Discovery of the chelonine tribeAdeliini Viereck, 1918 (Hymenoptera: Braconidae) from the Indian subcontinent with the description of a new genus from south India Author Ranjith, A. P. Insect Ecology and Ethology Laboratory, Department of Zoology, University of Calicut, Kerala, Pin: 673635, India Author Achterberg, C. Van 0000-0002-6495-4853 Department of Terrestrial Zoology, Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, the Netherlands kees @ vanachterberg. org; https: // orcid. org / 0000 - 0002 - 6495 - 4853 kees@vanachterberg.org Author Samartsev, K. G. 0000-0002-9920-7583 Laboratory of Experimental Entomology, Zoological Institute, Russian Academy of Sciences, 1 Universitetskaya naberezhnaya, Saint Petersburg 199034, Russia. k. samartsev @ gmail. com; https: // orcid. org / 0000 - 0002 - 9920 - 7583 k.samartsev@gmail.com Author Nasser, M. 0000-0002-6460-1839 Insect Ecology and Ethology Laboratory, Department of Zoology, University of Calicut, Kerala, Pin: 673635, India & drnasher @ gmail. com; https: // orcid. org / 0000 - 0002 - 6460 - 1839 drnasher@gmail.com text Zootaxa 2021 2021-02-04 4926 1 1 25 journal article 8321 10.11646/zootaxa.4926.1.1 42f6270b-393f-491a-aa48-78f60f28eeec 1175-5326 4500470 F151B4E4-26FD-42CE-9F4D-0D8931AAF93F Tribe Adeliini Viereck, 1918 Diagnosis. Head transverse, sculptured ( Figs 1B , 3D , 5B , 7B , 9C , 11K , 12I , 13B , 15C , 17B ); ocelli small; frons flat or concave medially, with or without midlongitudinal groove ( Figs 1C , 4C , 5C , 7C , 9D , 11C , 12C , 13C , 15D , 17C ); eyes setose ( Figs 1B , 3D , 5B , 7B , 12I , 13B , 15C , 17B ) or glabrous ( Figs 9C , 11K ); malar suture complete and deep ( Figs 1E , 3D , 5D & E , 7D , 10B & E , 11I & K , 15E ); occipital carina often complete, joining hypostomal carina ventrally ( Figs 4A , 6A , 8A , 10A , 14A , 16A ), rarely absent ventrally ( Figs 1A & E ) (in Carinadelius gen. nov. ) without joining hypostomal carina; palps short and thick, maxillary palp often 5-segmented ( Figs 1E , 4A , 13E ) rarely 3-segmented ( Fig. 12F ) (in Paradelius ), labial palp 3-segmented; antenna more or less thickened, 20–22 antennomeres; scape rather long, wide; pedicel short; first flagellomere longer than second; subapical flagellomeres of female quadrate in several species ( Figs 2A , 5A , 7C ); tentorial pits deep ( Figs 1B , 3D , 5B , 7B , 9C , 11K , 12I , 13B , 15C , 17B ); clypeus smooth or sculptured ( Figs 1B , 3D , 5B , 7B , 9C , 11K , 12I , 13B , 15C , 17B ); labrum concealed by clypeus ( Figs 1B , 3D , 5B , 7B , 9C , 11K , 12I , 13B , 15C , 17B ); mesosoma often dorso-ventrally flattened ( Figs 1E , 4B , 6B , 7F , 10B , 11I , 13E , 15E , 17E ); propleuron short, crenulate posteriorly ( Figs 1E , 4B , 6B , 7F , 10B , 11I , 13E , 15E , 17E ); propleural lobe distinct or indistinct ( Figs 1E , 4B , 6B , 7F , 10B , 11I , 13E , 15E , 17E ); mesoscutum smooth to sculptured ( Figs 1D , 4C , 5F , 7E , 9F , 11L , 12B , 13D , 15D , 17C ); notauli absent ( Figs 1D , 4C , 5F , 7E , 9F , 11L , 12B , 13D , 15D , 17C ); prepectal carina often absent ( Figs 1E , 4B , 6B , 7F , 10B , 11I , 13E , 15E ), rarely present ( Fig. 12H , 17E ) (in Sinadelius and Paradelius ); postpectal carina absent ( Fig. 9E ); scutellar sulcus narrow, crenulated ( Figs 1D , 4C , 5F , 7E , 9F , 11L , 12B , 13D , 15D , 17C ); mesopleuron convex, smooth or sculptured ( Figs 1E , 4B , 6B , 7F , 10B , 11I , 12H , 13E , 15E , 17E ); precoxal sulcus smooth or crenulate entirely ( Figs 1E , 4B , 6B , 7F , 10B , 11I , 12H , 13E , 15E , 17E ); metapleuron smooth ( Figs 1E , 7F , 10B , 13E , 17E ) or rugose ( Figs 4B , 6B , 15E ); propodeum smooth or sculptured, often areolate, either divided into distinct anterior and posterior part or not ( Figs 1F , 4D & E , 6C , 8B , 10C & D , 11D , 12B , 13F , 14B , 16B , 17F , 18A ), rarely with distinct midlongitudinal carina and vertical lateral carina posteriorly ( Fig. 1F ) (in Carinadelius gen. nov. ); propodeal spiracles round; fore wing hyaline ( Figs 7A , 10E , 11A , 12A , 14C , 18C ) or infuscated ( Figs 2C , 4F , 6D , 16C ); pterostigma wide; vein 1-R1 distinct, long ( Figs 2C , 4F , 6D , 10E , 12A , 14C , 18C ) to nearly absent ( Figs 7A , 9A , 11A ); fore wing vein r present ( Figs 7A , 9A , 11B & F ) or absent ( Figs 2C , 4F , 6D , 12A , 14C , 18C ); vein r-m absent ( Figs 2C , 4F , 6D , 7A , 10E , 11A , 12A , 14C , 16C , 18C ); vein SR1 not reaching wing margin; vein 1SR+M either connected with parastigma or 1-M; vein m-cu often postfurcal or interstitial ( Figs 2C , 4F , 6D , 7A , 10E , 11A , 12A , 14C , 16C , 18C ); vein M+CU straight or distinctly curved ( Figs 2C , 4F , 6D , 7A , 10E , 11A , 12A , 14C , 16C , 18C ); vein cu-a antefurcal, interstitial or postfurcal ( Figs 2C , 4F , 6D , 7A , 10E , 11A , 12A , 14C , 16C , 18C ); subdiscal cell open; hind wing with 3 hamuli; basal cell of hind wing narrow; mid coxa with transverse groove dorsally ( Figs 4B , 6B , 7F , 16D ); hind coxa smooth or rugose; hind femur and tibia flattened; hind tibial spurs long, inner spur approx. 0.5 × as long as basitarsus; hind basitarsus long, 0.8–0.9 × as long as combined length of 2 nd– 5 th tarsomeres; tarsal claws short, simple ( Fig. 12E ); metasoma smooth or sculptured ( Figs 2B , 4E , 6C , 8B , 10D , 11D , 12G , 14B , 16B , 18A ), often compressed dorso-ventrally; metasomal tergites 1–3 formed into carapace, smooth or rugose; first and second metasomal suture present ( Figs 12G , 14B , 16B , 18A ) or absent ( Figs 2B , 4E , 6C , 8B , 10D , 11D , 16B ); spiracle of metasomal tergites 6–7 absent; ovipositor short, always less than 0.25 × as long as hind tibia. Genera included . Adelius Haliday , Carinadelius Ranjith & van Achterberg , gen. nov. , Myriola Shestakov reinstated , Paradelius de Saeger , Sinadelius He & Chen , and Sculptomyriola Belokobylskij. Distribution . Cosmopolitan. Biology . Solitary endoparasitoids of leaf-mining Nepticulidae . Comments . Shimbori et al . (2019) discussed possible apomorphic and synapomorphic character states between Cheloninae and Adeliini . Apart from the synapomorphic characters, the number of antennomeres is considered as plesiomorphic character to some extent (E.M. Shimbori, personal communication). Within the tribe it has been also found ( Kittel & Austin 2014 ; Kittel et al . 2015 , 2016 ) that the division of the propodeum into distinct anterior and posterior parts (in Adelius , Sinadelius and Sculptomyriola ) is a plesiomorphic character as it is absent in other genera (in Carinadelius gen. nov. , Myriola and Paradelius ). It is suggested that the new genus Carinadelius is probably derived from the genus Adelius .