Alexeter beijingensis Sheng

Sun, Shu-Ping, Wang, Tao, Sheng, Mao-Ling & Zong, Shi-Xiang, 2019, A new species and new records of the genus Alexeter Foerster (Hymenoptera, Ichneumonidae, Ctenopelmatinae) from Beijing with a key to Chinese species, ZooKeys 858, pp. 77-89 : 80-82

publication ID	https://dx.doi.org/10.3897/zookeys.858.35012
publication LSID	lsid:zoobank.org:pub:7AF35F44-0701-4CD4-904C-091928F3F5A5
persistent identifier	https://treatment.plazi.org/id/A36502D6-F805-4493-AFA6-4EAC2B14A464
taxon LSID	lsid:zoobank.org:act:A36502D6-F805-4493-AFA6-4EAC2B14A464
treatment provided by	ZooKeys by Pensoft
scientific name	Alexeter beijingensis Sheng
status	sp. nov.

Treatment

Alexeter beijingensis Sheng sp. nov. Figs 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7 , 8 View Figure 8 , 9 View Figures 9 , 10 View Figures 10 , 11 View Figures 11

Etymology.

The name of the new species is derived from the type locality.

Material examined.

Holotype female, Mentougou, Beijing, 20 August 2004, leg. Tao Wang and Shi-Xiang Zong (GSFGPM).

Diagnosis.

Apical portion of clypeus shiny, apical margin weakly and evenly concave. Outer profiles of middle and hind tibiae with distinct spines. Propodeum ( Fig. 7 View Figure 7 ) shagreened, area between median longitudinal carinae shiny, almost smooth; posterolateral portion with long and dense grey setae. Head, mesosoma and metasoma almost entirely black. Subbasal portions of all tibiae and median bands of middle and hind tarsi white.

Description.

Female. Body length approximately 11.5 mm. Fore wing length 10.0 mm.

Head.

Inner margins of eyes weakly indented opposite antennal sockets. Face ( Fig. 2 View Figure 2 ) 1.3 times as wide as long, uppermedian portion slightly convex; shagreened, with dense fine indistinct punctures; upper margin with a small median smooth tubercle. Clypeus ( Fig. 2 View Figure 2 ) transversely convex medially; basal portion shagreened, with indistinct short transverse wrinkle; apical portion smooth, shiny; apical margin weakly and evenly concave. Mandible with dense dark grey setae, lower tooth slightly longer than upper tooth. Malar space 0.5 times as long as basal mandibular width. Gena almost evenly convergent backward, in dorsal view approximately 0.8 times as long as width of eye. Vertex ( Fig. 3 View Figure 3 ) and frons with sculpture as that of face. Postocellar line 0.5 times as long as ocular-ocellar line. Antenna with 50 flagellomeres; ratios of lengths from first to fifth flagellomeres: 4.8:2.2:2.0:1.9:1.7; ultimate flagellomere twice as long as penultimate flagellomere. Occipital carina complete.

Mesosoma.

Pronotum shagreened, upper portion with dense fine transverse wrinkles; hind margin of lateral concavity with short transverse oblique wrinkles. Epomia indistinct. Mesoscutum ( Fig. 4 View Figure 4 ) finely shagreened, with relatively sparse shallow punctures, distance between punctures mostly subequal to one diameter of puncture. Notaulus weak, present on front half of mesoscutum. Scutoscutellar groove with dense longitudinal wrinkles. Scutellum and postscutellum finely shagreened. Mesopleuron ( Fig. 5 View Figure 5 ) with sculpture almost as that of mesoscutum, with indistinct fine punctures. Speculum very small, upper portion shagreened. Mesopleural fovea vestigial. Upper end of epicnemial carina almost reaching anterior margin of mesopleuron, at level of upper 0.6 of pronotum. Metapleuron almost flat, with sculpture as that of mesopleuron; posterior margin with short transverse wrinkles. Submetapleural carina distinct, complete. Wings ( Fig. 6 View Figure 6 ) slightly infuscate. Fore wing with vein 1cu-a distal to 1-M by 0.3 times length of 1cu-a. Areolet triangular, with long petiole, 0.4 times length of its height. 2m-cu slightly reclivous, connecting to posterior angle of areolet. Hind wing vein 1-cu 1.5 times as long as cu-a. Outer profiles of middle and hind tibiae with relative dense spines. Ratio of length of hind tarsomeres from first to fifth is 4.0:2.0:1.5:0.8:1.0. Tarsal claws simple, hind claw strongly thick and curved ( Fig. 8 View Figure 8 ). Propodeum ( Fig. 7 View Figure 7 ) with distinct posterior transverse and strong complete median longitudinal carinae, latter strongly constricted medially. Area between median longitudinal carinae shiny, with indistinct, irregular transverse oblique fine striae. Area petiolaris with irregular longitudinal wrinkles. Remainder with sculpture as that of mesopleuron. Posterolateral portion with long dense grey hairs. Propodeal spiracle circular.

Metasoma

( Figs 9 View Figures 9 - 11 View Figures 11 ). Tergites shagreened. First tergite ( Fig. 9 View Figures 9 ) 2.4 times as long as apical width; median dorsal carina absent; dorsolateral carina indistinct, almost absent; spiracle distinctly convex, located slightly before mid of the tergite. Second tergite ( Fig. 10 View Figures 10 ) 1.1 times as long as apical width. Lateral margins of tergites 3 and 5, in dorsal view, almost parallel. Third tergite 1.1 times as long as apical width. Fourth tergite 0.8 times as long as apical width. Ovipositor sheath 0.5 times apical depth of metasoma. Ovipositor ( Fig. 11 View Figures 11 ) tapered from base to apex, with a large, deep, almost quadrangular notch.

Coloration

( Fig. 1 View Figure 1 ). Black, except for the following. Apical half of clypeus, anterior side and apical portion of fore femur red brown. Dorsoposterior portion of pronotum, fore tibia, basal halves of middle and hind tibiae except bases, mid tarsomeres 3 and 4, and hind tarsomeres 2-5 white. Apicomedian portion of scutellum yellowish white. Pterostigma and wing veins brownish black.

Comparative diagnosis.

The new species is similar to A. niger (Gravenhorst, 1829) in coloration: mesosoma and metasoma black; basal and apical portions of hind tibiae black, median portions white or yellowish white, but can be distinguished from the latter by the following combinations of characters: median longitudinal carina of propodeum complete, strong (absent or indistinct in A. niger ); fore wing vein 2m-cu connecting to posterior angle of areolet (basad in A. niger ); antenna, face and tegula black (antenna yellow-brown, face and tegula yellow in A. niger ).