New Species of Gall-inducing Psyllids of Petalolyma (Triozidae) from Taiwan

This study reviews the gall-inducing psyllid genus Petalolyma Scott, 1882 and synonymizes the monotypic genus Torulus Li, 1991 as its junior synonym. A new species, Petalolyma vittata Liao & Burckhardt, is described and illustrated, including both adults and fifth-instar immatures. This species induces marginal fold galls on leaves of Ilex ficoidea (Aquifoliaceae). Additionally, a replacement name, Petalolyma lii Liao & Burckhardt, is proposed to resolve a secondary homonym. New descriptions of the previously unknown male of P. lii and the female of P. nigra are also provided. The study further revises the taxonomy by synonymizing Petalolyma castanopsis Li & Yang, 1991 and P. fujianensis Li & Yang, 1999 and considering P. hyalina (Kuwayama, 1910) a nomen dubium. A total of 13 valid Petalolyma species are discussed, highlighting their host plants and biogeographic patterns. Identification keys for the adults and fifth-instar immatures of Taiwanese species are included.

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