Research Article |
Corresponding author: Cheng-De Li ( lichengde0608@sina.com ) Academic editor: Norman Johnson
© 2021 Jun-Jie Fan, 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:
Fan J-J, Li C-D (2021) Three new species of Stenomesius Westwood (Hymenoptera, Eulophidae) from China, with a key to Chinese species. ZooKeys 1062: 1-10. https://doi.org/10.3897/zookeys.1062.67487
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Three new species of Stenomesius Westwood, S. guanshanensis sp. nov., S. hani sp. nov., and S. harbinensis sp. nov., are described from China. A key to all species of the genus Stenomesius in China is provided.
Chalcidoidea, Eulophinae, parasitoid, taxonomy
The genus Stenomesius (Hymenoptera, Eulophidae) was erected by
This study describes three new species of the genus Stenomesius and provides a key to all species of the genus distributed in China.
All specimens were collected by sweeping or yellow pan trapping, and they were dissected and mounted in Canada balsam on slides following the method of
Terminology follows the
Stenomesius Westwood, 1833: 343. Type species: Stenomesius pulchellus Westwood, by subsequent designation of Westwood 1839: 73.
Euryscotolinx
Girault, 1913: 266. Type species: Euryscotolinx guttativertex Girault, by original designation and monotypy. [Synonymised with Stenomesius Westwood by
Stenelachistus
Masi, 1917: 201. Type species: Stenelachistus impressus Masi, by subsequent designation of
Nioro
Risbec, 1951: 25. Type species: Nioro elegantula Risbec, by monotypy. [Synonymised with Stenomesius Westwood by
The genus can be easily distinguished from other eulophine genera by the following combination of characters: female funicle 4-segmented and club 2–3-segmented; mandible developed; pronotum without transverse carina; scutellum with sublateral grooves; propodeum medially with a strong X- or H-shaped carinae; hind tibial spurs normal; petiole shorter than hind coxa, gaster usually elongate.
The genus Stenomesius is close to the genus Stenopetius Bouček and Euplectromorpha Girault in having similar type of propodeum with H- or X-shaped carinae, but it differs from Stenopetius Bouček in having: 1) female funicle 4-segmented (5-segmented in Stenopetius Bouček); 2) pronotum without transverse carina (with distinct transverse carina in Stenopetius Bouček); 3) petiole shorter than hind coxa (longer than hind coxa in Stenopetius Bouček). It differs from Euplectromorpha in having hind tibia normal, at least with one spur distinctly longer than first hind tarsal segment in Euplectromorpha.
1 | Scutellum with sublateral grooves not meeting each other posteriorly | S. guanshanensis , sp. nov. |
– | Scutellum with sublateral grooves meeting each other posteriorly | 2 |
2 | Clava 3-segmented; axillae almost meeting medially | S. japonicus (Ashmead) |
– | Clava 2-segmented; axillae separated from each other | 3 |
3 | Midlobe of mesoscutum with 2 pairs of setae; axillae smooth | S. maculatus Liao |
– | Midlobe of mesoscutum with 3 pairs of setae; axillae finely reticulate | 4 |
4 | Mesoscutum with anterior half black and posterior half yellow, forewing with a line of setae in full length of costal cell on upper surface | S. hani, sp. nov. |
– | Mesoscutum dark brown, forewing with several setae on upper surface of costal cell distally | S. harbinensis, sp. nov. |
Holotype , ♀ [NEFU; on card], China, Jiangxi Province, Yichun City, Guanshan National Nature Reserve, 2.VIII.2018, Xiang-Xiang Jin and Wang-Ming Li, by sweeping.
Paratype : 1♀ [on slide], same data as holotype.
Lower face yellow; interantennal area yellowish; upper face and vertex black with area around eye margins yellow; antenna inserted at high above the lower eye margins and on the middle of between anterior ocellus and lower margin of clypeus. Pronotum with dorsal side black and lateral sides yellowish; mesoscutum, axillae and scutellum yellow or yellowish except about posterior 1/6 of scutellum black; midlobe of mesoscutum with 4 pairs of long setae; scutellum light alutaceous; dorsellum and lateral panels black; propodeum yellowish with carina brown.
Female. Length 2.0–2.2 mm. Lower face yellow; interantennal area yellowish; upper face and vertex black with area around eye margins yellow; scape yellow except apical half of dorsal surface pale brown, pedicel and flagellum dark brown; mandibles yellow with teeth brown; gena yellow; occiput black. Pronotum with dorsal side black and lateral sides yellowish; mesoscutum, axillae, and scutellum yellow or yellowish, except about posterior 1/6 of scutellum black; dorsellum and lateral panels black; propodeum yellowish, with carina brown; wings hyaline, with veins pale brownish yellow; legs pale yellow, with claws brown; gaster mainly yellowish with apex brown, anterior 1/3 of lateral margins, two spots on median part, and spots on lateral sides of T4–7 dark brown; ovipositor black.
