JHR 97: 491-504 (2024) Ze JOURNAL OF Arevmteredovensconn urn doi: 10.3897/jhr.97.121436 RESEARCH ARTICLE () I Tymenopter a a https://jhr.pensoft.net ‘The International Society of Hymenopterisss RESEARCH A new enigmatic genus of the ichneumonid subfamily Ctenopelmatinae (Hymenoptera, Ichneumonidae) from Thailand Avunjikkattu P. Ranjith', Donald L. J. Quicke', Alexey Reshchikov’, Buntika A. Butcher' | Integrative Insect Ecology Research Unit, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok, Thailand 2. Biodiversity and Environmental Change Lab, School of Biological Sciences, University of Hong Kong, Kadoorie Biological Sciences Building, Pokfulam Road, Hong Kong SAR, China Corresponding author: Buntika A. Butcher (buntika.a@chula.ac.th) Academic editor: Tamara Spasojevic | Received 22 February 2024 | Accepted 17 May 2024 | Published 4 June 2024 https://z00bank. org/1 B48635F-A630-4A27-A22C-4B6BEA2ZE1D5B Citation: Ranjith AP Quicke DLJ, Reshchikov A, Butcher BA (2024) A new enigmatic genus of the ichneumonid subfamily Ctenopelmatinae (Hymenoptera, Ichneumonidae) from Thailand. Journal of Hymenoptera Research 97: 491-504. https://doi.org/10.3897/jhr.97.121436 Abstract The Ctenopelmatinae is one of the least explored groups of Ichneumonidae in South East Asia. We de- scribe and illustrate an enigmatic new genus, Thaictenopelma Ranjith, Reshchikov & Quicke with the type species, 7’ splendida Ranjith, Reshchikov & Quicke, sp. nov., from a moderately high altitude site in northern Thailand. The new genus shows a unique set of morphological characters that distinguishes it from all other ctenopelmatine genera. The presence of a pair of complete latero-median as well as complete dorso-lateral carinae on the T2 are considered autapomorphic characters of the new genus. Affinities of the new genus within the Ctenopelmatinae are discussed and a note on the taxonomic placement is provided. Keywords Malaise trap, new species, parasitoid wasp, South East Asia, taxonomy Introduction The ichneumonid subfamily Ctenopelmatinae consists of more than 1,500 species be- longing to 113 genera (Yu et al. 2016; Broad et al. 2018; Li et al. 2022; Reshchikov et al. 2022). The subfamily is currently divided into nine tribes (Broad et al. 2018), but Copyright Avunjikkattu P Ranjith et al.. 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. 492 = Avunjikkattu P. Ranjith et al. / Journal of Hymenoptera Research 97: 491-504 (2024) its tribal classification is not stable (Gauld et al. 1997; Bennett et al. 2019) and it has never been recovered as monophyletic in phylogenetic analyses (Quicke et al. 2009; Bennett et al. 2019), possibly being paraphyletic with respect to Mesochorinae, Me- topiinae, Oxytorinae and Tatogastrinae (Quicke et al. 2009; Quicke 2015). The most important characters of ctenopelmatines are the presence of an acute dorsal tooth on the apex of the fore tibia and a dorsal, subapical notch on the ovipositor of most spe- cies, although it is needle-like and lacking the notch in its egg-larval parasitoid mem- bers (most Pionini) (Cameron et al. 2014) as well as in species of some other genera, for example, Lathrolestes Forster (Reshchikov et al. 2010). In other respects, ctenopel- matines exhibit a wide spectrum of morphological characters (Townes 1970; Gauld 1984, Gauld et al. 1997). Species of Ctenopelmatinae are koinobiont endoparasitoids of sawfly (Hymenoptera) larvae and exceptionally of Lepidoptera caterpillars (Seyrig 1928; Heath 1961) and Coleoptera larvae (Barron 1994; Broad et al. 2018). The known Oriental fauna of Ctenopelmatinae comprises 84 species belonging to 29 genera (Yu et al. 2016; Reshchikov et al. 2017a, b, 2022; Reshchikov and van Achterberg 2018; Li et al. 2022). However, since their host sawflies are a predominantly