New fossil taxa and notes on the Mesozoic evolution of Liadytidae and Dytiscidae (Coleoptera) Author Prokin, Alexander A. Author Petrov, Pyotr N. Author Wang, Bo Author Ponomarenko, Alexander G. text Zootaxa 2013 3666 2 137 159 journal article 10.11646/zootaxa.3666.2.2 930d392c-8720-4820-85eb-501985209cf3 1175-5326 220466 1F8D4E8A-2447-4556-9B98-D8229D858194 Cretodytes incertus sp. n. Etymology : From the Latin incertus (unclear); adjective in the nominative singular. Material : Holotype PIN 4626/628, direct impression of beetle without head, prothorax and legs; Chernovskiye Kopi (also transliterated as Chernovskie Kopi), Transbaikalia, Russia , left bank of the Ingoda River, Late Jurassic – Early Cretaceous , Doronino Formation. Description ( Figs 19, 20 ): Small oval light beetle. Elytron thin, wing venation visible as loop at base of oblongum. Maximum body width situated at level of middle of metacoxal plates. Mesocoxae rounded. Metacoxal plate 3.3 times as long as lateral lobe of metaventrite (LC/LV = 3.3). Metacoxal processes rounded, slightly elevated above metacoxal plates. Measurements : Body length, probably around 7 mm ; body width, 3.6 mm ; elytron length, 5.3 mm . Comparison : The new species differs from C. latipes Ponomarenko, 1977 in the smaller body length and width and shorter lateral lobe of the metaventrite and metacoxal processes.