Palaeodytes

Prokin, Alexander A., Petrov, Pyotr N., Wang, Bo & Ponomarenko, Alexander G., 2013, New fossil taxa and notes on the Mesozoic evolution of Liadytidae and Dytiscidae (Coleoptera), Zootaxa 3666 (2), pp. 137-159 : 151

" Palaeodytes " incompletus Ponomarenko, Coram & Jarzembowski, 2005

This species was recently described from the Berriasian Purbek Limestone Group, UK. Its body outline is uncharacteristic of Palaeodytes (cf. fig. 4 in Ponomarenko et al. 2005: 280) and its lateral lobe of the metaventrite has a peculiar shape (resembling, e.g., that of the recent dytiscid Ilybius fenestratus (Fabricius, 1781) , although it may be distantly related), with the posterior and anterior margins strongly converging and then slightly diverging again, and converging again near the epipleuron. The genus to which the species belongs is similar in morphological parameters to several recent genera of the family, and it is difficult to provide a diagnosis based on what is known about it. Having at present no opportunity to re-examine the holotype of this species in search of possible distinguishing characters of the genus, we refrain from describing the new genus here. Therefore, in this study the species is provisionally referred to hereinafter as " Palaeodytes " incompletus .