Biodiversity Data Journal :
Taxonomic Paper
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Corresponding author: Matthias Riedel (mamaflo.riedel@t-online.de), Stefan Schmidt (schmidt.s@snsb.de)
Academic editor: Francisco Javier Peris Felipo
Received: 08 Jun 2021 | Accepted: 02 Jul 2021 | Published: 13 Aug 2021
© 2021 Matthias Riedel, Lien Vu Van, Stefan Schmidt
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:
Riedel M, Vu Van L, Schmidt S (2021) First record of the subfamily Oxytorinae (Insecta, Hymenoptera, Ichneumonidae) from the Oriental Region, with descriptions of two new species from Vietnam. Biodiversity Data Journal 9: e69867. https://doi.org/10.3897/BDJ.9.e69867
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The Oxytorinae is a small subfamily of the family Ichneumonidae (Insecta, Hymenoptera) with the single genus Oxytorus Förster and 23 described species. Species were previously known to occur in the Palaearctic, Nearctic and Neotropical Regions.
The ichneumonid subfamily Oxytorinae is recorded for the first time from the Oriental Region. Two species, one from northern and one from central Vietnam, are described as new: Oxytorus carinatus Riedel, sp. n. and O. rufopropodealis Riedel, sp. n.
South-east Asia, biodiversity, new species, capacity building, Cuc Phuong National Park, Bach Ma National Park, biogeography
The Oxytorinae is a small subfamily of Ichneumonidae (Hymenoptera) that includes only the genus Oxytorus Förster, with 23 described species found in the Palaearctic, Nearctic and Neotropic Regions (
The present study resulted from capacity building training courses that were part of the ongoing German-Vietnamese VIETBIO project. The project aims at establishing the foundation for future biodiversity joint projects through capacity building and biodiversity research in Vietnam. Field courses took place in two national parks: Bach Ma National Park in central Vietnam (June 2018) and Cuc Phuong National Park in northern Vietnam (April-May 2019). The Bach Ma National Park demarcates the border between north and south Vietnam ranging from lowland to high mountains, with Bach Ma being considered as a biodiversity hotspot (
Morphological terms and measurements follow
Female holotype (Fig.
Morphology. Body length 8.0 mm (paratype 7.5 mm). Flagellum with 30 flagellomeres, long and filiform; 1st flagellomere 4.3x as long as wide; 3rd flagellomere 3.6x as long as wide; pre-apical flagellomere 1.25x as long as wide. Temple short, strongly and almost linearly narrowed behind eye, dorsally ca. 0.35x as long as eye (Fig.
Mesosoma covered with grey setae. Mesoscutum finely and densely punctate, shining. Notaulus impressed in frontal 0.5 of mesoscutum. Mesopleuron smooth, with fine, dense setiferous punctures ventrally and frontally, speculum smooth and shining (Fig.
Areolet open distally (vein 3rs-m absent); vein 2m-cu slightly proximal to its middle. Vein 1cu-a slightly postfurcal. Nervellus of hind wing slightly inclivous.
Metasoma rather slender, mainly smooth and shining. 1st tergite 3.0x longer than wide; postpetiole almost smooth, with fine dorso-lateral carina. 2nd tergite 1.05x as wide as long, with distinct dorso-lateral longitudinal carina (Fig.
Colour. Black. Mandible, except teeth, apical 2/3 of clypeus, scape, pedicel and two basal flagellomeres reddish-yellow; following flagellomeres black; flagellomeres 13–19 with ivory stripes or rings. Palps, fore and mid-coxae, all trochanters and hind tarsus, except black base of hind metatarsus ivory. Tegula, spot on speculum, entire metapleuron and propodeum red. Metasoma black; 2nd and 3rd tergites with diffuse reddish spots apically; 2nd and 3rd sternites yellowish. Fore and mid-femora, tibiae and tarsi reddish-yellow; hind coxa red; hind femur red, narrowly infuscate at apex; hind tibia black, with reddish or yellowish external stripe. Wings hyaline; pterostigma brown.
The species is characterised within the genus Oxytorus by the transverse carina of the area superomedia and the distinct lateral longitudinal carina of the 2nd tergite. Due to the absent vein 3rs-m, the species runs to O. luridator (Gravenhorst, 1820) in the key to Palaearctic species (
Unknown
The holotype is deposited in the Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, Hanoi, Vietnam and the paratype in the Zoologische Staatssammlung München, Munich, Germany.
Female holotype (Fig.
Morphology. Body length 8.2 mm (paratype: 7.3 mm). Flagellum with 31 (paratype: 28) flagellomeres, long and filiform; 1st flagellomere 4.2x as long as wide; 3rd flagellomere 3.9x as long as wide; pre-apical flagellomere 1.1x as long as wide. Temple short, strongly and almost linearly narrowed behind eye, ca. 0.4x as wide as eye (Fig.
Mesosoma covered with grey setae. Mesoscutum finely punctate and granulate, dull. Notaulus not impressed. Mesopleuron smooth, with band of fine longitudinal striation dorsally and rather dense setiferous punctures ventrally, speculum smooth and shining (Fig.
Areolet rhombic, pointed or shortly sessile frontally; vein 2m-cu slightly distal to its middle. Vein 1cu-a interstitial. Nervellus of hind wing slightly inclivous.
Metasoma rather slender, mainly smooth and shining. 1st tergite 2.4x longer than wide; postpetiole with fine longitudinal striae, especially on lateral fields. 2nd tergite 1.25x wider than long, without lateral carina. Thyridium oval, situated at basal margin of 2nd tergite. 2nd and 3rd tergites with some fine setiferous punctures laterally. 2nd and 3rd sternites with median folds. Ovipositor sheath stout and wide.
Colour. Black. Scape, pedicel and two basal flagellomeres yellowish; following flagellomeres black; flagellomeres 10-17 with ivory stripes or rings. Palps, fore and mid-coxae, all trochanters and hind tarsus, except black base of hind metatarsus, ivory. Tegula, scutellum and postscutellum yellowish. Hind margin of mesopleuron, entire metapleuron and propodeum red. Metasoma black; petiolus partly reddish-brown dorsally; post-petiolus, 2nd and 3rd tergites with yellowish bands in apical halfs; 2nd and 3rd sternites yellowish. Fore and mid-femora, tibiae and tarsi pale yellowish; hind coxa reddish-yellow, with brown lateral stripe; hind femur red or chestnut-red; hind tibia blackish, with cream-yellow sub-basal stripe. Wings hyaline; pterostigma ochreous.
The species runs to O. kamikochianus (Momoi, 1965) in the key of
Unknown
The holotype is deposited in the Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, Hanoi, Vietnam and the paratype in the Zoologische Staatssammlung München, Munich, Germany.
This research was supported by the German Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung, Berlin, Germany, project “Innovative approaches to biodiversity discovery and characterization” (VIETBIO), Grant No. 01DP17052). The support by the Directorial Board and staff of the Bach Ma and Cuc Phuong National Parks is greatly appreciated. We also would like to thank all 'VIETBIO' Vietnamese and German colleagues for their support during the field expeditions.