Oxytorus carinatus Riedel, 2021

Riedel, Matthias, Vu Van, Lien & Schmidt, Stefan, 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, pp. 69867-69867 : 69867

Oxytorus carinatus Riedel sp. n.

Materials

Type status: Holotype. Occurrence : recordedBy: Stefan Schmidt ; individualCount: 1; sex: female; lifeStage: adult; Taxon : scientificName: Oxytorus carinatus; phylum: Arthropoda ; class: Insecta ; order: Hymenoptera ; family: Ichneumonidae ; genus: Oxytorus ; specificEpithet: carinatus; taxonRank: species; scientificNameAuthorship: Riedel ; Location : higherGeography: South-east Asia ; country: Vietnam; countryCode: VN; stateProvince: Th ừa Thiên-Hu ế; locality: Bach Ma National Park ; verbatimElevation: 1236; decimalLatitude: 16.19368; decimalLongitude: 107.85596; geodeticDatum: WGS84; Identification : identifiedBy: Matthias Riedel; Event: eventID: ZSM-HYM-S271e; samplingProtocol: Yellow Pan Trap; eventDate: 09-06-2018; Record Level: type: PhysicalObject; language: en; institutionCode: VNMN; collectionCode: Entomology; basisOfRecord: PreservedSpecimen Type status: Paratype. Occurrence : recordedBy: Stefan Schmidt ; individualCount: 1; sex: female; lifeStage: adult; Taxon : scientificName: Oxytorus carinatus; phylum: Arthropoda ; class: Insecta ; order: Hymenoptera ; family: Ichneumonidae ; genus: Oxytorus ; specificEpithet: carinatus; taxonRank: species; scientificNameAuthorship: Riedel ; Location : higherGeography: South-east Asia ; country: Vietnam; countryCode: VN; stateProvince: Th ừa Thiên-Hu ế; locality: Bach Ma National Park , along trail to summit ; verbatimElevation: 1294; decimalLatitude: 16.19488; decimalLongitude: 107.85365; geodeticDatum: WGS84; Identification : identifiedBy: Matthias Riedel; Event: eventID: ZSM-HYM-S2772; samplingProtocol: Yellow Pan Trap; eventDate: 10-06-2018; Record Level: type: PhysicalObject; language: en; institutionCode: ZSM; collectionCode: Entomology; basisOfRecord: PreservedSpecimen

Description

Female holotype (Fig. 1)

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. 1 c). Distance of lateral ocellus to eye 1.0x ocellar diameter. Frons and vertex granulate, dull. Face finely punctate and granulate, dull. Clypeus smooth, with some fine setiferous punctures and basal transversal ridge. Malar space 0.5x as long as width of mandibular base. Mandible slender; upper tooth longer than lower one. Maxillary palp very long, 2nd palpomere about as long as 3rd hind tarsomere. Genal carina reaching hypostomal carina away from mandibular base; both carinae low.

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. 1 f). Metapleuron finely punctate; juxtacoxal carina absent. Scutellum moderately elevated, longer than wide, densely punctate, with complete lateral carina. Propodeum completely carinate, largely smooth and shining. Area basalis almost triangular, slightly longer than wide. Area superomedia with central transverse carina; frontal part almost triangular, caudal part rectangular and wider than long; anterior transverse carina (costula) reaching in its middle (Fig. 1 b). Apical transverse carina of propodeum slightly lamelliform elevated at posterolateral edge of area dentipara. Hind femur 4.0-4.3x longer than wide; hind tibia 5.1-5.3x as long as wide, apical spurs slightly curved apically. Hind tarsus 1.55x as long as hind tibia. Claws simple, strongly curved, ca. 90° apically.

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. 1 e). Thyridium oval, situated at basal margin of 2nd tergite. 2nd and 3rd tergites with fine dense setiferous punctures, shining. 2nd and 3rd sternites with median folds. Ovipositor sheath rather wide, pointed apically.

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.

Diagnosis

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 ( Kasparyan et al. 2014), but differs by its colour and the unique characters mentioned above.

Male

Unknown

Type depository

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.