Biodiversity Data Journal :
Taxonomy & Inventories
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Corresponding author: Si-Zhu Liu (liusz@cqupt.edu.cn)
Academic editor: Miles Zhang
Received: 30 Jul 2022 | Accepted: 16 Sep 2022 | Published: 26 Sep 2022
© 2022 Hui Geng, Cheng-De Li, Andrew Polaszek, Si-Zhu Liu
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:
Geng H, Li C-D, Polaszek A, Liu S-Z (2022) Two new species and a new record of the Encarsia longifasciata-group (Hymenoptera, Aphelinidae) from Malaysia and China. Biodiversity Data Journal 10: e91069. https://doi.org/10.3897/BDJ.10.e91069
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The genus Encarsia Förster, 1878, which is the largest genus of the family Aphelinidae, contains 453 valid species worldwide. Most species of Encarsia with known biology are primary endoparasitoids of Aleyrodidae and Diaspididae.
Species of the Encarsia longifasciata-group from Malaysia and China are reviewed. This is the first record of this group from Malaysia. Two new species, E. borneensis Geng & Li sp. n. and E. pauroseta Geng & Li sp. n., are described and illustrated. Encarsia longifasciata is newly recorded from Malaysia (Borneo). An updated key to the longifasciata-group species (females) worldwide is provided.
Chalcidoidea, parasitoid, Southeast Asia, taxonomy
So far, 108 and 11 species are described from China and Malaysia, respectively (
Specimens were collected from Yunnan, China and Borneo, Malaysia using yellow pan traps. Specimens were dissected and mounted dorsally in Canada balsam on slides following the method of
Photographs were taken with a digital CCD camera attached to an Olympus BX51 compound microscope and most measurements were made from slide-mounted specimens using an eye-piece graticule. All the specimens listed below are deposited in the Northeast Forestry University, Harbin, China.
The following abbreviations are used:
Fn flagellar antennomeres.
Tn metasomal tergum.
YPT yellow pan trapping.
NEFU Northeast Forestry University, Harbin, China.
NHMUK Natural History Museum, London, UK.
Female (Fig.
Head (Fig.
Mid-lobe of mesoscutum (Fig.
Petiole smooth (Fig.
Head and body largely dark brown, except scutellum and some pale spots on last three metasomal segments. Antennal F1 and F2 with longitudinal sensilla, F1 1.5× as long as pedicel. Mid-lobe of mesoscutum with three pairs of setae. Third valvulae brown and terminating in an abrupt angle.
The specific name is derived from the collection locality name.
The new species is easy to distinguish from other species of this group by the combination of a dark metasoma, F1 with longitudinal sensilla and distinctly longer than pedicel and three pairs of setae on mid-lobe of mesoscutum.
Female (Fig.
Head (Fig.
Mid-lobe of mesoscutum (Fig.
Ovipositor (Fig.
Body largely yellow, except head, pronotum, mid-lobe of mesoscutum and axilla dark brown; mid-lobe of mesoscutum and scutellum with imbricate sculpture. Fore wing (Fig.
Ancient Greek παῦρος (paûros) small, little, referring to the sparse setation of the fore wing disc.
This species has unusual fore wings, the disc of which is very sparsely setose, with the maximum width as long as the maximum marginal fringe length. The remaining E. longifasciata-group species have the maximum marginal fringe length at most 0.7× as long as maximum disc width. This species appears to be similar to E. dewa Pedata & Polaszek having the mid-lobe with two setae, but can be distinguished from the latter by the following: marginal fringe of fore wing as long as width (vs. 0.65-0.7×), scutellum, tegula and metasoma totally pale yellow (vs. inverted triangular patch on scutellum, tegula and sides of metasoma brown), F2 0.67× as long as F3 and without longitudinal sensilla (vs. F2 subequal to slightly shorter than F3, with one longitudinal sensillum),fore wing with a clear asetose area towards the apex (vs. fore wing with less asetose wing disc towards the apex).
Encarsia longifasciata
Encarsia longifasciata Subba Rao:
Two specimens agree with the descriptions given by
Key to species of Encarsia longifasciata-group (females) – update of the key in Pedata and Polaszek 2003 |
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1 | Mid-lobe of mesoscutum with 3 pairs of setae | 2 |
– | Mid-lobe of mesoscutum with 1-2 pairs of setae | 3 |
2 | Face and axillae dark brown; metasoma largely dark brown. F1 1.5× as long as pedicel and with two longitudinal sensilla | E. borneensis sp. n. |
– | Face and axillae pale; metasoma largely pale, except T1-T4 laterally and T5 and T6 dark brown. F1 slightly shorter than pedicel and without longitudinal sensilla | E. aleuroplati |
3 | Mid-lobe of mesoscutum with 2 pairs of setae; fore wing more densely setose | 4 |
– | Mid-lobe of mesoscutum with 1 pair of setae; fore wing more sparsely setose | 5 |
4 | Head dark brown; F1 distinctly shorter than F2 | 6 |
– | Head largely pale; F1 as long as F2 | E. prinslooi |
5 | Scutellum almost totally pale | 7 |
– | Scutellum largely pale with a dark triangular patch centrally | E. dewa |
6 | Anterior half of mid-lobe brown; basal cell with 4 setae; F1 0.64× as long as pedicel | E. cassida |
– | Mid-lobe entirely brown, except sides and posterior margin light brown; basal cell with 1 seta; F1 subequal to slightly shorter than pedicel | E. arabica |
7 | Fore wing marginal fringe as long as disc width, with a clear asetose area around stigmal vein and a wide asetose strip along margin of disc; F2 1.71× as long as wide; third valvula 0.42× as long as ovipositor | E. pauroseta sp. n. |
– | Fore wing marginal fringe 0.59× as disc width, with an asetose area around stigmal vein and a narrow asetose strip along distal and posterior margin of wing; F2 more than 2× as long as wide; third valvula 0.27-0.32× as long as ovipositor | E. longifasciata |
This project was supported by the Scientific Research Foundation project of Chongqing University of Posts and Telecommunications (No. E012A2021200), the Science and Technology project of the Education Department of Jiangxi Province (Grant No. GJJ211721). Geng Hui would like to acknowledge the help of Mr Rahim Sulaiman, former Deputy Chief Conservator of Forests, Sabah Forestry Department, for facilitating access to the type locality of E. borneensis sp. n.