My research uses DNA sequence data to elucidate the phylogeny, phylogeography, and population diversity of insects. Projects currently underway include 1) the molecular phylogeny of fruit flies (family Drosophilidae); 2) the molecular phylogeography of ladybird beetles (subfamily Epilachninae); and 3) the population genetics of East Asian eplachnine beetles.
Insects are thought to be consist of about more than a half of all the species described to date. Thus, studying the evolution of insects will play an important role to understand the diversity of life on earth.
- Katoh T, Izumitani HF, Yamashita S, Watada M (2016) Multiple origins of Hawaiian drosophilids: Phylogeography of Scaptomyza Hardy (Diptera: Drosophilidae). Entomological Science, doi: 10.1111/ens.12222.
- Katoh T, Koji S, Ishida TA, Matsubayashi KW, Kahono S, Kobayashi N, Furukawa K, Viet BT, Vasconcellos-Neto J, Lange CN, Goergen G, Nakano S, Li NN, Yu GY, Katakura H (2014) Phylogeny of Epilachna, Henosepilachna, and some minor genera of phytophagous ladybird beetles (Coleoptera: Coccinellidae: Epilachninae: Epilachnini), with an analysis of ancestral biogeography and host-plant utilization. Zoological Science 31: 820-830.
- Katoh T (2011) Progress and prospects of the molecular phylogenetic studies of Drosophilidae. Low Temperature Science 69: 1-9. (In Japanese with English abstract)