Earliest teredid beetle from mid-Cretaceous amber of northern Myanmar (Coleoptera: Coccinelloidea: Teredidae): new genus and species Author Li, Yan-Da State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences. Nanjing 210008, China. & Bristol Palaeobiology Group, School of Earth Sciences, University of Bristol. Life Sciences Building, Tyndall Avenue, Author Huang, Di-Ying State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences. Nanjing 210008, China. cycai@nigpas.ac.cn Author Cai, Chen-Yang State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences. Nanjing 210008, China. & Bristol Palaeobiology Group, School of Earth Sciences, University of Bristol. Life Sciences Building, Tyndall Avenue, text Zoologia 2022 e 22042 2022-12-16 39 1 9 http://dx.doi.org/10.1590/s1984-4689.v39.e22042 journal article 300549 10.1590/S1984-4689.v39.e22042 ec400598-f3ab-464c-9507-2e9039e7749a 1984-4689 13173808 Delteredolaemus hei Li & Cai sp. nov. Figs 1–17 https://zoobank.org/ 30C72903-95AF-4730-AC7A-CD6298FDE330 Material. Holotype , NIGP200000 . Locality and horizon. Amber mine located near Noije Bum Village, Tanai Township, Myitkyina District, Kachin State , Myanmar ; unnamed horizon, mid-Cretaceous (Upper Albian to Lower Cenomanian; Shi et al. 2012 , Mao et al. 2018 ). Diagnosis. As for the genus. Description. Body elongate, cylindrical, about 1.75 mm long, 0.45 mm wide, widest in anterior part of abdomen; surface with scattered setae. Head ( Fig. 7 ) prognathous, widest across the eyes. Compound eyes ( Fig. 7 ) finely facetted, without interfacetal setae. Antennal insertions ( Fig. 16 ) exposed from above. Antennae ( Figs 7 , 17 ) likely 11-segmented; antennomere 1 robust; antennomeres 1–4 progressively narrower; antennomeres 10 and 11 forming a relatively compact club; antennomeres 1–9 with scattered long setae only; antennomere 11 with dense sensorial setae. Mandibles ( Fig. 7 ) (at least) bidentate. Maxillary palps ( Fig. 7 ) 4-segmented, with apical palpomere subconical. Labial palps ( Fig. 7 ) with apical palpomere likely cylindrical. Pronotal disc about 1.4 times as long as wide; surface without special modifications (carinae, cavities, grooves, or paired impressions); posterior pronotal edge posteriorly produced at middle, forming rather distinct angle ( Fig. 12 ); lateral pronotal carinae complete ( Fig. 15 ). Notosternal suture complete ( Fig. 15 ). Prosternal process either absent or completely concealed by projecting procoxae ( Fig. 8 ). Procoxae ( Fig. 8 ) projecting and contiguous (status of coxal cavities unknown). Scutellar shield ( Fig. 12 ) small and rounded. Elytra ( Fig. 3 ) elongate; surface with clear puncture rows, without costae; scutellar striole absent; epipleura narrow. Mesoventrite ( Fig. 9 ) without median carina; mesoventral process well-developed, slightly broadened at middle, apically narrowly rounded. Mesocoxal cavities narrowly separated ( Fig. 9 ). Metaventrite anteromedially tumid ( Figs 6 , 9 ); median discrimen absent. Metacoxae ( Fig. 10 ) transversely oval, narrowly separated. Legs well-developed, slender. Trochanters large and well visible, with strongly oblique trochanterofemoral joint ( Figs 8–10 ). Tibiae with spines present at outer apical angle only ( Figs 8–10 ); tibial spurs 2-2-2, well-developed ( Figs 8–10 ). Tarsi all 4-segmented; tarsomeres simple, unlobed ( Figs 8–10 ). Pretarsal claws simple; empodium present, bisetose. Abdomen with five ventrites ( Figs 10, 11 ). Ratio of ventrite lengths along middle: 3.8:1.3:1.1:1.0:1.5. Ventrite 1 with intercoxal process narrow and apically acuminate ( Fig. 10 ). Etymology. The species is named after Mr. Hai-Kun He ( Guangdong , China ), who kindly donated many fossils for our research.