Head
(Fig.
Mesosoma
(Fig.
Metasoma
(Fig.
Male. Unknown.
Unknown.
China (Jiangxi).
The specific name is derived from the name of the type locality.
Holotype , ♀ [NEFU; on card], China, Heilongjiang Province, Mudanjiang City, Heixiazigou, 26–28.VIII.2015, Hui Geng, Yan Gao and Zhi-Guang Wu, by yellow pan trapping.
Paratype : 1♀ [on slide], China, Heilongjiang Province, Shangzhi City, Maoershan, 18.V.2018, Guang-Xin Wang, Ming-Rui Li and Ye Sai, by sweeping.
Lower face yellow; upper face dark brown except lower most about 1/6 yellow; vertex dark brown with 2 triangular, yellow spots; antenna inserted at middle of the face; scape yellow, with about apical half of dorsal surface brown; mesoscutum with anterior half black and posterior half yellow; midlobe of mesoscutum with 3 pairs of long setae; scutellar-axillar complex dark brown, metanotum black; propodeum yellowish brown.
Female. Length 1.7–1.9 mm. Lower face yellow; upper face dark brown except lower 1/6 yellow; vertex dark brown with a triangular, yellow spots at each side; scape yellow with about apical half of dorsal surface brown, pedicel and flagellum black; mandibles yellow, with teeth brown; gena yellow; occiput mostly dark brown. Pronotum yellow, with a dark brown spot in the middle; mesoscutum with anterior half black and posterior half yellow; axillae and scutellum dark brown; dorsellum and lateral panels black; propodeum brownish; Petiole dark brown; gaster mainly yellowish-brown, with anterior half of lateral margins dark brown, T3–5 each with a transverse dark brown stripe; ovipositor black. wings hyaline with veins pale brownish yellow; legs yellow, with claws brown.
Head
(Fig.
Mesosoma
(Fig.
Metasoma
(Fig.
Male. Unknown.
Unknown.
China (Heilongjiang).
The species is named for Prof. Hui-Lin Han of the Northeast Forestry University, Harbin, China.
Stenomesius hani is similar to S. anati Khan & Singh in sharing: antenna inserted in middle of face; face with dark brown infuscation above antennal torulus; anterior half of mesoscutum, scutellum, and axillae with dark brown infuscation. Stenomesius hani can be separated from the latter by the following combination of characters: scutellum with 2 pairs of setae (3 pairs in S. anati); distal 1/3 costal cell with setae (whole costal cell with setae in S. anati); gaster 1.1× as long as mesosoma (shorter than mesosoma in S. anati).
Holotype , ♀ [NEFU; on card], China, Heilongjiang Province, Harbin City, Northeast Forestry University, 20–21.IX.2018, Ming-Rui Li, Wen-Jian Li, Jun-Jie Fan, Yu-Ting Jiang, Guang-Xin Wang and Jun Wu, by yellow pan trapping.
Paratypes : 1♀ [on slides], same data as holotype; 1♀ [on card], China, Heilongjiang Province, Shangzhi City, Maoershan, 18–19.V.2018, Ming-Rui Li, Guang-Xin Wang and Ye Sai, by yellow pan trapping.
Vertex black; occiput mostly black with two small, yellow spots near eyes margins; lower face yellow; upper face black; antenna inserted in above the lower eye margins; scape mostly yellow with about apical half of dorsal surface pale brown; pronotum with dorsal surface black and lateral sides yellowish; mesoscutum dark brown; midlobe of mesoscutum with 3 pairs of long setae; scutellar-axillar complex, metanotum, and propodeum black.
Female. Length 1.8–1.5 mm. Head black with area below antennal toruli and two small spots on vertex yellow; scape mostly yellow with about apical half of dorsal surface pale brown, pedicel, and flagellum dark brown; mandibles yellow, with teeth brown; gena yellow; occiput black. Pronotum with dorsal side black and lateral sides yellowish; mesoscutum dark brown; scutellar-axillar complex, metanotum, and propodeum black; wings hyaline, with veins pale brownish yellow; legs yellow with claws brown; gaster mainly black, with apex brown, anterior half with a median, large, yellowish-brown spot; ovipositor black.
Head
(Fig.
Mesosoma
(Fig.
Metasoma
(Fig.
Male. Unknown.
Unknown.
China (Heilongjiang).
The specific name is derived from the name of the type locality.
We are grateful to Dr Hui Geng, Dr Xiang-Xiang Jin, Mr Guang-Xin Wang, Dr Wen-Jian Li, Mr Zhi-Guang Wu, Mr Ming-Rui Li, Mr Ye Sai, Mr Jun Wu, Mr Wang-Ming Li, Miss Yan Gao, and Miss Yu-Ting Jiang for specimen collection. We are also grateful to Dr Michael Gates and Dr Vilayanoor Ramamurthy for providing references.