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Research Article
A new species of Entedon Dalman (Hymenoptera, Eulophidae) and three newly recorded species from China
expand article infoMing-Rui Li‡, Cheng-De Li§
‡ Beihua University, Jilin, China
§ Northeast Forestry University, Harbin, China

Corresponding author: Cheng-De Li ( lichengde0608@sina.com )

Academic editor: Andreas Köhler
© 2023 Ming-Rui Li, Cheng-De Li.
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: Li M-R, Li C-D (2023) A new species of Entedon Dalman (Hymenoptera, Eulophidae) and three newly recorded species from China. ZooKeys 1172: 1-14. https://doi.org/10.3897/zookeys.1172.104676
ZooBank: urn:lsid:zoobank.org:pub:04577766-055D-412B-8FDE-19DD0311FD4B
Open Access

Abstract

In this paper, a new species of Entedon Dalman, E. flavifemur sp. nov. is described from Tibet and three species, E. albifemur Kamijo, E. crassiscapus Erdös, and E. nomizonis Kamijo are reported from China for the first time. A detailed description and illustrations of the new species are provided, as well as diagnoses and illustrations of the three newly recorded species.

Key words

Chalcidoidea, Entedoninae, natural enemy, new species records, parasitoid wasp, taxonomy

Introduction

Species of genus Entedon Dalman, 1820 (Hymenoptera, Eulophidae, Entedoninae) are considered to primarily parasitize the larvae of weevils, bark beetles (Coleoptera, Curculionidae), and bean weevils (Coleoptera, Chrysomelidae, Bruchinae) which bore into tree trunks, wood, and seeds (Schauff 1988; Askew 1991). The genus Entedon can be separated from other genera in Entedoninae by the following characters: head and thorax strongly sclerotized, with conspicuous reticulation; antenna usually with 3-segmented funiculus and 2-segmented clava, and sometimes with five flagellar segments separated from each other, not forming an obvious clava; frontal sulcus often absent, although well developed in some species; mandibles bidentate; scutellum convex; propodeum mostly smooth (rarely reticulate) with single median carina that may split and diverge anteriorly; propodeal spiracle on an elevated area; and fore wing with cubital setal line and basal setal line usually absent or incomplete, rarely complete (Gumovsky 1997; Majeed et al. 2021).

The genus Entedon contains 187 species worldwide, of which 185 species were recorded in the Universal Chalcidoidea Database (Noyes 2019), and two species were described more recently by Majeed et al. (2021) from India. There are 14 species known from China: seven species (E. betulae Yang, E. broussonetiae Yang, E. pini Yang, E. pumilae Yang, E. tumiditempli Yang, E. wilsonii Yang, E. yichunicus Yang) were described by Yang (1996) during an investigation of parasitic wasps on bark beetles in China; two species (E. epicharis Huang, E. zanara Walker) were reported by Wang et al. (1991), both reared from the larvae of Agrilus suvorovi Obenberger; five species (E. abdera Walker, E. gracilior Graham, E. methion Walker, E. punctiscapus Thomson, E. squamosus Thomson) were reported by Zhu and Huang (2001), Zhu and Huang (2002), and Zhang et al. (2007) during the taxonomic study on Eulophidae from Zhejiang, Guangxi, and Gansu provinces of China, respectively.

In this paper we record four additional species: E. flavifemur is described as new to science; and E. albifemur Kamijo, 1988, E. crassiscapus Erdös, 1944 and E. nomizonis Kamijo, 1988 are reported from China for the first time. The detailed description and illustrations of the new species, diagnoses and illustrations of three new recorded species are provided.

Materials and methods

Specimens were collected by sweep nets, yellow-pan traps, and Malaise traps from northeast and southwest China, and were fixed on triangular cards or dissected and mounted in Canada Balsam on slides following methods described by Noyes (1982). Photographs were taken with an Aosvi AO-HK830-5870T digital microscope or a digital CCD camera attached to an Olympus BX51 compound microscope. The quality of these images was improved by using Helicon Focus 7 and Adobe Photoshop 2020. Measurements were made using the built-in software of Aosvi AO-HK830-5870T.

Terminology follows the Hymenoptera Anatomy Consortium (2023), and the following abbreviations are used:

C1–2 clavomeres 1–2;

F1–3 funiculars 1–3;

HE height of eye;

MS malar space;

MV marginal vein;

OOL minimum distance between a posterior ocellus and corresponding eye margin;

PMV postmarginal vein;

POL minimum distance between posterior ocelli;

SMV submarginal vein;

STV stigmal vein;

WM width of mouth opening.

