Plagiotrochus amenti Kieffer, 1901

Pujade-Villar, Juli, Villemant, Claire & Andreï-Ruiz, Marie-Cécile, 2000, Cynipidae associated with Quercus collected in Corsica with the description of a new Plagiotrochus species (Hymenoptera, Cynipoidea), Zoosystema 22 (4), pp. 835-846 : 840

Plagiotrochus amenti Kieffer, 1901

Plagiotrochus amenti Kieffer, 1901: 447 . — Dalla Torre & Kieffer 1910: 390.

Plagiotrochus amenti Tavares, 1902: 17 & 18 [New homonymy and synonym].

Plagiotrochus amenti Tavares, 1902 . — Kieffer, 1902: 586-587. — Tavares 1922: 117; 1926: 76-78. — Nieves-Aldrey 1982: 67. — Pujade-Villar 1998: 118.

Plagiotrochus amenti – Tavares 1926 in Nieves-Aldrey 1985: 106-108. — Nieves-Aldrey 1989: 142; 1995: 119 [Mistake in the description’s year].

MATERIAL EXAMINED. — Corse Bastilicaccia. Malaise trap, 31.V-7.VI.1996 (R2/MH), 1 ♀ (deposited in UB); ( R2 /MS) , 4 ♀ ♀; 7-14.VI.1996 (R3/MS), 2 ♀ ♀ (1 ♀ deposited in EME, K. Shick col.) ; 14-21.VI.1996 (R4/MS), 2 ♁ ♁ & 3 ♀ ♀ (1 ♁ deposited in UB; 1 ♁ deposited in EME, K. Shick col.) .

Vallée du Fango. Yellow pan trap, 21-28.V.1993 (R4/DA/S1), 1 ♁; 4-12.VI.1994 (CS11/R1/94), 1 ♀ (deposited in UB) .

Suaralta. Q. suber galls (No. 9), 29.V.1995, 1 ♀.

The rest of the material deposited in MNHN.

REMARKS

The galls of this species on Q. suber catkins were described by Kieffer (1901), probably after Tavares’ personal communication because it was named “ Plagiotrochus amenti Tav. ”. According to the Nomenclatural Code, the author of this species is Kieffer because in his work no mention of Tavares was indicated. Posteriorly, Tavares (1902) described this species (adults and galls) and he finished the “As Zoocecidias Portuguesas” study. Then, Plagiotrochus amenti Tavares was homonymic and synonymic with Plagiotrochus amenti Kieffer. Later, Tavares published redescriptions of the gall and the adults, and from here inexplicable changes in the year of description of this species ocured.

This European species has a circummediterranean distribution. It was collected in Spain, Italy, Portugal and Switzerland (Tavares 1902; Bailey & Stange 1966; Nieves-Aldrey 1985).

The gall is undifferentiated on annual branches or is visible on catkins of Q. suber . The branch galls and the morphological characters of the sexual form are very similar to those of the asexual P. suberi leading us to suppose, like Nieves-Aldrey (1985), that these forms belong to the same species (Pujade-Villar & Ros-Farré 1998), even though no experimentation has yet demonstrated it.