Ctenopelma labiatum 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 : 4-8

Ctenopelma labiatum Sheng, Sun & Li sp. nov.

urn:lsid:zoobank.org:act:AB886000-ED3E-4732-B3D9-501905724244

Figs 1–11

Diagnosis

Labium large, ligula long and conspicuously exposed below mandible. Areolet very small, with long stalk (1.7 × as long as height of areolet). Median longitudinal carina of propodeum (between posterior transverse carina and anterior margin) parallel ( Fig. 8 ). Ovipositor sheath ( Fig. 11 ) wide, ovoid, about 2 × as long as its width, without dorsoapical emargination. Metasoma almost entirely yellowish brown. Apical half of antenna yellow ( Fig. 1 ).

Etymology

The specific name is derived from the large labium.

Material examined

Holotype

CHINA • ♀; Ningxia Hui Autonomous Region, Mt. Liupan ; 9 Jul. 2005; interception trap; GSFGPM.

Description

Female

MEASUREMENTS. Body length approximately 10.3 mm. Fore wing length approximately 7.6 mm. Ovipositor sheath length approximately 0.5 mm.

HEAD. Inner orbits almost parallel, slightly impressed nearby antennal socket. Face ( Fig. 2 ) approximately 1.5 × as wide as long, with dense shallow punctures; upper margin with median small longitudinal tubercle. Clypeus approximately 2.8 × as wide as long, smooth, with fine, sparse punctures; median portion of apical margin concave. Mandible with large shallow elongate punctures and buff setae; upper tooth approximately as long as lower tooth. Malar space coriaceous. Malar space approximately 0.2 × as long as basal width of mandible. Gena ( Fig. 3 ) with indistinct fine punctures and grey hairs, evenly convergent backwardly. Vertex ( Fig. 4 ) with texture as that of gena. Postocellar line approximately 0.8 × as long as ocular-ocellar line. Antenna with 34 flagellomeres; ratio of length from first to fifth flagellomeres approximately: 1.4:1.1:1.0:1.0:1.0. Occipital carina complete, genal carina reaching to base of mandible.

MESOSOMA. Anterior margin of pronotum with dense fine punctures, lateral concavity shallow, wide, with irregular short wrinkles; upper-posterior portion almost shiny, with distinct, fine punctures. Mesoscutum ( Fig. 5 ) smooth, shiny, with relative dense punctures, distance between punctures 0.2–2.5 × diameter of puncture, denser on posteriormedian portion. Anterior portion of notaulus present. Scutoscutellar groove relatively shallow, smooth. Scutellum with fine punctures, posterior portion with relative long gray setae. Mesopleuron ( Fig. 6 ) with dense irregular punctures, distance between punctures 0.2–1.5 × diameter of puncture; lower and anterior portions with relative long gray-brown setae; upper-posterior portion largely smooth and shiny. Upper end of epicnemial carina approximately reaching to 0.5 distance to subalar prominence, distant from front margin of mesopleuron. Metapleuron slightly convex, with dense indistinct punctures and long gray-brown setae. Submetapleural carina complete, strong. Wings slightly brownish, hyaline. Fore wing with vein 1cu-a distal to 1/M approximately by 0.4 × length of 1cu-a. Areolet ( Fig. 7 ) very small, its stalk approximately 1.7 × as long as 2rs-m, receiving vein 2m-cu at posterior 0.4. Vein 2-Cu approximately 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: 4.3:2.2:1.7:1.0:1.5. Basal 0.6 of claw pectinate. Median longitudinal carinae of propodeum ( Fig. 8 ) between base and posterior transverse carina parallel; lateral longitudinal carina present. Areas between median longitudinal carinae and area petiolaris smooth, with indistinct irregular wrinkles. Remainder of propodeum with relatively sparse, shallow punctures. Propodeal spiracle circular.

METASOMA. First tergite ( Figs 9–10 ) approximately 1.9 × as long as posterior width, evenly narrowed anteriorly, with distinct fine punctures; spiracle circular, small, located approximately at middle of first tergite. Second tergite ( Fig. 10 ) approximately 0.9 × as long as apical width, almost shiny, with even, fine punctures and short gray setae. Tergites 3 and 4 with sparse fine punctures. Fifth and subsequent tergites indistinctly punctate. Dorsoposterior portions of tergites 7– 8 largely concave. Ovipositor sheath ( Fig. 11 ) wide, short, approximately 2 × as long as its width, evenly and strongly narrowed posteriorly.

COLORATION ( Fig. 1 ). Black, except the following: clypeus except basal margin, mandible except base and teeth, maxillary palpi, labial palpi, tegulae, fore and middle legs except coxae, all yellowish white to brownish yellow; antennae except apical portions, upper-posterior corner of pronotum, scutellum, postscutellum and tergite 8, all yellowish to reddish brown; apical and dorsal portions of all coxae more or less brownish red; hind trochanters, femora, tibiae and basal tarsomere brown; apical margin of first tergite, second and subsequent tergites all yellowish brown with uneven, slightly dark brown portion; pterostigma brown; ovipositor sheath red-brown.

Differential diagnosis

The new species can easily be distinguished from other species of Ctenopelma by the following combinations of characters: labium large, ligula long and conspicuously exposed below mandible; areolet very small, with long stalk (1.7 × as long as height of areolet); median longitudinal carina of propodeum (between posterior transverse carina and anterior margin) parallel; basal 0.6 of claw pectinate.

Ctenopelma lapponica Holmgren, 1857 is also with areolet very small, but claws entirely pectinate in both sexes; posterior tergites of metasoma, hind coxa, trochanter and femur entirely black. The new species with second and subsequent tergites almost entirely yellow-brown, hind coxa, trochanters and femora almost entirely brown.

Figures

Figs 1–3. Ctenopelma labiatum Sheng, Sun & Li sp. nov., holotype, ♀ (GSFGPM). 1. Habitus, lateral view. 2. Head, anterior view. 3. Head, lateral view..

Figs 4–7. Ctenopelma labiatum Sheng, Sun & Li sp. nov., holotype, ♀ (GSFGPM). 4. Head, dorsal view. 5. Mesoscutum and scutellum. 6. Mesosoma, lateral view. 7. Areolet.

Figs 8–11. Ctenopelma labiatum Sheng, Sun & Li sp. nov., holotype, ♀ (GSFGPM). 8. Propodeum. 9. First tergite, lateral view. 10. Tergites 1–2, dorsal view. 11. Apical portion of metasoma, lateral view.