Type material is deposited in the insect collections at Northeast Forestry University (NEFU), Harbin, China. Abbreviations for other depositories:

EIHU Entomological Laboratory, Hokkaido University, Japan;

HNHM Hungarian Natural History Museum, Budapest, Hungary.

Taxonomic accounts

Entedon flavifemur Li & Li, sp. nov.

https://zoobank.org/B5C82D77-CB83-4C07-96D4-ED165CD8165C
Figs 1, 2A–K

Type material

Holotype : ♀ [NEFU; on card], China, Tibet, Lhasa City, Linzhou County, 30–31.V.2015, leg. Ye Chen and Chao Zhang, by yellow-pan trapping. Paratypes: 4♀: 1♀ [NEFU; on slide], China, Tibet, Medog County, Damu Village, 15–18.V.2017, leg. Zhaxi, by Malaise trapping; 2♀ [NEFU; on cards], China, Tibet, Medog County, Damu Village, 25.V.–1.VI.2017, leg. Zhaxi, by Malaise trapping; 1♀ [NEFU; on card], CHINA, Tibet, Medog County, Damu Village, 15–22.VI.2017, leg. Zhaxi, by Malaise trapping.

Diagnosis

Female. Scape and all femora and tibiae yellow to pale yellow (Figs 1, 2C, F–H); propodeum smooth, without reticulation (Fig. 2D, E); fore wing with an oval-shaped infuscate spot below MV (Figs 1, 2J); lower surface of costal cell with a row of short setae close to SMV and extending from base to 2/3 length of the cell (Fig. 2J).

Figure 1. 

Entedon flavifemur Li & Li, sp. nov., holotype, female, habitus in lateral view. Scale bar: 200 μm.

Figure 2. 

Entedon flavifemur Li & Li, sp. nov., paratype, female, on slide A, B head, frontal view C antenna D, E mesosoma F–H fore, mid and hind leg, respectively I metasoma J fore wing, red arrows show the row of short setae on lower surface K hind wing. Scale bars: 100 μm.

Description

Female. Body length 2.2–2.4 mm, mainly metallic green. Vertex and face metallic green, the latter with golden-red reflections, and interantennal area with golden-violet reflections (Fig. 2B). Eyes and ocelli dark reddish brown. Antenna with scape yellow to pale yellow, pedicel and flagellum dark brown with weak bluish green reflections (Figs 1, 2C). Mesosoma and metasoma metallic green, with golden-yellow or copper reflections (Fig. 2E). All legs with coxae metallic green; trochanters, femora, and tibiae yellow to pale yellow; first three tarsomeres white to pale yellow and 4th tarsomere brown to dark brown (Figs 1, 2F–H). Fore wing with an oval-shaped infuscate spot below MV (Fig. 2J).

Head (Fig. 2A, B), in frontal view 1.4× as wide as high. Vertex and face strongly reticulate, only clypeus smooth, and meshes of reticulate sculpture around antennal toruli smaller than other parts. Vertex along occipital margin a with distinct transverse carina. POL:OOL ~ 2.8:1.0. Frontal sulcus absent. HE:MS:WM ~ 2.5:1.0:1.5. Gena curved and convex. Anterior margin of clypeus arc-shaped, slightly produced, not truncated. Antenna inserted just above level of lower margin of eyes, with 3-segmented funiculus and 2-segmented clava (Fig. 2C). Scape ~ 4.7× as long as wide, subequal to the combined length of pedicel and F1. Pedicel ~ 1.8× as long as wide, shorter than F1 (8:11). Flagellomeres decreasing in length from F1 to C2. Funiculars separated by short petioles, F1 ~ 2× as long as wide, distinctly longer than F2 (9:11). Clava longer than F1 (13:11), C1 ~ 1.2× as long as wide, C2 narrower than C1 (3:4), with terminal spine nearly 1/2 length of C2.