temperate group, it is unsurprising that they are particularly uncommon in tropical re- gions where they are predominantly restricted to montane areas (Malaise 1945; Gauld 1997; Reshchikov 2015; Reshchikov et al. 2018). The South East Asian fauna is par- ticularly poorly known with the only published records being for Gilen Reshchikov & van Achterberg, 2018, Metopheltes Uchida, 1932, Neurogenia Roman, 1910, Rhytida- phora Reshchikov & Quicke, 2022 and Rhorus Forster, 1869 (Reshchikov et al. 2017; Butcher and Quicke 2023), although we have seen specimens of Scolobates Gravenhorst, 1829 from Thailand. Of these, both Gilen and Rhytidaphora were described within the past decade, and the possibility that the recently described Chinese genus, Unicarinata Sheng, Li & Sun, 2022 might also occur in the region cannot be neglected. Here we describe an enigmatic new genus and a species, Thaictenopelma Ranjith, Reshchikov & Quicke (type species: Thaictenopelma splendida Ranjith, Reshchikov & Quicke sp. nov.) from Doi Pha Hom Pok and Doi Phu Kha National Parks, both located in northern Thailand. In Thaictenopelma gen. nov., T2 has a pair of complete latero-median carinae as well as complete dorso-lateral carinae which is a unique com- bination not present in any other members of the subfamily. The new genus and spe- cies are described and comprehensively illustrated photographically, and taxonomic placement of the new genus is discussed. Methods All specimens were collected using Malaise traps set up as part of (i) two-year long sam- pling programme at Doi Phu Kha (2018 and 2022) (ii) from the two year long TIGER sampling programme 2007-2008 across ‘Thailand (for habitat photo see Suppl. material 1), (iii) from Twin Peaks Project, and (iv) Tea Fauna Project (www.teafauna.com) sampling in northern Thailand. In total more than 600 trap months’ worth of catches were sorted. New ctenopelmatine genus from Thailand 493 Images were acquired digitally using the Leica M205 C stereomicroscope with a DMC5400 Camera, stacked in LASX (ver. 3.7.4.23463). Images processed later in Adobe Photoshop. List of repositories CUMZ Chulalongkorn University Museum of Natural History, Bangkok, Thailand QSBG = Queen Sirikit Botanic Garden, Chiang Mai, Thailand Morphological terminology follows Broad et al. (2018) and for cuticular sculpture we follow Harris (1979) and is aligned with the Hymenoptera Anatomy Ontology (HAO) (Yoder et al. 2010). Morphological abbreviations used Fl antennal flagellomere 1 OD the longest diameter of a posterior lateral ocellus OOL the shortest distance between a posterior lateral ocellus and a compound eye POL the shortest distance between the posterior lateral ocelli S1—7 refers to the metasomal sternites 1—7 T1-T7 _ refers to the metasomal tergites 1-7 Results Taxonomy Thaictenopelma Ranjith, Reshchikov & Quicke, gen. nov. https://zoobank.org/A8B80B96-E702-4500-BDC4-70CE265EDB20 Figs 1-5, see Suppl. material 2 Type species. 7haictenopelma splendida Ranjith, Reshchikov & Quicke gen. et sp. nov. Diagnosis. Thaictenopelma gen. nov. can be separated from all other ctenopel- matine genera by its putatively autapomorphic carination pattern of Tl and T2. In particular, the pairs of complete latero-median and dorso-lateral carinae on T2 are completely unknown for the subfamily (Townes 1970). Additionally, the new genus can be distinguished from other ctenopelmatines by a combination of characters viz., the lower tooth of mandible being longer than upper tooth, propodeum with dis- tinct carination, fore wing with rhombic areolet, [2 and T3 with posteriorly diverging groove basally, and T3 with distinct medio-basal protuberances. Description. Female. Head. Eyes glabrous (Fig. 1B, C). Clypeus flat separated from face only by series of punctures (clypeal