Diadegma tenuipes (Thomson, 1887)

Scaramozzino, Pier Luigi, Giovanni, Filippo Di, Loni, Augusto, Ricciardi, Renato & Lucchi, Andrea, 2018, Updated list of the insect parasitoids (Insecta, Hymenoptera) associated with Lobesiabotrana (Denis & Schiffermueller, 1775) (Lepidoptera, Tortricidae) in Italy. 2. Hymenoptera, Ichneumonidae, Anomaloninae and Campopleginae, ZooKeys 772, pp. 47-95 : 47

Diadegma tenuipes (Thomson, 1887)

Angitia tenuipes : Catoni 1910: 17, 1914: 250; Schwangart 1913: 6; Boselli 1928: 189; Stellwaag 1928: 664; Thompson 1946: 483.

Italian distribution of reared parasitoids.

Trentino-South Tyrol: Catoni 1910, 1914; Schwangart 1913.

Distribution.

A Palaearctic species ranging from Europe up to Mongolia; in Europe it is widely present with the exception of the Iberian Peninsula, Balkans and Greece. In North Africa it is reported only from Tunisia ( Yu et al. 2012; Zwakhals and van Achterberg 2017).

Host range.

Diadegma tenuipes is a solitary koinobiont larval endoparasitoid of a dozen of hosts, which belong to the Lepidoptera families Coleophoridae , Momphidae , Pieridae , Plutellidae , Psychidae , Tortricidae and to the Hymenoptera families Tenthredinidae and Braconidae ( Yu et al. 2012). Among these, some hosts of economic importance are indicated as the diamondback moth, the Oriental fruit moth ( G. molesta ), the European grape berry moth ( E. ambiguella ) and EGVM.

Ecological role.

The only Italian records of D. tenuipes on EGVM are those of Catoni (1910 and 1914). In the vineyards of southern Romania, Bărbuceanu and Jenser (2009) found this species, along with three other species of the same genus, attacking the overwintering generation of EGVM, with a rather low parasitization rates (0.8%). In Romania it is reported by Petcu (1978) living on E. ambiguella as well.

Taxonomic notes.

Like the previous species, D. tenuipes has been assigned by Horstmann (1969) to the subgenus Nythobia . It measures approx. 6 mm in length, with the head posteriorly narrowed, propodeum with evident costulae (anterior transverse carinae), and the area superomedia shorter than twice its width; areolet of the fore wing rather large and intercepted by the second recurrent vein (2m-cu) after the middle; mesopleuron with speculum almost smooth, very shiny, the area close to mesopleural suture finely dotted; the seventh metasomal tergite dorsally deeply notched, ovipositor sheath 0.8 times the length of the hind tibia and 1.4 times that of the first metasomal tergite; body black, wings with pterostigma light brown, fore coxae light, femora and tibiae reddish yellow, posterior tibiae dark behind the base and at the apex, sides of the third metasomal tergite stained with red ( Horstmann 1969).