Chorinaeus femiae Ranjith & Butcher 2024, sp. nov.
Creators: name: Ranjith, A. P.
name: Butcher, Buntika A.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Chorinaeus
Chorinaeus femiae

description: Chorinaeus femiae Ranjith & Butcher sp. nov.
http://zoobank.org/ urn:lsid:zoobank.org:act: CFD14E01-C201-4BDA-9BC6-1744F710EE1D
(Figs 3–4)
Material examined. Holotype, female Thailand: Nan Province, Doi Phu Kha National Park; 19°12.236’ N, 101°04.667’ E, altitude 1,341 m.a.s.l. 10.iii.2023, Malaise trap, coll. Worapong Atsawasiramanee (CUMZ). Paratype, 1 female with same data as holotype except 3.ii.2023 (CUMZ).
Description. Female. Body length 4.5 mm, length of fore wing 3.2 mm.
Head. Head transverse in dorsal view, not narrowed posteriorly behind eyes, 1.9 × as wide as long medially (Fig. 3C), 1.2 × as wide as long medially in anterior view (Fig. 3B); frons smooth, setose (Fig. 3C); occiput smooth, setose (Fig. 3C); temple not convex, smooth dorsally, setose, 0.5 × as long as transverse diameter of eye in lateral view (Fig. 3E). Occipital carina present (Figs 3C, E). Eyes glabrous, slightly emarginated at the level of antennal sockets (Fig. 3B). Distance from lateral ocellus to eye 1.1 × diameter of ocellus. Distance between lateral ocellus 1.4 × distance from lateral ocellus to eye. Face not convex in lateral view, 1.1 × wider than long in anterior view, parallel sided, smooth, punctate, setose (Fig. 3B). Clypeal sulcus not impressed (Fig. 3B). Clypeus punctate, setose, slightly emarginated medio-posteriorly (Fig. 3B). Length of malar space equal to basal width of mandible. Mandible bidentate with longer and wider upper tooth, lower tooth acute (Fig. 3D). Antennae with 23 flagellomeres; all flagellomeres as long as wide except first and apical flagellomeres; first flagellomere 1.9 × as long as maximum width, 1.1 × as long as second flagellomere, apical flagellomere 2.6 × as long as wide.
Mesosoma. Mesosoma 1.6 × as long as high; mesoscutum smooth with a pair of pits subposteriorly, densely setose, without notauli, sides of mesoscutum with shallow groove (Fig. 3F). Scuto-scutellar groove smooth and shallow without crenulations (Fig. 3F). Scutellum as long as wide, lateral margin narrowing posteriorly, smooth, sparsely setose, sparsely punctate with distinct lateral carina extend till posterior margin (Figs 3F, 4A). Mesopleuron smooth, setose, speculum glabrous (Fig. 3E). Epicnemial carina distinct, reaching anterior margin of mesopleuron (Fig. 3E). Propodeum smooth, setose with parallel longitudinal dorsal carinae, anterior transverse carina absent, posterior transverse carina present laterally, medial sections of anterior and posterior transverse carina absent (Fig. 4A); spiracles elongate, elliptical, connected with pleural carina (Fig. 4B). Metapleuron smooth, setose, largely glabrous medially, with a few short longitudinal rugae ventrally, juxtacoxal carina complete (Fig. 3E). Fore wing 3.0 × as long as wide. Fore wing vein 1cu-a postfurcal (Fig. 4E). Hind femur 3.0 × as long as its maximum width in lateral view. Hind tibia 3.4 × as long as its maximum width. Ratio of length of hind tarsomeres 1–5, 4.3: 1.7: 1.5: 1.0: 1.6.
Metasoma. Metasoma coarsely and densely punctate-rugose (Figs 4C, D). First metasomal tergite smooth between latero-median carinae, rest rugose, 0.9 × as long as apical width, with distinct dorso-lateral, ventro-lateral and pair of latero-median carinae (Figs 4B–D). Second metasomal tergite 0.9 × as long as its apical width, without dorso-lateral carina and latero-median carinae complete (Figs 4B–D). Third metasomal tergite 0.8 × as long as its apical width, with midlongitudinal carinae distinct basally (Fig. 4D). Ovipositor sheath setose apically (Fig. 4C).
Color. Body black; scape, pedicel, face, clypeus, maxillary and labial palps, frons antero-laterally, tegula, fore and mid legs, and hind tibia except medially yellow; mandible except apically, antennal flagellomeres, wing veins, hind tibia medially, ovipositor and ovipositor sheath yellowish brown.
Male. Unknown.
Distribution. Thailand.
Biology. Unknown.
Etymology. APR dedicates this species to his friend Ms Femi E. Benny, for her unwavering support, encouragements and most importantly her enthusiastic interest towards taxonomic research.
Comparative diagnosis. The new species, C. femiae comes close to C. ryukyuensis based on the color of the head. However, the new species differs from C. ryukyuensis in having the following differences: first flagellomere 1.9 × as long as wide (1.6 × in C. ryukyuensis), first metasomal tergite sparsely punctate (rugose except smooth are between midlongitudinal carina in C. ryukyuensis), and flagellum yellowish brown (dark brown to blackish in C. ryukyuensis).
description: Published as part of Ranjith, A. P. & Butcher, Buntika A., 2024, First record of the genus Chorinaeus Holmgren, 1858 (Hymenoptera: Ichneumonidae) from India and Thailand with the description of two new species, pp. 283-290 in Zootaxa 5463 (2) on pages 287-290, DOI: 10.11646/zootaxa.5463.2.8, http://zenodo.org/record/11611067