groove indistinct to absent), apical margin slightly concave (Fig. 1B). Mandible bidentate, lower tooth longer than up- 494 — Avunjikkattu P. Ranjith et al. / Journal of Hymenoptera Research 97: 491-504 (2024) 0.25 mm 0.25 mm Steen Figure |. Zhaictenopelma splendida Ranjith, Reshchikov & Quicke, gen. et sp. nov., holotype, female A habitus, lateral view B head, anterior view C head, antero-lateral view. per tooth, the former more acute (Fig. 1B, C). Face with a short protuberance be- tween antennal sockets (Fig. 1B). Malar space short, subocular sulcus absent (Figs 1B, C, 2B). Occipital carina complete (Fig. 2A, B, Suppl. material 2), joining with hypostomal carina just above base of mandible (Fig. 2B). Ocellar triangle with broad base, anterior ocellus slightly larger than posterior ocellus (Fig. 2A). Frons anteriorly depressed without median sulcus or carina (Fig. 2A). Terminal antennomere acute (Fig. LA). New ctenopelmatine genus from Thailand 495 Figure 2. Thaictenopelma splendida Ranjith, Reshchikov & Quicke, gen. et sp. nov., holotype, female A head, dorsal view B head, ventro-lateral view C mesosoma, lateral view D mesosoma, dorsal view E pro- podeum, dorsal view F T1, dorsal view. Abbreviations: dlc, dorso-lateral carina, lmc, latero-median carina. Mesosoma. Mesosoma longer than high, setose (Fig. 2C). Epomia absent (Fig. 2C). Mesoscutum closely punctate (Fig. 2D). Notauli slightly impressed anteriorly, largely absent posteriorly (Fig. 2D). Mesopleuron closely punctate, smooth medially including speculum (Fig. 2C). Epicnemial carina extending to half height, not joining anterior margin of mesopleuron (Fig. 2C), complete ventrally (see Suppl. material 2). Scuto-scutellar groove smooth, not divided (Fig. 2D). Scutellum slightly bulged in lat- 496 — Avunjikkattu P. Ranjith et al. / Journal of Hymenoptera Research 97: 491-504 (2024) Figure 3. Thaictenopelma splendida Ranjith, Reshchikov & Quicke, gen. et sp. nov., holotype, female A metasoma, lateral view B T1, lateral view C T2—4, dorsal view. Abbreviations: dlc, dorso-lateral carina, Imc, latero-median carina, vlc, ventro-lateral carina. eral view, lateral scutellar carina present only anteriorly (Fig. 2D). Metanotum closely punctate medially, with irregular wrinkles laterally (Fig. 2E). Metapleuron punctate, setose, submetapleural carina strong forming distinct lobe anteriorly, juxtacoxal ca- rina absent (Fig. 2C). Posterior transverse carina complete ventrally. Propodeum with distinct carinae, area basalis transverse, area superomedia hexagonal, as long as wide, smooth, area externa transverse, closely punctate, area dentipara subtriangular, closely New ctenopelmatine genus from Thailand 497 0.25 mm 0.25 mm etal er L 0.25 mm — Figure 4. Thaictenopelma splendida Ranjith, Reshchikov & Quicke, gen. et sp. nov., holotype, female A apex of fore tibia, lateral view B tarsal claw, lateral view C wings. punctate, setose, area petiolaris hexagonal, smooth, setose, area posteroexterna smooth, setose, anterior and posterior transverse carinae present, complete, pleural and lateral longitudinal carinae present, spiracle oval (Fig. 2E). Wings. Fore wing with rhombic areolet (Fig. 4C). Vein 2r&RS originating from the middle of pterostigma (Fig. 4C). Vein 2m-cu with single, rather wide bulla, join- ing areolet medially (Fig. 4C). Vein lcu-a interstitial and declivous (Fig. 4C). Vein CU originating below middle of first subdiscal cell (Fig. 4C). Hind wing with CU&cu-a receiving distal abscissa of CU at middle (Fig. 4C). Legs. Fore tibia with acute lobe apically, with short spine on dorsal margin (Fig. 4A). Fore and mid coxae smooth, hind coxa punctate (Figs 1A, 3A). Tarsal claw sparse- ly pectinate to middle (Fig. 4B). Metasoma. Metasoma coarsely punctate (Figs 2F, 3). T1 