Research Article |
Corresponding author: Zai-fu Xu ( xuzaifu@scau.edu.cn ) Academic editor: Norman Johnson
© 2016 Jun Feng, David Notton, Zai-fu Xu.
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:
Feng J, Notton D, Xu X-f (2016) A new species of Calogalesus Kieffer from China (Hymenoptera, Diapriidae) with a key to World species. ZooKeys 626: 57-65. https://doi.org/10.3897/zookeys.626.9771
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A new species of Calogalesus Kieffer, 1912, C. sinicus sp. n., is described and illustrated, collected from a Chinese prickly ash (Zanthoxylum bungeanum Maxim.) orchard in Yunnan province of China. This is the third described species of the genus in the World. The new species can be distinguished from the other two described Calogalesus species by the head profile, proportions of the antennal segments, tridentate mandible, and mandible length. A key to World species of the genus is provided.
Hymenoptera , Diapriinae , Calogalesus , new species, Oriental region, China
Calogalesus Kieffer, 1912 is a small genus in Diapriinae (Hymenoptera: Diapriidae), comprising two previously described species: Calogalesus parvulus Kieffer, 1912 from the Seychelles and Calogalesus malabaricus Rajmohana & Narendran, 2006 from India (
In recent years, during the survey of the Chinese fauna of Diapriidae funded by the National Natural Science Foundation of China, fifty-four specimens (of both sexes) belonging to Calogalesus were collected in Yunnan; this material is described here as a new species.
All specimens were collected using yellow pan traps placed in a Chinese prickly ash (Zanthoxylum bungeanum Maxim.) orchard in Zhaotong, Yunnan from 10.VIII.2012 to 26.X.2012.
Specimens were examined and described under a Zeiss Stemi 2000-CS stereomicroscope. All photos were taken with a digital camera (Cool SNAP) attached to the Zeiss Stemi 2000-CS stereomicroscope and processed by using Image-Pro Plus software.
Morphological terminology mainly follows
Measurements reported are relative, and refer to ratios, except for body length (head to abdominal tip, excluding antennae and ovipositor, when the body is fully extended) and fore wing length.
The holotype, 13 female and 34 male paratypes of the new species are deposited in the
Calogalesus
Kieffer, 1912b: 6, 43. Type species: Calogalesus parvulus Kieffer, 1912, by monotypy;
Calicuta
Rajmohana & Narendran, 2000a: 22–23, unavailable name;
Body mainly blackish-brown, brown or orange, smooth and shiny. Head with antennal shelf strongly projecting, laterally sharply angled and medially divided; frons with a curved carina on each side extending backwards, forming a ledge above upper eye orbit. Mandible bidentate or tridentate, together beak-like, projecting backwards. Antenna 12-segmented in female, 14-segmented in male; with A1 the longest segment. Female antenna without a clearly defined clava, but flagellar segments more or less thickened apically. Notauli distinct, not reaching transscutal articulation. Scutellum with two large anterior foveae. Fore wing with well-developed marginal cilia and two elongate hairless zones. Petiole strongly curved in lateral view.