Mesosoma (Fig. 2D, E), 1.5× as long as wide. Pronotum, mesoscutum, mesoscutellum, and metascutellum with coarse polygonal reticulation, only lateral panels of metanotum and propodeum smooth, without any trace of reticulation. Pronotum short, with weak transverse pronotal carina. Median area of the mesoscutum with two pairs of setae, and posterior margin slightly emarginate. Notauli incomplete and indicated posteriorly by a depression. Mesoscutellum 1.15× as long as wide, oval-shaped, with one pair of setae. Metascutellum very short. Propodeum long, ~ 0.42× as long as mesoscutellum, with single median carina which split and diverge anteriorly, without plica. Fore wing broad, ~ 2× as long as wide, lower surface of costal cell with a row of short setae close to SMV and extending from base to 2/3 length of the cell (Fig. 2J). Basal cell with four setae. Speculum small, and open towards base of wing. STV and PMV short, ratio of length of SMV:MV:PMV:STV ~ 5.4:12.8:1.3:1.0. Hind wing 3.4× as long as wide, apex rounded (Fig. 2K). Legs with metatibial spur slightly curved, longer than the width of apex of tibia (7:5), but not reaching apex of basal tarsomere (Fig. 2F–H).

Metasoma (Fig. 2I), petiole long, at least 1.5× as long as wide. Gaster ovate, 1.5× as long as wide, and shorter than mesosoma (17:20). First gastral tergite occupying 1/3 length of gaster, with posterior margin strongly curved. Ovipositor occupying nearly the complete length of gaster, and slightly exserted beyond apex of gaster.

Male. Unknown.

Host

Unknown.

Etymology

The specific name refers to the yellow femora (flavus is Latin for yellow).

Distribution

China (Tibet).

Remarks

Entedon flavifemur sp. nov. is close to E. magnificus (Girault & Dodd, 1913) (Girault 1913). Based on the re-description of E. magnificus by Gumovsky et al. (2015), the two species share the following characteristics: body mainly metallic green with golden-yellow or copper reflections in some parts; scape, all femora and tibiae yellow to pale yellow; and propodeum smooth and shiny. The new species differs from E. magnificus in having F1 subconical, distinctly longer than F2 (vs. F1 subcircular, only slightly longer than F2 in E. magnificus); fore wing with an oval-shaped infuscate spot below MV (vs. hyaline in E. magnificus); speculum small (vs. distinctly larger in E. magnificus); petiole longer than wide (vs. wider than long in E. magnificus); and propodeum without longitudinal channel on both sides of median carina (vs. with longitudinal channel in E. magnificus).

Entedon albifemur Kamijo, 1988

Figs 3, 4A–K

Entedon albifemur Kamijo, 1988: 334, ♀♂, holotype ♀, Japan, EIHU, not examined.

Material examined

5♀: 3♀ [NEFU; 2 on cards, 1 on slide], China, Liaoning Province, Fushun City, Dahuofang Forestry Station, 18.VI.2012, leg. Xiang-Xiang Jin, Hui Geng and Jiang Liu, by sweep netting; 2♀ [NEFU; 1 on card, 1 on slide], China, Liaoning Province, Huludao City, Jianchang County, Bailangshan National Nature Reserve, 26.VII.2013, leg. Guo-Hao Zu, Ye Chen and Chao Zhang, by sweep netting.

Diagnosis

Female. Antenna mainly dark brown, with bluish green or purple reflections, only base of scape white. All femora and tibiae white, protibia with one longitudinal brown to dark brown stripe dorsally, coxae metallic bluish green (Figs 3, 4F–H). Head strongly reticulate, with smooth transverse area above clypeus and well-developed frontal sulcus (Fig. 4A, B). Antennal scape slender, 5.2× as long as wide; pedicel ~ 2.5× as long as broad; F1 2.3–2.7× as long as wide, 1.0–1.2× as long as pedicel (Fig. 4C). Median area of propodeum with dense reticulation, but callus smooth (Fig. 4D, E). Fore wing hyaline; speculum closed; costal cell bare, with anterior margin slightly curved (Fig. 4J). Petiole quadrate or slightly wider than long. Gaster distinctly shorter than mesosoma.

Figure 3. 

Entedon albifemur Kamijo, female, habitus in lateral view. Scale bar: 200 μm.

Figure 4. 

Entedon albifemur Kamijo, female, on slide A, B head, frontal view C antenna D, E mesosoma F–H fore, mid and hind leg, respectively I metasoma J fore wing K hind wing. Scale bars: 100 μm.

Male. Not collected from China. According to Kamijo (1988), differs distinctly from female as follows: scape swollen in median part, 2.5× as long as wide; pedicel 2× as long as wide; funicular segments separated by distinct petioles.