setose, transversely, coarse- ly rugose punctate with dorso-lateral carina (dmc) and latero-median carina (Ilmc) com- 498 Avunjikkattu P. Ranjith et al. / Journal of Hymenoptera Research 97: 491-504 (2024) plete to apex, latero-median carinae with a trace of transverse carina extending laterally at apical 2/3", ventro-lateral carina (vlc) present, complete, glymma present basally extending dorsally to join basal depression of tergite (not extending horizontally so that both glymmae are only separated from the dorsal depression by a thin, translucent par- tition), baso-dorsal depression separated by longitudinal tubercle, posterior margin of T1 convex medially, spiracle located slightly anterior to mid-length (Figs 2F, 3A, B). S1 present in basal 14", divided from T1 posteriorly (Fig. 3A, B). T2 coarsely punctate with dorso-lateral and latero-median carinae with a trace of transverse carina extending later- ally at apical 2/3", pair of posteriorly diverging grooves present baso-laterally, spiracle situated at basal 1/3" below lateral longitudinal carina, setose posteriorly (Fig. 3A, C). T3 punctate to rugose punctate (less coarse than T2) with posteriorly diverging groove baso-laterally and a pair of protuberances medio-basally, sparsely setose medially and distinctly setose posteriolry (Fig. 3C). T4—7 closely punctate (less coarse than T3) with- out carinae, setose (Fig. 3A, C). Ovipositor sheath setose (Fig. 3A). Ovipositor with distinct dorsal notch, without dorsal nodus dorso-apically (Fig. 3A, Suppl. material 2). Etymology. The generic name derived from a combination of ‘Thai’ for Thailand and ‘“Ctenopelma, type genus of the subfamily Ctenopelmatinae. Distribution. Thailand. Species included. The genus is described as monotypic. Thaictenopelma splendida Ranjith, Reshchikov & Quicke, sp. nov. https://zoobank.org/290A9FF7-1B38-4EA8-8503-FAE23B475054 Type material. Holotype. THaILanp * 9, Nan Province, Doi Phu Kha National Park; 19°12.236'N, 101°04.667'E, altitude 1,341 m.a.s.l. 5-6 July 2022, Malaise trap, Worapong Atsawasiramanee leg.; Malaise trap (CUMZ). Paratypes: THAILAND * 26, Thailand, Nan province, Pua district, Doi Phu Kha National Park, 19°10.450'N, 101°06.370'E alt. 1677 m, 7—20.ix.2018, Malaise trap, coll. Worapong Atsawasirama- nee (CUMZ); 19, Chiang Mai Province, Doi Pha Hom Pok National Park, Doi Pha Luang; 20°1.06'N, 99°9.581'E, altitude 1,449 m.a.s.l., 27 Jul. — 3 Aug. 2007, Malaise trap, T2932, Wongchai P. leg.; (QSBG); 19 & 14; same sampling data but 3-10 Aug. 2007, T2931, Wongchai P. leg. (QSBG); 14 same sampling data but 7-14 Oct. 2007, T6209, Wongchai P. leg.; (QSBG). Description. Female (holotype): Body length 8.5 mm, fore wing length 7.8 mm. Head. Antenna with 42 flagellomeres, all longer than wide, flagellomeres narrow- ing towards apex, F1 1.5 x as long as F2, Fl & F2 2.4, 1.8 x as long as wide, respective- ly. Scape approximately as long as maximally wide (Fig. 1B). Head transverse 1.5 x as wide as high in anterior view, 1.8 x as wide as long in dorsal view. Face transverse, flat, distinctly punctate with granulate interspace, setose, 2.0 x as long as wide (Fig. 1B). Inner margin of eyes parallel (Fig. 1B). Clypeus transverse, 3.5 x as long as wide, sepa- tated from face by distinct suture (Fig. 1B). Malar space 0.4 x as long as basal width of mandible. Lower tooth of mandible 1.6 x as long as upper tooth. Gena 0.6 x as long New ctenopelmatine genus from Thailand 499 as eye in lateral view, 0.7 x as long as transverse diameter of eye in dorsal view. Frons distinctly punctate with granulate interspace, setose (Fig. 2A). OOL 2.1 x OD; OOL 1.9 x POL. Vertex and occiput distinctly punctate with granulate interspaces (Fig. 2A). Mesosoma. Mesosoma 1.4 x as long as high. Pronotum rugose punctate with in- distinct groove