Ctenopelma spiraculare Sheng, Sun & Li, 2019

Sun, Shu-Ping, Sheng, Mao-Ling & Gao, Chun, 2019, The species of Ctenopelma Holmgren (Hymenoptera, Ichneumonidae) from China, European Journal of Taxonomy 545, pp. 1-31 : 20-24

Ctenopelma spiraculare Sheng, Sun & Li sp. nov.

urn:lsid:zoobank.org:act:617516A6-22DF-426D-B320-D00F4F9DD925

Figs 43–53

Diagnosis

Upper median portion of occipital carina distinctly flange-shaped. Apical portions of wings slightly darkened. Fore wing with vein 1cu-a distal to 1/M by 0.6 × length of 1cu-a. Areolet receiving vein 2mcu approximately 0.45 × distance from vein 2rs-m to 3rs-m; 2-Cu approximately 2.3 × as long as 2cu-a.

First tergite abruptly strongly narrowed anterior of spiracle, spiracle small, strongly convex. Mesosoma, all coxae and hind femora almost entirely black.

Etymology

The name of the new species is based on the strongly convex spiracle of the first tergite.

Material examined

Holotype

CHINA • ♀; Shanxi Prov., Wanrong ; 35°19′ N, 110°47′ E; alt. 1157 m; 7 May 2012; reared from ‘cocoon’ (chamber) of Acantholyda posticalis (Matsumura, 1912) by Tao Li; GSFGPM.

Paratype

CHINA • 1 ♀; Henan Prov., Lingbao ; alt. 290 m; 11 May 2010; reared from ‘cocoon’ (chamber) of Acantholyda posticalis (Matsumura, 1912) by Tao Li; GSFGPM .

Description.

Female

MEASUREMENTS. Body length 9.3–13.3 mm. Fore wing length 8.0– 10.9 mm. Ovipositor sheath length 2.8–3.5 mm.

HEAD. Inner eye margin slightly concave opposite to antennal socket. Face ( Fig. 44 ) approximately 1.7 × as wide as long, evenly convex, almost shiny, with sparse fine punctures and yellowish brown setae; upper margin with a small median tubercle. Clypeus approximately 2.8 × as wide as long; subapical portion transverse convex, smooth, shiny; median portion of apical margin truncate. Mandible with dense, relatively long yellowish brown setae. Upper tooth almost as long as lower tooth. Malar space approximately 0.2 × as long as basal width of mandible. Gena ( Fig. 45 ) almost smooth, evenly convergent posteriorly, with fine punctures and dense gray-brown setae. Vertex ( Fig. 46 ) with sculpture as that of gena. Postocellar line approximately 0.8 × as long as ocular-ocellar line. Frons with fine punctures, between antennal socket with distinct longitudinal carina. Antenna with 43–44 flagellomeres. Ratio of length from first to fifth flagellomeres: 1.7:1.3:1.2:1.1:1.0. Occipital carina complete, upper median portion distinctly flange-shaped, lower end reaching base of mandible.

MESOSOMA. Anterior portion of pronotum shiny, with dense, fine punctures; lateral concavity smooth, shiny; dorsoposterior portion with comparatively dense fine punctures. Mesoscutum ( Fig. 47 ) shiny, with weak, uneven punctures. Notaulus indistinct. Scutoscutellar groove wide, relatively deep, smooth, shiny. Scutellum with distinct gray setae and fine, even, relatively sparser punctures than on mesoscutum. Anterior portion of postscutellum deeply concave. Anterior and upper portions of mesopleuron ( Fig. 48 ) with irregular, relatively sparse punctures; lower half with dense punctures, distance between punctures 0.2–2.0 × diameter of puncture; median portion largely smooth, shiny. Upper end of epicnemial carina approximately reaching 0.6 level of front margin of mesopleuron, distant from front margin of mesopleuron. Metapleuron almost shiny, with almost even punctures, distance between punctures 0.5–2.0 × diameter of puncture. Juxtacoxal carina absent. Submetapleural carina complete, marginate. Wings slightly gray, hyaline, apical portion slightly darkish. Fore wing with vein 1cu-a distal to 1/M by 0.6 × length of 1cu-a. Areolet large, obliquely quadrangular, receiving vein 2m-cu approximately 0.45 × distance from vein 2rs-m to 3rs-m, 2rs-m distinctly shorter than 3rs-m. 2-Cu approximately 2.3 × as long as 2cu-a. Hind wing vein 1-cu approximately 1.5 × as long as cu-a. Ratio of length of hind tarsomeres from first to fifth approximately: 5.1:2.2:1.7:1.0:1.5. Claw distinctly pectinate. Propodeum ( Fig. 49 ) evenly convex, with relatively dense, long gray setae; median longitudinal carinae behind transverse carina very weak; areae basalis, superomedia and petiolaris completely confluent, with dense transverse wrinkles; area dentipara with short, indistinct transverse wrinkles and punctures; remaining areas of propodeum with shallow, almost even punctures. Propodeal spiracle elongate-oval.

METASOMA. Petiole ( Figs 50–51 ) smooth, shiny, lateral sides almost parallel; postpetiole abruptly strongly widened, shiny, with weak punctures, lateral portion with long gray setae; spiracle circular, small, strongly convex. Second tergite ( Fig. 50 ) approximately as long as posterior width, with relatively sparse, fine punctures. Third and subsequent tergites almost shiny, with fine punctures and short brownish gray setae. Ovipositor sheath ( Fig. 52 ) approximately 9.2 × as long as maximum width, 0.8 × as long as hind tibia. Ovipositor evenly narrowed apically, with indistinct dorsal notch.

COLORATION ( Fig. 43 ). Black, except following; face except upper margin and median longitudinal spot, clypeus except median yellowish brown portion, mandibles except teeth, all yellowish white; maxillary and labial palpi, lateral spots of vertex, upper posterior corner of pronotum, fore tibia and tarsus, middle tibia, basal 0.7 of hind tibia, basal portions of middle and hind tarsomeres more or less, parts of apical portions of ovipositor sheath, all yellow; part of second tergite irregularly and indistinctly, third tergite and basal margin of fourth tergite red-brown. Tegulae and veins dark brown. Pterostigma yellowish brown.

COCOON ( Fig. 53 ). Brownish black, with a wide white ring; length approximately 14 mm; diameter approximately 5.2 mm.

Host

Acantholyda posticalis (Matsumura, 1912) .

Host foodplant

Pinus tabuliformis Carrière.

Differential diagnosis

The new species can be distinguished from other species of Ctenopelma by the following combinations of characters: first tergite from spiracle abruptly narrowed anteriorly, spiracle strongly convex; postpetiole slightly to strongly convex, length distinctly shorter than its width; second tergite shorter than its posterior width; hind wing vein 1-cu distinctly shorter than cu-a.

Figures

Figs 43–46. Ctenopelma spiraculare Sheng, Sun & Li sp. nov., holotype, ♀ (GSFGPM). 43. Habitus, lateral view. 44. Head, anterior view. 45. Head, lateral view. 46. Head, dorsal view.

Figs 47–51. Ctenopelma spiraculare Sheng, Sun & Li sp. nov., holotype, ♀ (GSFGPM). 47. Mesoscutum and scutellum. 48. Mesosoma, lateral view. 49. Propodeum. 50. Tergites 1–2, dorsal view. 51. First tergite, lateral view.

Figs 52–53. Ctenopelma spiraculare Sheng, Sun & Li sp. nov., holotype, ♀ (GSFGPM). 52. Apical portion of metasoma, lateral view. 53. Cocoon.