The first hygropetric Platynectes and its larva from eastern China (Coleoptera: Dytiscidae)

Abstract

Abstract Platynectes (Gueorguievtes) davidorum sp. nov. is described, including all larval instars, from hygropetric habitats in Fujian and Zhejiang provinces, eastern China. The new species can be easily distinguished from all other Asia Platynectes Régimbart, 1879 with dorsally strongly convex habitus, distinctly impressed double reticulation of elytra, short appendages and the shape of median lobe of aedeagus. Collected larvae were successfully associated with adults using a molecular approach and the barcode for the new species is provided as well as the phylogenetic position based on the mitochondrial cytochrome oxidase I gene; they are described and illustrated, with detailed morphometric and chaetotaxic analyses of the cephalic capsule, head appendages, legs, last abdominal segment, and urogomphi. The classification of the new species within the subgenus Gueorguievtes Vazirani, 1976, and its adaptation to hygropetric habitats are briefly discussed.