laterally, setose (Fig. 2C). Propleuron distinctly punctate, setose (Fig. 2C). Scutellum 0.7 x as long as wide, moderately punctate with smooth interspace, setose (Fig. 2D). Propodeum with area superomedia 1.0 x as long as wide, anterior transverse carina straight laterally, lateral extension of posterior transverse carina dis- tinctly curved (Fig. 2E). Wings. Pterostigma 3.4 x as long as wide. Fore wing areolet 0.8 x as long as maxi- mum width. Vein 2rs-m 1.5 x as long as 3rs-m. Legs. Hind femur, tibia and basitarsus 5.4, 5.7, 5.9 x as long as its maximum width, respectively. Metasoma. 11 1.0 x as long as its maximum width. T2 0.7 x as long as its maxi- mum width. T2 1.1 x as long as T3. T3 0.6 x as long as its maximum width. Oviposi- tor sheath 0.2 x as long as hind basitarsus. Coloration. Body mostly black except the following yellow: face and clypeus ex- cept medially, mandible except apically, gena postero-basally, frons laterally, pronotum antero- and postero-laterally, mesopleuron posteriorly, scutellum, axilla, metanotum mediobasally and postero-laterally, metapleuron except anterior blackish patch, pro- podeum except area externa, fore leg, mid coxa, mid femora, mid tibia, mid basitarsus except apically, hind coxa dorsally and baso-ventrally, hind tibia medially, T1 medioba- sally, posterior margin of T1, anterior and posterior margin of T2, anterior margin of T3 and ovipositor; the following brown: antenna except medially, hind coxa apico- ventrally, hind trochanter and femur, hind tibia basally and apically, hind basitarsus basal 1/3"* venation, pterostigma, hind basitarsus apically, hind tarsus 2—3, tarsal claw brown; and the following white: antenna medially, medial tarsomere 4—5, hind basi- tarsus apical 2/3", hind tarsomere 2—5. Variation. \n paratypes from Doi Pha Luang antenna with 39 flagellomeres, oc- ciput more strongly concave, area superomedia with transverse carina more strongly arched posteriorly. Clypeus completely black except apically, metapleuron and anterior part of propodeum black, T2 baso-laterally black. Male. Same as female except the following characters; Clypeus transverse, 3.2 x as long as wide, clypeal margin protrtuding anteriorly (Fig. 5A). Scape 1.4 x long as its maximum width (Fig. 5A). Face transverse, flat, shallowly punctate with shagreen matt interspace, setose, 1.6 x as long as wide. Malar space 0.3 x as long as basal width of mandible. Lower tooth of mandible 1.8 x as long as upper tooth. T1 1.5 x as long as its maximum width. T2 0.6 x as long as its maximum width (Fig. 5B). Posterior margin of S4 and S6 rounded, of S5 straight (Fig. 5C). Apex of paramere elongate, its margin round (Fig. 5C). Inner margin of ventral side of paramere parallel at base (Fig. 5C). Tip of aedeagus swollen, decurved, its apex rounded. Yellow colored areas relatively larger than in female, those face and clypeus completely, mesopleuron, middle part of T1 between latero-median carina yellow. 500 = Avunjikkattu P Ranjith et al. / Journal of Hymenoptera Research 97: 491-504 (2024) 0.5 mm Figure 5. Thaictenopelma splendida Ranjith, Reshchikov & Quicke, gen. et sp. nov., paratype, male A head, anterior view B propodeum and T1-3 dorsal view C S4—6 and male genitalia ventral view. Biology. Unknown. Etymology. The species is named after the magnificent combination of morpho- logical characters which are completely unknown from the members of the subfamily. Distribution. Thailand. Discussion The complete lateral longitudinal cartina of T2 is one of the diagnostic characters used by Townes (1970) to recognise the Ctenopelmatini, although this character state is also present in several species in the genera Hadrodactylus Forster, 1869 (Euryproc- tini) and Rhorus (Pionini). However, in members of the Ctenopelmatini, T8 of the