This genus shows a nasiform head (elongated with frontal projections) and opisthognathous (backwards directed) beak-like mandibles, which may be associated with digging for hosts and/or bursting from host remains (
The genus is known from the following biogeographic regions: Afrotropical (
The genus Calicuta was described by
Key to World species of Calogalesus
1 | Females: 12 antennal segments; apex of metasoma pointed; ovipositor sheaths visible; apical flagellar segments more or less thickened | 2 |
– | Males: 14 antennal segments; apex of metasoma blunt, often sunk inside T2 and not visible; no ovipositor sheaths; apical flagellar segments usually elongate, at least not thicker than basal flagellar segments | 4 |
2 | Antenna longer than head and mesosoma (1.1:1.0), A4–A7 1.4 times as long as wide, A8–A10 1.17 times as long as wide; head profile less flattened (head length to height=1.0:1.0), subtriangular in lateral view; mandible tridentate, 0.5 times as long as eye height; POL:OOL=0.4:1.0 | C. sinicus sp. n. |
– | Antenna shorter than head and mesosoma (0.85–0.9:1.0), A4–A7 as long as wide, A8–A10 as long as wide or shorter than wide; head profile more flattened (head length to height=1.2–1.3:1.0), subrectangular in lateral view; mandible bidentate, 0.6–0.8 times as long as eye height; POL:OOL=1.2–1.3:1.0 | 3 |
3 | A2 as long as A3; A8–A10 as long as wide; mandible 0.8 times as long as eye height | C. malabaricus Rajmohana & Narendran |
– | A2 1.5 times as long as A3; A8–A10 distinctly shorter than wide; mandible 0.6 times as long as eye height (Fig. |
C. parvulus Kieffer |
4 | Head profile more flattened (head length to height=1.3:1.0), subrectangular in lateral view; mandible nearly as long as eye height (0.8:1.0); A4 0.9 times as long as A3 | C. malabaricus Rajmohana & Narendran |
– | Head profile less flattened (head length to height=1.0:1.0), subtriangular in lateral view; mandible distinctly shorter than eye height (1.0:2.0); A4 0.8 times as long as A3 | C. sinicus sp. n. |
Holotype, ♀: CHINA: Yunnan, Zhaotong, Huanghua town (N27°59', E103°33'), 10.VIII.2012, Shi-wen Yang leg. Paratypes: 16 ♀♀, Yunnan, Zhaotong, Huanghua town (N27°59', E103°33'), 10.VIII–26.X.2012, Shi-wen Yang leg.; 37 ♂♂: Yunnan, Zhaotong, Huanghua town (N27°59', E103°33'), 10.VIII–26.X.2012, Shi-wen Yang leg.
Female (Figs
Colour. Head blackish-brown, mandibles brown. Antennae yellowish-brown. Mesosoma brown. Legs and tegulae yellowish-brown. Wings hyaline, with veins yellowish-brown. Metasoma brown, with apex yellowish-brown.
Head. Head subcircular in dorsal view, subtriangular in lateral view; smooth and shiny, with sparse hairs. Mandible tridentate, strongly projecting, beak-like. Labrum subtriangular. Clypeus highly convex. Eyes oval, slightly bulging laterally, with sparse hairs. Malar sulcus distinct. Frons with two sharp points and longitudinal ledges above upper eye orbit. Antennal shelf strongly projecting. Antenna 12-segmented (Fig.
Mesosoma. Mesosoma as wide as head in dorsal view. Cervix distinct. Pronotum smooth and shiny. Pronotal shoulders almost rounded. Epomium indistinct. Mesoscutum smooth and shiny, with sparse hairs. Notauli deep and posteriorly convergent, incomplete, reaching 0.90 length of mesoscutum, not reaching transscutal articulation. Humeral sulcus distinct. Mesoscutellum subtriangular, smooth and shiny, with two large foveae on anterior half and a row of small pits on the posterior margin. Mesopleuron smooth and shiny, with a groove beneath tegula. Sternaulus indistinct. Metanotum and metapleura reticulate rugose. Propodeum reticulate rugose. Dorsal surface of propodeum with one median longitudinal keel. Plica distinctly projecting posteriorly. Posterior surface of propodeum carinate and emarginated, descending abruptly and steeply with two postero-lateral teeth in lateral view. Wings (Fig.
Metasoma. Petiole sparsely hairy, shiny, rugose with longitudinal striae, distinctly curved in lateral view; 2.6 times as long as wide in dorsal view; 2.3 times as long as high in lateral view. Gaster moderately compressed laterally. T2 enlarged, 2.6 times as long as wide in dorsal view, and covering 0.65 length of gaster in dorsal view. Anterior margin of T2 straight, without furrow or emargination. Metasomal tip conical.
Variation. Body length 1.1–1.4 mm (n=17). Fore wing length 1.0–1.3 mm (n=17).
Male (Figs
Host unknown. This species was collected by placing 500 yellow pan traps in a Chinese prickly ash (Zanthoxylum bungeanum Maxim.) orchard (Figs
Known from a single location in China (Yunnan).
This new species can be separated from the two described species, C. parvulus Kieffer, 1912 (Fig.
The new species is named after the country of the type locality, China.
We are very grateful to Shi-wen Yang for collecting the specimens, Wei Dong for providing the habitat photographs of Calogalesus sinicus sp. n., and Zi Hou for providing the holotype photograph of C. parvulus Kieffer. We are also very grateful to subject editor Dr Norman Johnson and anonymous reviewers for their comments to improve the manuscript. This study was supported by the National Natural Science Foundation of China (31272351, U0936601) and The Natural History Museum, London (