Neuroterus fusifex Pujade-Villar, In Pujade-Villar et al. (2016b: 77)

Gall (Figs. 6h-i): Multilocular gall, located in catkins, ovoid (7-12 mm long and 5-7 mm wide) or at the petiole and base of the leaves (new location). In catkins, it causes hypertrophy of the axis; the anthers of some flowers protrude. When young, it is green and turgid, hardening and turning purple-red upon maturing. The surface is provided with a thin, dense whitish pubescence. Inside are numerous rounded larval chambers (0.5 mm in diameter) arranged together, bound with a hard consistency. The medullary space between the larval chambers hardly exists.

Hosts: Quercus laeta and Q. rugosa (section Quercus).

Biology: Species is known only from the sexual generation. Galls appear in April when catkins and leaves begin to develop. Adults emerge at the end of April or beginning of May. Most of the galls fall to the ground shortly after, although some can remain on the tree for a few more months.

Distribution: Mexico (State of Mexico); first record for Santa Fe (Mexico City) on Q. laeta.

- Uriel Barrera-Ruiz, Victor Cuesta-Porta, David Cibrian-Tovar, Aitor Martinez-Romero, Juli Pujade-Villar: (2021) Avispas agalladoras de los encinos de Santa Fe (Ciudad de México, México) (Hymenoptera, Cynipidae: Cynipini; Fagaceae)^©