female is produced posteromedially between the base of the ovipositor sheath and the cercus whereas in Thaictenopelma gen. nov. T8 apical margin is normal. Further, the New ctenopelmatine genus from Thailand 501 carination pattern of Tl and T2 disagrees with a placement in Ctenopelmatini as all carinae (dorso-lateral and latero-median) are extended up to the posterior margins of the tergites. The complete propodeal carination of Thaictenopelma gen. nov., including a completely defined area superomedia, is a putatively plesiomorphic character state found in the Pionini Smith & Shenefelt, 1955 (most genera) and Perilissini Thomson, 1883 (Lathrolestes Forster, 1869 and Perilissus Forster, 1855), and only a few cten- opelmatines (Austropion Gauld, 1984, Hodostates Forster, 1869, Glyptorhaestus Thom- son, 1894, Phaestus Forster, 1869, Petilium Townes, 1970, Lathrolestes and Perilissus) (Townes 1970; Gauld 1984, Gauld et al. 1997). The new genus appears most similar to the pionine, Austropion from Australia (Gauld 1984), but 7haictenopelma gen. nov., which also has the ovipositor with a dis- tinct (albeit shallow) pre-apical dorsal notch (Suppl. material 2), but can be clearly distinguishable from Austropion by a combination of following characters; the lower tooth of the mandible longer than the upper tooth (upper tooth longer that lower tooth in Austropion), the occipital carina complete (obsolescent in Austropion), the fore wing areolet broad basally (petiolate in Austropion), T1 with complete dorso-lateral carina (carina absent in apical half in Austropion), T2 with a pair of complete latero-median and dorso-lateral carinae (smooth without carinae in Austropion), and the ovipositor without an acute dorsal process (with acute dorsal process in Austropion). Gauld (1984) placed Austropion in the Pionini based on carination but noted that it was rather aber- rant. The only other genus tradionally placed in the Pionini with an ovipositor notch is Hodostates Foerster, 1869, and based on this character, Cameron et al. (2011) stated that they “... are confident in rejecting Hodostates from Pionini’, but the combined mo- lecular and morphological analyses of Quicke et al. (2009) recovered Hodostates deeply nested among other Pionini genera and thus it appears that a notched ovipositor is likely to be homoplastic within the subfamily as noted by Cameron et al. (2011). Thaictenopelma gen. nov. is also similar to the Priopoda group of genera (Perilissini) by having the occipital carina joining with hypostomal carina at base of mandible (Fig. 2B, Suppl. material 2). Within Gilen, Neurogenia, Priopoda Holmgren, 1856 and Lath- rolestes, the new genus is most closely resemble Gi/en by having T2—3 with a broad sub- apical transverse impression and T2 lateral longitudinal carina but readily discriminate by lacking produced mid-longitudinal facial projection and having distinct complete latero-median carina of T2. Due to the presence of rather mixed combination of morphological characters displayed in different tribes (Ctenopelmatini, Perilissini and Pionini) we refrain from assigning the new genus to any of the extant tribes and we prefer to keep it as incertae sedis within the Ctenopelmatinae, although on balance it seems most probable that belongs to the Perilissini. Similar conditions have been found in a couple of genera like Labrossyta Forster, 1869 and Hodostates (Townes 1970). All these strongly point to the need for comprehensive analyses of the tribal classification of the Ctenopelmatinae. Finally, at the only two known localities, the new species seems either to be very uncommon or not to get collected easily in Malaise traps, since we only found seven individuals from more than 600 Malaise trap months’ (>50 years) of sampling. 