Abstract
Podonychus gyobusp. nov., a second species of the genus Podonychus Jäch & Kodada, 1997, hitherto known only from Indonesia, is described from Kyushu, Japan. This new species is similar to P. sagittarius Jäch & Kodada, 1997, but differs from it in the straight penis, arcuate 2nd labial palpomere, and in the 3rd antennomere being longer than wide. The endophallic structures and the larva of P. gyobusp. nov. are described. A character matrix of the Macronychini genera and a key to the Japanese genera are provided.
Highlights
The riffle beetle fauna of Japan is well studied and 17 genera with 57 species are reported so far (Kamite et al 2018)
After repeated field investigation and closer examination, it was clear that the specimens represent a new species, closely related to P. sagittarius Jäch & Kodada, 1997. We describe this new species including endophallic structures and the larva
All specimens of the new species were collected from the submerged roots of reeds, and we think this microhabitat is important for the genus
Summary
The riffle beetle fauna of Japan is well studied and 17 genera with 57 species are reported so far (Kamite et al 2018). The genus Podonychus Jäch & Kodada, 1997 (Elminae, Macronychini) was hitherto known only from Siberut Island, Indonesia (Jäch et al 2016). It has been regarded as monotypic so far. We describe this new species including endophallic structures and the larva
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