Hydrelliaeucoila Díaz and Gallardo 2009

Reche, Vanina & Gallardo, Fabiana, 2022, Two new species of the Neotropical genus Hydrelliaeucoila (Cynipoidea: Figitidae: Eucoilinae), Journal of Natural History 56 (1 - 4), pp. 227-239 : 229-230

Hydrelliaeucoila Díaz and Gallardo 2009

Type species

Hydrelliaeucoila egeria Díaz and Gallardo, 2009

Diagnosis. This genus can be characterised by the following combination of features: Antenna of female filiform, without defined club, with last seven or eight flagellomeres with rhinaria. Mesosoma not much longer than high. Mesoscutum without notauli. Scutellar foveae sculptured at base. Dorsal surface of scutellum coarsely sculptured, can be reticulate-rugose, reticulate-areolate or areolate-rugose, never smooth or striated. Scutellar plate without glandular pit. Wings rounded apically, hairless towards the base of wing. Marginal cell of fore wing can be partially or completely open. Hairy ring at base of syntergum with a very short interruption dorsally.

Distribution. Argentina. Buenos Aires. Otamendi ( Díaz et al. 2009), La Plata (new record) and Ensenada (new record). Misiones. Yacutinga (new record). According to the biogeographical scheme of Arana et al. (2017), this distribution range falls within the the Neotropical region, Chacoan subregion, Pampean province for Buenos Aires, and Parana Forest province, for Misiones.

Biology. Hydrelliaeucoila egeria is a pupal parasitoid of the leaf miner Hydrellia egeriae Rodrigues-Júnior, Mathis and Hauser ( Diptera , Ephydridae ) ( Cabrera Walsh and Mattioli, 2007, 2008; Díaz et al. 2009, Cabrera Walsh et al. 2013, Rodrigues Júnior et al. 2015).

Key to species of Hydrelliaeucoila Díaz and Gallardo

1- Lateral and inferior area of face striated ( Figure 1b ). Pronotal plate slightly striated ( Figure 1d ). Marginal cell of fore wing partially open................................................................. ....................................................................................... Hydrelliaeucoila egeria Díaz and Gallardo

- Lateral and inferior area of face smooth. Pronotal plate smooth. Marginal cell of fore wing completely open ....................................................................................................................... 2

2- Head in frontal view with slightly dorso-ventral ridge adjacent to torulus ( Figure 2d , arrow). Scutellar plate with a dark impression on the entire edge ( Figure 2c , arrow).. .................................................................................................. Hydrelliaeucoila rufa Reche sp. nov.

- Head in frontal view without ridge adjacent to torulus ( Figure 3e , arrow). Scutellar plate without a dark impression on the entire edge ( Figure 3c ) ............................................ ...................................................................................... Hydrelliaeucoila nonstriata Reche sp. nov.

Figures

Figure 1. Hydrelliaeucoila egeria Díaz and Gallardo. A. Antenna of female. B. Head in frontal view. C. Antenna of female. D. Pronotal plate. E. Scutellum and propodeum. F. Mesosoma in lateral view. G. Base of metasoma. (Modified from Díaz et al. 2009.)

Figure 2. Hydrelliaeucoila rufa Reche sp. nov. A- Habitus; B- Head in frontal view; C- Mesosoma and scutellum in dorsal view, arrow indicates dark impression on the entire edge. D- Head in lateral view, arrow indicated slightly dorso-ventral ridge adjacent to torulus. E- Head and mesosoma in lateral view.

Figure 3. Hydrelliaeucoila nonstriata Reche sp. nov. A- Habitus. B- Head in frontal view. C- Scutellar plate in dorsal view. D- Head and mesosoma in lateral view. E- Head in frontal view, arrow indicates torulus smooth.