281/zenodo.13237363