Research Article |
Corresponding author: Alexey Reshchikov ( alexey.reshchikov@gmail.com ) Academic editor: Bernardo Santos
© 2017 Alexey Reshchikov, Zai-fu Xu, Hong Pang.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Reshchikov A, Xu Z-f, Pang H (2017) First record of the genus Lethades Davis, 1897 from the Oriental region, with description of a new species (Hymenoptera, Ichneumonidae, Ctenopelmatinae). ZooKeys 644: 43-50. https://doi.org/10.3897/zookeys.644.10491
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A new species of the genus Lethades Davis, 1897 (Ctenopelmatinae: Pionini), L. orientalis Reshchikov & Xu, sp. n., collected in Heishiding Nature Reserve in Guangdong Province, China, is described. This is new record of the genus from China and for the Oriental region also. The species can be distinguished from all other species of the genus by its black metasoma, the presence of an areolet on the fore wing, distinctly pectinate claws with teeth of the hind claw as high as the claw itself, and a complete longitudinal propodeal carina. A key to the world species of the genus is provided.
China, key, new species, Pionini
The genus Lethades Davis, 1897, is in the tribe Pionini and the subfamily Ctenopelmatinae (Hymenoptera, Ichneumonidae). It formerly comprised 16 described species, two of them reported from the Nearctic Region and the rest from the Palaearctic Region (
Species of Lethades have been reared from Nematinae (Hymenoptera, Tenthredinidae) of the genera Amauronematus, Nematus, Pachynematus, and Pristiphora (
The European species of Lethades Davis were reviewed by
Specimens were collected using sweep nets in the forests of Heishiding Provincial Nature Reserve, located in Fengkai County, Zhaoqing City, West Guangdong Province, bordering Guangxi, China (23°27’N, 111°53’E, 150–927 m) (
The holotype is deposited in the Hymenopteran Collection of South China Agricultural University, Guangzhou (SCAU). Images were taken using AxioCamHRc digital camera attached to Zeiss Discovery V20 microscope and stacked using Helicon Focus®. All images were further processed using various minor adjustment levels in Adobe Photoshop®. Stacked images are available in colour and high resolution at http://www.morphbank.net. Morphological terminology mostly follows
Lethades Davis, 1897: 204. Type species: Adelognathus texanus Ashmead, 1890. Monobasic.
Lethades can be distinguished from all other genera in the Pionini by the combination of the following characters: first flagellomere longer than second; second trochanter of hind leg rounded without a transverse ridge; glymma present; profile of the propodeum nearly rounded with short posterior field; dorsomedian and dorsolateral carinae of the T1 converging at base; ovipositor without subapical notch; cerci parallel-sided and protruding (
1 | Notauli distinctly impressed extending at least over the anterior 0.5 of the mesoscutum. Claws not pectinate | L. schaffneri Hinz |
– | Notauli absent or weakly impressed, not extending the anterior 0.5 of the mesoscutum. Claws pectinate | 2 |
2 | Fore wing areolet absent | 3 |
– | Fore wing areolet present | 5 |
3 | Body finely striated and weakly punctate. Fore femur and tibia uniformly red | L. amauroneinati (Hinz) |
– | Body distinctly and densely punctate, mesopleuron weakly striated. Fore femur and tibia not uniformly red | 4 |
4 | Epicnemial carina reaching anterior edge of mesopleuron. Metasomal tergites without yellow bands on posterior margins. Fore femur and tibia red, dark apically | L. schmiedeknechti Hinz |
– | Epicnemial carina not reaching anterior edge of mesopleuron. Metasomal tergites with yellow bands on posterior margins. Fore femur black, yellowish apically; fore tibia yellow | L. texanus (Ashmead) |
5 | Metasomal tergites black, or with narrow posterior margins light colored (Fig. |
5 |
– | Middle metasomal tergites red, sometimes with dark maculae | 11 |
6 | Claw distinctly pectinate, teeth of hind claw more than 0.5 times as high as claw (Fig. |
7 |
– | Hind claw with teeth less than 0.5 times as high as claw. Longitudinal propodeal carina present | 8 |
7 | Longitudinal propodeal carina mostly absent, only the area apicalis defined | L. punctatissimus (Strobl) |
– | Longitudinal propodeal carina complete (Fig. |
L. orientalis Reshchikov & Xu, sp. n. |
8 | Head with parallel sides or expanded behind eyes dorsally. T1 with distinct dorsal longitudinal carinae reaching almost to posterior margin | L. erichsonii Hinz, 1996 |
