My primary research focuses on the evolution and biogeography of invertebrate animals. Current projects include a multidisciplinary study to "Assembling the Protostome Tree of Life", a project on the "Systematics, Biogeography and Evolutionary Radiations of Cyphophthalmi (Arachnida, Opiliones)" and a collabortive PEET sponsored research project on "Systematics and Monography of Araneoid Spiders". I am also interested in philosophical aspects of sequence data analysis, emphasizing homology-related issues.