Host

Unknown.

Distribution

China (Liaoning Province) (new record), Japan (Kamijo 1988), Far East Russia (Gumovsky 1998).

Remarks

The two specimens we collected from Bailangshan National Nature Reserve have the F1 twice as long as wide, shorter than those of the type specimens, and barely longer than the F2; other characteristics are the same as in the type.

Entedon crassiscapus Erdös, 1944

Figs 5, 6A–I, 7A–I

Entedon (Trochentedon) crassiscapus Erdös, 1944: 61, ♀, holotype ♀, Romania, HNHM, not examined.

Entedon (Dolichentedon) flavicrus Erdös, 1944: 38, ♀, lectotype ♀, Hungary, HNHM, not examined. [Synonymized by Bouček and Askew 1968: 80]

Material examined

17♀ 3♂: 4♀, 1♂ [NEFU; 1♀ on card, 3♀, 1♂ on slides], China, Liaoning Province, Anshan City, Mountain Qian Shan, 25.VI.2015, leg. Hui Geng, Si-Zhu Liu, Zhi-Guang Wu and Yan Gao, by sweep netting; 1♀ [NEFU; on card], China, Liaoning Province, Anshan City, Mountain Qian Shan, 23.VI.2015, leg. Hui Geng, Si-Zhu Liu, Zhi-Guang Wu and Yan Gao, by sweep netting; 1♀, 1♂ [NEFU; on cards], China, Liaoning Province, Anshan City, Mountain Qian Shan, 22.VI.2015, leg. Hui Geng, Si-Zhu Liu, Zhi-Guang Wu and Yan Gao, by sweep netting; 1♀, 1♂ [NEFU; on cards], China, Liaoning Province, Anshan City, Mountain Qian Shan, 16.IX.2015, leg. Hui Geng, Ye Chen and Xin-Yu Zhang, by sweep netting; 3♀ [NEFU; on cards], China, Liaoning Province, Fushun City, Dahuofang Forestry Station, 18.VI.2012, leg. Xiang-Xiang Jin, Hui Geng and Jiang Liu, by sweep netting; 2♀ [NEFU; on cards], China, Liaoning Province, Fushun City, Dahuofang Forestry Station, 19.VI.2012, leg. Xiang-Xiang Jin, Hui Geng and Jiang Liu, by sweep netting; 1♀ [NEFU; on card], China, Liaoning Province, Fushun City, Qingyuan County, Shimengou, 10.VI.2012, leg. Xiang-Xiang Jin, Hui Geng and Jiang Liu, by sweep netting; 2♀ [NEFU; on cards], China, Liaoning Province, Huludao City, Jianchang County, Bailangshan National Nature Reserve, 4.VII.2012, leg. Si-Zhu Liu and Jiang Liu, by sweep netting; 1♀ [NEFU; on card], China, Heilongjiang Province, Shangzhi City, Maoershan, leg. Ye Chen and Chao Zhang, by sweep netting; 1♀ [NEFU; on card], CHINA, Inner Mongolia, Yakeshi City, Fenghuang Villa, leg. Yue Qin and Yuan-Yuan Jin, by yellow-pan trapping.

Diagnosis

Female. Antennal scape dark brown to black, with bluish green reflections. All femora dark brown to black with metallic bluish green reflections in proximal 1/2 to 2/3 of its length, the remainder is white; all trochanters and tibiae white, only protibiae with a dark brown longitudinal stripe (Figs 5, 6G–I). Head strongly reticulate; frontal sulcus present and nearly complete; gena straight (Fig. 6A). Antenna with F1 almost as long as pedicel, 1.7× as long as broad, slightly longer than F2; the latter 1.5× as long as broad; F3 quadrate or slightly transverse (Fig. 6B). Fore wing hyaline, costal cell bare, speculum closed (Fig. 6D). Scutellum only slightly longer than broad. Propodeum densely reticulated (Fig. 6C). Petiole slightly wider than long. Gaster slightly shorter than mesosoma.

Figure 5. 

Entedon crassiscapus Erdös, female, habitus in lateral view. Scale bar: 200 μm.

Figure 6. 

Entedon crassiscapus Erdös, female, on slide A head, frontal view B antenna C mesosoma D fore wing E hind wing F metasoma G–I fore, mid and hind leg, respectively. Scale bars: 100 μm.

