Trichagalma formosana Melika & Tang, 2010

Trichagalma formosana Melika & Tang, 2010 in Melika et al. (2010: 11), ǒ.

Distribution. Korean Peninsula (Pujade-Villar et al. 2020a: 1217) and Taiwan (Melika et al. 2010: 13).

Remarks. Trichagalma formosana has two different subspecies: ‘ formosana ’ from Taiwan and ‘ romevai ’ from China and Korea; although the galls are identical, some morphological differences of the adults (Pujade-Villar et al. 2020a) suggest that they could be two different species.

Biology. Only the asexual generation has been described, which induces detachable twig galls on Q. acutissima and Q. variabilis (sect. Cerris) (Table 1; Melika et al. 2010; Pujade-Villar et al. 2020a).