Mesochorus (Stictopisthus) fuscomaculatus Riedel 2023, nov. sp

Autor: Riedel, Matthias
Rok vydání: 2023
Předmět:
DOI: 10.5281/zenodo.7675022
Popis: Mesochorus (Stictopisthus) fuscomaculatus nov. sp. (Figs 2E, 9E, 17G, 22I) Holotype. (♀) C Vietnam: Ha Tinh, Vu Quang N.P., 141 m, N 18°17´39´´ E 105°25´30´´, 5.iii–15.iv.2011, Mal. trap 16, C. v. Achterberg, RMNH´11 (Leiden). Paratypes. (♀) C Vietnam: Ha Tinh, Vu Quang N.P., 66 m, N 18°19´47´´ E 105°26´28´´, 4.iii. –15.iv.2011, Mal. trap 9, C. v. Achterberg, RMNH´11 (coll. Riedel); (♀) C Vietnam: Ha Tinh, Vu Quang N.P., 100 m, N 18°17´46´´ E 105°25´29´´, 5.iii. –15.iv.2011, Mal. trap 11, C. v. Achterberg, RMNH´11 (Leiden). Etymology. The species name refers to the brownish (Latin “fuscus” for “brownish”) maculae on the mesoscutum. Description. ♀: Body length 3.6-4.0 mm. Fore wing 3.1-3.2 mm. Head. Flagellum with 29 flagellomeres; 1 st flagellomere 4.9 × longer than wide and 1.4 × longer than 2 nd flagellomere, 0.6 × as long as eye; 2 nd flagellomere 3.7 × longer than wide; preapical flagellomere c 1.8 × longer than wide. Occipital carina complete medially. Temple distinctly and roundly narrowed behind eye, dorsally c 0.4 × as long as eye. OED 1.6 × and OOD 0.5 × ocellar diameter. Frons almost smooth medially and with microsculpture laterally, with shallow triangular elevation below anterior ocellus. Face (Fig. 9E) coarsely punctate, width 1.2 × combined length of face and clypeus and 1.1 × eye length; inner eye margins parallel ventrally. Subantennal transverse carina not dipped medially. Malar space and ventral 0.2 of facial orbit finely striate. Malar space 0.8 × as long as width of mandibular base. Mandible with two equal teeth. Genal carina reaching hypostomal carina away from mandibular base, both carinae low. Mesosoma. 1.8 × longer than high. Side of pronotum largely smooth, with few very sparse punctures. Notaulus indistinct. Mesoscutum densely punctate, shining, covered with rather long setae. Mesopleuron with dense punctures fronto-dorsally and with sparse to rather dense punctures ventrally, speculum smooth. Dorsal end of epicnemial carina separated from frontal margin of mesopleuron. Metapleuron with sparse punctures. Scuto-scutellar groove rather large, 2.8 × wider than long, with c 4 weak longitudinal ridges. Scutellum rounded in profile, almost smooth. Propodeum (Fig. 17G) completely carinate. Area basalis trapezoid, about as long as wide. Area superomedia short, 1.7 × longer than wide and 0.9 × as long as area petiolaris, smooth; anterior transverse carina (costula) reaching its middle.Area petiolaris 1.1 × longer than wide. Hind femur 3.5-3.8 × longer than wide; hind metatarsus 0.6 × as long as hind tibia and 2.8 × longer than 2 nd hind tarsomere; hind claw with one visible basal tooth. Areolet shortly sessile frontally; vein 2m-cu slightly proximad or in its middle. Vein 1cu-a postfurcal by 1.0-1.2 × its length. Postnervulus intercepted in its middle. Pterostigma 2.9 × longer than wide. Hind wing with 4 distal hamuli. Nervellus of hind wing vertical. Metasoma. 1 st tergite 2.9 × longer than wide. Postpetiolus with strong longitudinal rugae. 2 nd tergite 1.3 × wider than long. Thyridium comma-shaped. Ovipositor sheath (Fig. 22I) with sparse setae, 8.1 × longer than wide, 0.6 × as long as hind tibia and 0.9-1.0 × as long as hind metatarsus, moderately bent upwards apically. Color. Flagellum ochreous or pale brown. Head reddish-yellow. Face pale yellow; palps, mandible except teeth, malar space, facial orbit and ventral half of frontal orbit cream-yellow; occiput brown dorsally. Mesosoma reddishyellow; pronotum ventrally, hind edge of pronotum and tegula cream-yellow. Mesoscutum with lateral and anteromedial brown spots (in the paratype from trap 11 mesoscutum entirely yellowish); propodeum basally ± blackish. 1 st tergite black, basally and often apically cream-yellow. 2 nd tergite yellow, with black triangular anterolateral spots (medially confluent in holotype). 3 rd tergite brownish, basally and laterally yellowish. 4 th to 6 th tergites yellowish, with ± extended brown dorsal spots. Ovipositor sheath brown. Fore and mid legs including coxae cream-yellow; hind coxa cream-yellow, with reddish dorsal spot; hind femur reddish-yellow; hind tibia cream-yellow, black in apical 0.2-0.3; hind tarsus ± ochreous distally. Pterostigma pale grey-hyaline. ♁ unknown. Taxonomical remark. The species belongs to the subgenus Stictopisthus and is characterized within this subgenus by its pale-yellow face, brownish color pattern of the mesosoma, and short area superomedia.
Published as part of Riedel, Matthias, 2023, Contribution to the taxonomy of the Southeast Asian Mesochorinae (Hymenoptera, Ichneumonidae), pp. 1-72 in Zootaxa 5245 (1) on pages 14-15, DOI: 10.11646/zootaxa.5245.1.1, http://zenodo.org/record/7673309
Databáze: OpenAIRE
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