Andricus guanajuatensis (agamic)

Andricus santafe (agamic)

Andricus guanajuatensis Pujade-Villar n. sp.

Gall (Fig. 14f). Galls are chestnut red, large regular, woody enlargements partially surrounding small twigs and composed by small, distinct, thoroughly fused globular masses surrounding twigs. Polythalamous, 2.0–6.0 x 1.0–5.0 cm, with hard tissue. The grey to woody coloured gall surface is delicately rough and wrinkled; the net-like anastomose are similar coloured than the depressed areas and often weakly cracked. This structure is visible under stereomicroscope magnification. The larval chambers (3.0 x 4.5 mm) are separately situated inside the gall, not very numerous. Walls of chambers are yellowish, big and very hard (2-3 mm thick). Galls remain on oak branches several years and turn darker over time.

Host.Quercus castanea Née and Q. obtusata Humb. & Bonpl. (section Quercus).

Distribution. Guanajuato and Michoacán (Mexico).

Biology. Only the asexual generation is known. Adults emerge in September and May. Gall tissues are very hard. 

Etymology. Related to the State where these galls were collected.

Andricus santafe Pujade-Villar n. sp.

Gall (Fig. 15a). Galls are chestnut black, large irregular, woody enlargements partially surrounding small twigs and composed of small, distinct, thoroughly fused globular masses. Polythalamous, 2.0–7.0 x 1.0–5.0 cm, with very hard tissue. The grey to woody coloured gall surface is delicately smooth. The larval chambers (3.0 x 4.5 mm) are scattered throughout the gall tissue, few chambers per gall (2-25, depending of the size of the gall); walls of chambers are yellowish, hard, and distributed irregularly inside. Galls remain on oak branches one to two several years and turn darker over time. When young the galls are olive green. The gall development start in June and becomes mature until February to March of the next year. 

Host.Quercuslaeta Liebm. (section Quercus).

Distribution. Mexico (Santa Fe, Delegación Cuajimalpa, D. F., Mexico City).

Biology. Only the asexual generation is known. Adults emerge in winter to early spring (February to April). Gall tissues are very hard. 

Etymology. Named after the Mexican collecting place.

Review of Andricus species (Hymenoptera, Cynipidae) producing woody tuberous oak galls in México and bordering areas of United States of America