The Phylliidae Study Group (PSG) was formed in 1952 to foster the study of Phylliidae, a family which contains the extant true leaf insects. These creatures are often called walking leaves, and are some of the most remarkable leaf mimics in the entire animal kingdom. The group currently has a few hundred members worldwide with the majority of its members in Japan. The membership ranges from young children to professional entomologists. The PSG holds regular meetings and presents displays at all the major entomological exhibitions around the world. It emphasises study by rearing and captive breeding and has a panel of breeders who distribute livestock to other members.

The PSG also publishes the journal, Phylliidae Studies.

Typically, the Phylliidae Studies journal is produced biannually in May and December. It contains news items, livestock information, culture news, details of exhibitions and meetings, as well as a variety of short articles on all aspects of Phylliidae.

Details of membership may be obtained from the Membership Secretary, Masaru Mukai, The Institute of Critical Zoologists, 9-83, Ueno Park, Taito-ku, Tokyo, 110-8711, Japan.

Annual subscription rates are currently: Japan 6000¥; Europe €80; Worldwide; US$110.