Kokkocynips panamensis induces an elongated multilocular swelling gall in young stems, oval to spindle-shaped, with the same colour and surface texture as the bark of twigs (Figs. 4D & E). The galls have an average length of 35 mm (range 20 to 60 mm) and diameter 51 mm (range 30 to 85 mm) (n = 12). The internal structure of the gall is highly lignified and is multilocular, containing several larval cells (Figs. 4C, 4D and 11H). The outer layers crack and peel in older galls.

Host plant: Quercus salicifolia Née (Fagaceae, Quercus sect. Lobatae).Distribution: Kokkocynips panamensis was found from 1,400–1,800m above sea level at Volcán Barú and El Salto, Chiriquí Province, Panama.

Biology: Only the asexual generation of Kokkocynips panamensis is known. The galls are found between October and November, during the rainy season. The adult insects emerge from mature galls in November.