The oldest fossil Ochodaeidae (Coleoptera: Scarabaeoidea) from the Middle Jurassic of China Author Ren, Dong text Zootaxa 2010 2553 65 68 journal article 10.5281/zenodo.196844 2fb3fe46-d3e3-4cda-a575-b7a8caa1b5d4 1175-5326 196844 Mesochodaeus daohugouensis sp. nov. ( Figs. 1 , 2 ) Holotype : CNU-COL-NN2009728, imprint of dorsal view, with good visible antennal club and left middle leg. Etymology: The name of the new species is given for the locality where the fossil was collected. Description : Body length 11.05 mm (excluding the apex of pygidium). Labrum bilobed. Anterior margin of clypeus nearly straight. Head slightly wider than long. Frons with two tubercles at anterior margin. Pronotum emarginate laterally, with arcuate lateral edges. Scutellum triangular. Elytra with striae, slightly wider than prothorax. Mesotibia distinctly longer than mesotarsus. Mesotarsomere 1 somewhat longer than mesotarsomeres 2 and 3 combined. FIGURE 1. Photograph of the holotype of Mesochodaeus daohugouensis . FIGURE 2. Mesochodaeus daohugouensis holotype, dorsal view. FIGURES 3–5. Mesozoic (Lower Cretaceous) Ochodaeidae : 3— Cretochodaeus mongolicus ; 4— C. striatus ; 5— Lithochodaeus cretaceus . Measurements: Body length 11.05 mm (excluding the apex of pygidium); width of head 2.5 mm ; median length of pronotum 2.5 mm , width 4.7 mm ; elytron length at least 7.1 mm , width 3.4 mm ; mesotibia length 2.3 mm ; mesotarsus length 1.9 mm . Remark: A comparison and diagnosis of the new species with other Mesozoic Ochodaeidae is given in the key below.