Male. Clearly differentiated from female as follows: scape swollen in median part, 2.7× as long as wide (Fig. 7B); F3 distinctly longer than wide; propodeum longer than in female.

Figure 7. 

Entedon crassiscapus Erdös, male, on slide A head, frontal view B antenna C mesosoma D fore wing E hind wing F metasoma G–I fore, mid and hind leg, respectively. Scale bars: 100 μm

Host

Unknown from China. According to Bouček and Askew (1968), Entedon crassiscapus primarily parasitize Mordellistena parvula and M. weisei (Coleoptera, Mordellidae).

Distribution

China (Heilongjiang, Liaoning, and Inner Mongolia) (new record), Hungary (Erdös 1944), Germany, Romania, Italy (Bouček and Askew 1968), Azerbaijan, Croatia, Montenegro, Spain (Bouček 1977), Czech Republic, Slovakia (Kalina 1989), Sweden (Hansson 1991), Ukraine, Far East Russia, Japan, Korea (Gumovsky 1998), Bulgaria (Gumovsky and Boyadzhiev 2003).

Entedon nomizonis Kamijo, 1988

Fig. 8A–I

Entedon nomizonis Kamijo, 1988: 331, ♀♂, holotype ♀, Japan, EIHU, not examined.

Material examined

1♀ [NEFU; on slide], China, Liaoning Province, Huludao City, Jianchang County, Bailangshan National Nature Reserve, 4.VII.2012, leg. Si-Zhu Liu and Jiang Liu, by sweep netting.

Diagnosis

Female. Scape dark metallic blue. All coxae and femora metallic bluish green, only apex of all femora pale yellow or white; trochanters brown to black; tibiae mainly pale yellow to white, protibiae dorsally and ventrally dark brown, mesotibiae and metatibiae with single dark brown band basally. Head strongly reticulate, only clypeus smooth; frontal sulcus absent; gena almost straight; clypeus convex, with anterior margin produced and distinctly curved (Fig. 8A). Scape slender, 5.5× as long as wide; pedicel slightly > 2× as long as wide; F1 3.0–3.8× as long as wide (including measurements from the original description, the same below), 1.5–2.0× as long as pedicel, distinctly longer than F2; clava nearly as long as F1 (Fig. 8B). Propodeum smooth and shiny (Fig. 8C). Fore wing hyaline, costal cell bare, with anterior margin distinctly curved; speculum completely open below (Fig. 8D). Metatibial spur long and slightly curved, nearly reaching apex of basal tarsomere (Fig. 8I). Petiole longer than wide. Gaster shorter and wider than mesosoma.

Figure 8. 

Entedon nomizonis Kamijo, female, on slide A head, frontal view B antenna C mesosoma D fore wing E hind wing F metasoma G–I fore, mid and hind leg, respectively. Scale bars: 100 μm.

Male. Not collected from China. According to Kamijo (1988), differs from female as follows: scape swollen in median part, 2.4–2.7× as long as wide; all five flagellar segments separated by distinct petioles, filiform, hardly stouter than pedicel; F1 nearly 6× as long as wide, narrowed medially; petiole 1.7× as long as wide, and distinctly longer than propodeum.

Host

Unknown from China. According to Kamijo (1988), Entedon nomizonis primarily parasitizes Rhynchaenus japonicus, R. sanguinipes, and R. takabayashii (Coleoptera, Curculionidae).

Distribution

China (Liaoning Province) (new record) and Japan (Kamijo 1988).

Acknowledgements

We are grateful to Dr Xiang-Xiang Jin, Guo-Hao Zu, Ye Chen, Hui Geng, Si-Zhu Liu, Mr Zhaxi, Chao Zhang, Jiang Liu, Zhi-Guang Wu, Miss Yan Gao, Xin-Yu Zhang, Yuan-Yuan Jin and Yue Qin for specimen collection. We are also grateful to Prof. Christer Hansson, Dr Alex Gumovsky and an anonymous reviewer for providing valuable comments and suggestions to improve the manuscript.

Additional information

Conflict of interest

The authors have declared that no competing interests exist.

Ethical statement

No ethical statement was reported.

Funding

No funding was reported.

Author contributions

Funding acquisition: CDL. Writing - original draft: MRL. Writing - review and editing: CDL.

Author ORCIDs

Ming-Rui Li https://orcid.org/0000-0002-9143-1548

Data availability

All of the data that support the findings of this study are available in the main text.

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