502 Avunjikkattu P. Ranjith et al. / Journal of Hymenoptera Research 97: 491-504 (2024) Acknowledgements We are grateful to thank Mr. Chatchai Yothawut, Director of Doi Phu Kha National Park, and Mr. Phasin Inkeaw, and Mr Kenneth Rimdahl (Monsoon Tea) for provid- ing facilities, and cooperation during field trips, Prof Michael Sharkey (University of Kentucky) and Dr. Wichai Srisuka (QSBG) for providing samples of TIGER and Twin Peaks projects. APR was supported by a postdoctoral fellowship from the Rachada- phiseksomphot Fund, Graduate School, Chulalongkorn University. DLJQ was sup- ported by a senior postdoctoral fellowship from the Rachadaphiseksomphot Fund, Graduate School, Chulalongkorn University. This research is financially supported by the Thailand Science Research and Innovation Fund Chulalongkorn University and Rachadaphiseksomphot Fund, CU (RU66_008_2300_002) and RSPG Chula to BAB. We thank the section Editor, Drs Andrew Bennett, Filippo Di Giovanni and an anonymous reviewer for the constructive comments and suggestions. References Barron JR (1994) The Nearctic species of Lathrolestes (Hymenoptera, Ichneumonidae, Cten- opelmatinae). Contributions of the American Entomological Institute. 28(3): 135. Bennett AMR, Cardinal S, Gauld ID, Wahl DB (2019) Phylogeny of the subfamilies of Ich- neumonidae (Hymenoptera). Journal of Hymenoptera Research 71: 1-156. https://doi. org/10.3897/jhr.7 1.32375 Broad GR, Shaw MR, Fitton MG (2018) Ichneumonid wasps (Hymenoptera: Ichneumoni- dae): their classification and biology. Handbooks for the Identification of British Insects 7(12): 1-418. Butcher BA, Quicke DL] (2023) Parasitoids Wasps of South East Asia. CABI, Wallingford, 440 pp. https://doi.org/10.1079/9781800620605.0000 Cameron MD, Wharton RA (2011) Revision of Hodostates (Hymenoptera: Ichneumonidae: Ctenopelmatinae), with a discussion of tribal placement. The Canadian Entomologist 143(2): 136-156. https://doi.org/10.4039/n10-054 Cameron MD, Wharton RA, Restuccia DM (2014) A morphological assessment of the ovi- positor in the subfamily Ctenopelmatinae (Hymenoptera: Ichneumonidae) with specific reference to variation in the subapical, dorsal notch and its evolutionary significance. In: Trud Ruskava entomoligicheskava obshtestva [Tpyapr Pycckoro sHTOMOAOrHM4eCcKOrO o6mectsa] 77-90. https://doi.org/10.47640/1605-7678_2014_85_1_77 Gauld ID (1984) An introduction to the Ichneumonidae of Australia. British Museum (Natu- ral History), Publication No. 895, 1-413. Gauld ID, Wahl D, Bradshaw K, Hanson P, Ward S (1997) The Ichneumonidae of Costa Rica 2. Introduction and keys to species of the smaller subfamilies, Anomaloninae, Ctenopelmatinae, Diplazontinae, Lycorininae, Phrudinae, Tryphoninae (excluding Netelia) and Xoridinae, with an appendix on the Rhyssinae. Memoirs of the American Entomological Institute 57: 1-485. Harris RA (1979) A glossary of surface sculpturing. California Department of Food and Agri- culture, Bureau of Entomology, Occasional Paper, No. 28, 1-31. New ctenopelmatine genus from Thailand 503 Heath J (1961) Some parasites of Eriocraniidae (Lep.). Entomologist’s Monthly Magazine. 97 163. Li T, Sun S-P, Sheng M-L (2022) A new genus and species of Ctenopelmatinae (Hymenoptera, Ichneumonidae) from China. Journal of Hymenoptera Research 92: 199-210. https://doi. org/10.3897/jhr.92.84969 Malaise RE (1945) “Tenthredinoidea” of South-Eastern Asia: with a General Zoogeographical Review. Entomologiska sallskapet 1945: 312. Quicke DLJ, (2015) The Braconid and Ichneumonid Parasitoid Wasps: Biology, System- atics, Evolution and Ecology. John Wiley & Sons, Chichester, 752 pp. https://doi. org/10.1002/9781118907085 Quicke DLJ, Laurenne NM, Fitton MG, Broad GR (2009) A thousand and one wasps: a 28S rDNA and morphological phylogeny of the Ichneumonidae (Insecta: Hymenoptera) with an investigation into alignment parameter space and elision. Journal of Natural History 43: 1305-1421. https://doi.org/10.1080/00222930902807783 Reshchikov A (2015) The world fauna of the genus Lathrolestes (Hymenoptera, Ichneumoni- dae). Tartu 2015, 247 pp. https://doi.org/10.13140/RG.2.1.3969.4240 Reshchikov A, van Achterberg C (2018) The Unicorn exists! A remarkable new genus and spe- cies of Perilissini (Hymenoptera: Ichneumonidae) from South East Asia. Acta Entomolog- ica Musei Nationalis Pragae 58(2): 523-529. https://doi.org/10.2478/aemnp-2018-0041 Reshchikov A, Soper A, Van Driesche R (2010) Review and key to Nearctic Lathrolestes Forster (Hymenoptera: Ichneumonidae), with special reference to species attacking leaf mining tenthredinid sawflies in Betula Linnaeus (Betulaceae). Zootaxa 2614(2614): 1-17. https:// doi.org/10.11646/zootaxa.2614.1.1 Reshchikov A, Choi J-K, Xu Z-F, Pang H (2017a) Two new species of the genus Rhorus Forster, 1869 from Thailand (Hymenoptera, Ichneumonidae). Journal of Hymenoptera Research 54: 79-92. https://doi.org/10.3897/jhr.54.11662 Reshchikoy A, Xu Z-f, Pang H (2017b) First record of the genus Lethades Davis, 1897 from the Oriental region, with description of a new species (Hymenoptera, Ichneumonidae, Cten- opelmatinae). ZooKeys 644: 43-50. https://doi.org/10.3897/zookeys.644.10491 Reshchikov A, Saaksjarvi IE, Pollet M (2018) Review of the New World genus Nanium Townes, 1967 (Hymenoptera: Ichneumonidae: Ctenopelmatinae), with two new species from the Neotropical region. European Journal of Taxonomy 459: 1-18. https://doi.org/10.5852/ ejt.2018.459 Reshchikov A, Quicke DLJ, Butcher BA (2022) A remarkable new genus and species of Eu- ryproctini (Hymenoptera: Ichneumonidae, Ctenopelmatinae) from Thailand. European Journal of Taxonomy 834: 102-116. https://doi.org/10.5852/ejt.2022.834.1903 Seyrig A (1928) Note sur les Ichneumonides du Museum national d’Histoire naturelle. Bulletin du Muséum National d’Histoire Naturelle, Paris 34: 259-265. Townes HK (1970) The genera of Ichneumonidae, Part 3. Memoirs of the American Entomo- logical Institute 13: 1-307. Yoder MJ, Miko I, Seltmann KC, Bertone MA, Deans AR (2010) A gross anatomy ontology for Hymenoptera. PLOS ONE 5(12): e15991. https://doi-org/10.1371/journal.pone.0015991 Yu DSK, van Achterberg C, Horstmann K (2016) Taxapad 2016, Ichneumonoidea 2015. Da- tabase on flash-drive, Nepean, Ontario, Canada. 504 Avunjikkattu P Ranjith et al. / Journal of Hymenoptera Research 97: 491-504 (2024) Supplementary material | Type locality of Thaictenopelma splendida Ranjith, Reshchikov & Quicke gen. et sp. nov. Authors: Avunjikkattu P. Ranjith, Donald L. J. Quicke, Alexey Reshchikov, Buntika A. Butcher Data type: pdf Copyright notice: This dataset is made available under the Open Database License (http://opendatacommons.org/licenses/odbl/1.0/). The Open Database License (ODDbL) is a license agreement intended to allow users to freely share, modify, and use this Dataset while maintaining this same freedom for others, provided that the original source and author(s) are credited. Link: https://doi.org/10.3897/jhr.97.121436.suppl1 Supplementary material 2 Thaictenopelma splendida Ranjith, Reshchikov & Quicke gen. et sp. nov. Authors: Avunjikkattu P. Ranjith, Donald L. J. Quicke, Alexey Reshchikov, Buntika A. Butcher Data type: pdf Copyright notice: This dataset is made available under the Open Database License (http://opendatacommons.org/licenses/odbl/1.0/). The Open Database License (ODDbL) is a license agreement intended to allow users to freely share, modify, and use this Dataset while maintaining this same freedom for others, provided that the original source and author(s) are credited. Link: https://doi.org/10.3897/jhr.97.121436.suppl2