Alexeter flavicoxa, Li & Sun, 2022

T., Li & S. P., Sun, 2022, The genus Alexeter Förster (Hymenoptera, Ichneumonidae) in China, with descriptions of three new species, European Journal of Taxonomy 789 (81), pp. 81-103 : 84-88

Alexeter flavicoxa sp. nov.

urn:lsid:zoobank.org:act:E9DCA15D-3F5F-4044-817A-5E9275A6E69C

Figs 1–11

Diagnosis

Face ( Fig. 2 ) Approximately 1.4 × as wide as long. Malar space 0.4× as long as basal width of mandible. Areolet ( Fig. 7 ) obliquely quadrilateral, with short petiole, receiving vein 2m-cu almost at its lowerposterior corner. Lateromedian longitudinal carinae of propodeum indistinct ( Fig. 8 ); lateral side of posterior transverse carina present. First metasomal tergite ( Fig. 9 ) irregularly shagreened, 2.4× as long as posterior width. Fore and mid coxae ( Fig. 1 ) almost entirely whitish yellow.

Differential diagnosis

The new species is similar to A. niger (Gravenhorst, 1829) , but can be distinguished from the latter by the following combination of characters: areolet receiving vein 2m-cu almost at its lower-posterior corner; area petiolaris of propodeum smooth, shiny; second metasomal tergite about as long as posterior width; fore and mid coxae almost entirely whitish yellow. Alexeter niger : areolet receiving vein 2m-cu

distinctly basal of its lower-posterior corner; area petiolaris evidently rough; second metasomal tergite 1.2× as long as posterior width; fore and mid coxae almost entirely black.

Etymology

The specific name is derived from the whitish yellow fore and mid coxae.

Material examined

Holotype CHINA • ♀; Sichuan Province, Jiuzhaigou National Nature Reserve, Zechawa ; 280 m a.s.l.; 7 Jul. 2020; interception trap; GSFGPM.

Description

Female

MEASUREMENTS. Body ( Fig. 1 ). length approximately 13.4 mm. Fore wing length approximately 11.2 mm. Ovipositor sheath length approximately 0.4 mm.

HEAD. Inner orbits ( Fig. 2 ) convergent ventrally. Face approximately 1.4× as wide as long, slightly convex upper-medially, with dense fine indistinct punctures; upper margin with median emarginated and a small median tubercle. Clypeus 2.7× as wide as long; shiny, with sparse, distinct punctures and long yellowish brown setae, distance between punctures 2.0–5.0× diameter of puncture; strongly convex apically; median portion of apical margin slightly concave. Mandible with distinct punctures and long brownish yellow setae, lower tooth as long as upper tooth. Malar space 0.4× as long as basal width of mandible. Gena, vertex ( Fig. 3 ) and frons shagreened, with thin, short setae. Genae distinctly convergent posteriorly, with fine indistinct punctures. Postocellar line approximately 0.6 × as long as ocular-ocellar line. Frons slightly evenly concave. Antenna with 36 flagellomeres; ratio of length from first to fifth flagellomeres: 1.8:1.2:1.1:1.0:1.0. Occipital carina complete.

MESOSOMA. Pronotum ( Fig. 4 ) shagreened, upper portion of lateral concavity with distinct transverse wrinkles. Mesoscutum shagreened, with distinct punctures. Scutoscutellar groove smooth, shiny. Scutellum distinctly convex, with even, fine punctures. Mesopleuron ( Fig. 5 ) almost shiny, with irregular fine punctures; median portion, in front of speculum, with oblique fine wrinkles; speculum smooth. Upper end of epicnemial carina reaching front margin of mesopleuron. Metapleuron ( Fig. 4 ) evenly convex, shagreened, anterior margin smooth and longitudinally concave. Ratio of length of hind tarsomeres ( Fig. 6 ) from first to fifth: 4.5:2.1:1.6:1.0:1.3. Wings ( Fig. 7 ) slightly gray, hyaline. Fore wing with vein 1cu-a distal to M&RS by not more than 0.2× length of 1cu-a. Areolet obliquely quadrilateral, with short petiole, receiving vein 2m-cu almost at its lower-posterior corner. Postnervulus intercepted almost at middle. Hind wing vein 1-cu 2.4× as long as cu-a. Propodeum ( Fig. 8 ) evenly convex, shagreened, with dense long gray setae; basal median portion deeply narrowly concave transversely; lateromedian longitudinal carinae indistinct, lateral side of posterior transverse carina present, distinct; area petiolaris small, smooth, shiny. Propodeal spiracle circular, relatively large.

METASOMA. First metasomal tergite ( Fig. 9 ) irregularly shagreened, 2.4× as long as posterior width, evenly narrowed to base; latero-median carina almost entirely absent; spiracle circular, convex, located at 0.43 of first metasomal tergite. Second metasomal tergite ( Fig. 10 ) shagreened, evenly convex, about as long as posterior width, slightly widened posteriorly; thyridium semicircular, distance to anterior margin of second metasomal tergite less than its diameter. Third and subsequent tergites almost shiny. Ovipositor sheath ( Fig. 11 ) approximately 5.0× as long as its maximum width, almost parallel laterally. Basal portion of ovipositor ( Fig. 11 ) stout, strongly tapered to dorsal notch; apical portion beyond dorsal notch slender.

COLORATION ( FIG. 1 ). Black, except for following: face except upper median small spot, clypeus, mandible except teeth, lower portion of malar area, maxillary palpi, labial palpi, whitish yellow; upper-posterior corner of pronotum, tegula, fore and mid coxae and trochanters, hind trochantellus, posterior margins of second and subsequent tergites narrowly yellowish white. Fore and mid femora, tibiae, tarsi except fifth tarsomeres, yellowish red; basal half except basal end brownish yellow; subtegular ridge, scutellum and postscutellum slightly dark brown. Pterostigma and veins brownish black.

Male

Unknown.

Figures

Figs 1–3. Alexeter flavicoxa sp. nov., holotype, ♀ (GSFGPM). 1. Habitus, lateral view. 2. Head, anterior view. 3. Head, dorsal view. Scale bars: 1 = 2 mm; 2 = 0.2 mm; 3 = 0.1 mm.

Figs 4–8. Alexeter flavicoxa sp. nov., holotype, ♀ (GSFGPM). 4. Mesosoma, lateral view.5. Mesoscutum and Scutellum, dorsal-lateral view. 6. Hind yongtarsomeres, lateral view. 7. Wings.8. Propodeum, dorsal view. Scale bars: 4–6 = 0.2 mm; 7 = 0.5 mm; 8 = 0.1 mm.

Figs 9–11. Alexeter flavicoxa sp. nov., holotype, ♀ (GSFGPM). 9. First metasomal tergite, dorsal view. 10. Second metasomal tergite, dorsal view. 11. Apical portion of metasoma, lateral view. Scale bars: 9–10 = 0.2 mm; 11 = 0.1 mm.