– | Head narrowed behind eyes dorsally. T1 with weak dorsal longitudinal carinae reaching only 0.7 of length | 9 |
9 | Mesopleuron polished ventrally, finely and densely punctate. Propodeum with costula defined. T2 and T3 finely sculptured, polished. Metasomal tergites with narrow yellow posterior margins. Clypeus in female entirely or apically pale. Scape yellow ventrally | L. cingulator Hinz |
– | Mesopleuron matt ventrally, shagreened or granulated | 10 |
10 | T2 and T3 with broad reddish-yellow bands on posterior margins. Pronotum, mesonotum, and mesopleuron in male with large yellow maculae. Female with clypeus and scape entirely black | L. laricis Hinz |
– | T2 and T3 black (T3 slightly reddish-brown basally). Male with pronotum, mesonotum, and mesopleuron black. Clypeus in female with yellow maculae on sides | L. buriator Aubert |
11 | Ovipositor sheath 2 times as long as first tarsomere of hind leg | L. lapponicus (Holmgren) |
– | Ovipositor sheath equal to or shorter than first tarsomere of hind leg | 12 |
12 | Temples and lower part of mesopleuron coriaceous and granulated with fine, dense punctures. T1 very densely punctate and striated, with elongate dorsal carinae reaching to its middle | L. facialis (Brischke) |
– | Temples and lower part of mesopleuron striated, punctures not defined. T1 finely shagreened, with short dorsal carinae not reaching middle | 13 |
13 | Ovipositor sheath curved upwards, as long as first tarsomere of hind leg, curved upwards. Antenna with 24–26 flagellomeres; the basal flagellomeres stout, and apical flagellomeres transverse. T1 black; T2–T4 red | L. lapponator Hinz |
– | Ovipositor sheath straight, shorter, 0.6–0.8 times as long as first tarsomere of hind leg. Antenna with 23–31 flagellomeres; the basal flagellomeres elongate, the apical flagellomeres cubic. T1 black with posterior margin red | 14 |
14 | Antenna with 28–31 flagellomeres. Female with third flagellomere 2.3–2.8 times as long as broad; male with third flagellomere 2.2–2.4 times as long as broad. Mesopleuron finely striated, finely and sparsely punctate. Body black. Palpi, mandibles, posterior edge of pronotum, and tegulae yellow. Legs (except coxae and hind tarsi), posterior margins of T1, and T2–T3 red. Male with clypeus, face, scape and pedicel ventrally, subtegular carina, fore and middle coxae and trochanters yellow | L. imperfecti Hinz |
– | Antenna with 23–28 flagellomeres. Female with third flagellomere 1.9–2.4 times as long as broad; male with third falgellomere 1.9–2.2 times as long as broad. Mesopleuron distinctly coriaceous | 15 |
15 | Mesonotum and T1–T3 finely striated | L. scabriculus (Thomson) |
– | Mesonotum and T1–T3 not striated | 16 |
16 | Mesonotum distinctly matt, finely and densely punctate | L. kukakensis (Ashmead) |
– | Mesonotum distinctly polished, sparsely and indistinctly punctate | L. curvispina (Thomson) |
Holotype, female, CHINA: Guangdong, Fengkai, Heishiding Provincial Nature Reserve (23°27'N, 111°53'E), 150–927 m., sweep net, 1–2.X.2003, leg. Zaifu Xu (SCAU).
This species can be distinguished from all other species of Lethades by a combination of the following characters: metasoma black (Fig.
Female. Body length 10.5 mm.
Head. Face and clypeus shagreened and covered with long reddish setae (Fig.
Mesosoma. Pronotum distinctly punctate. Mesoscutum with dense and distinct punctures. Notauli present. Scuto-scutellar groove with weak longitudinal wrinkles. Scutellum convex, with distinct punctures, its basal 0.3 with lateral carina. Mesopleuron (Fig.
Metasoma. Metasomal tergites shagreened, matt, finely punctate. T1 twice as long as apical broad. Dorsal carinae strongly raised, almost reaching posterior margin of T1. T2 transverse. Ovipositor sheath approximately 0.8 times as long as apical depth of metasoma, subapical portion distinctly truncated (Fig.
Color. Body mostly black (Figs
Male. Unknown.
The name of the new species refers to the Oriental Region.
The authors are deeply grateful to Dr. Qiang Yang (Sun Yat-sen University, China) and Qi Yue (South China Agricultural University) for their kind help with the image of the type specimen and Dr. Tony Hunter (National Museums Liverpool, UK), Pascal Rousse (Iziko South African Museum, Cape Town, South Africa), Ilari Sääksjärvi (University of Turku, Finland) and Bernardo Santos (American Museum of Natural History, New York, USA) for review of the manuscript. This research was supported by the National Basic Research Program of China (No. 2013CB127600) and the National Natural Science Foundation of China (No. 31171899 & No. 31572052).