The Japanese endemic Sympetrum frequens is considered as the insular vicariant of S. depressiusculum, widely distributed in the Eurasian Continent. In Korea, morphologically intermediate specimens have been collected, mixed with typical S. depressiusculum. The taxonomical status of these two species is thus questionable. To clarify their status, sequencing of mitochondrial 16S ribosomal RNA (rRNA) was…
The hatching phenology of 15 Odonata species was studied under seminatural conditions to find out how the hatching modes of typical species of summer dry temporary waters (vernal ponds) differ from those of species inhabiting both permanent and temporary waters. We attempt to answer the following questions. (1) Do vernal pond species hatch earlier in…