Dixella andeana ( Lane, 1942 )

Corrêa, Caio Cezar Dias & Gil-Azevedo, Leonardo Henrique, 2024, Dixella woodi Chaverri & Borkent, 2007 (Diptera, Dixidae): Description of the female and a new record from Peru, Revista Brasileira de Entomologia (e 20240036) 68 (3), pp. 1-7 : 5

Dixella andeana ( Lane, 1942) ( Figs. 4A–D )

Diagnosis. Adults has wing vein R 2+3 bifurcation origin apical relative to M 1+2 bifurcation origin; vein R 2+3 origin very apical to crossvein r-m origin; thorax (lateral view) with two parallel brown stripes.

Type Material. ♂ HOLOTYPE (pinned, NHM#013444278 ): PERU, Loreto, Iquitos

Distribution. This species is recorded only from type locality: PERU, Loreto, Iquitos ( Fig. 7).

Remarks. Dixella andeana has the thorax with two parallel brown stripes, like D. peruviana and D. shannoni . They can be differentiated through wing venation: D. shannoni has the vein R 2+3 bifurcation origin relatively near to the M 1+2 bifurcation origin, while D. peruviana has the vein R 2+3 bifurcation origin basal relative to the M 1+2 bifurcation origin. Male terminalia also serve to distinguish these three species: D. peruviana has a thin and elongated gonostylus, while D. andeana has a short, wide, gonostylus strongly hirsute along outer margin; D. shannoni has apical lobe with two subbasal setae, while that of D. andeana has four apical setae ( Lane, 1942, 1953; Chaverri & Borkent, 2007; Huerta & Ibáñez-Bernal, 2021).

Despite Lane (1942) naming this species with the epithet ‘andeana’, the type locality is in the Amazon Rainforest ( Fig. 7), an area characterized by low altitude and dense forest vegetation contrasting significantly with the high-altitude and different flora of the Andean Mountain Range.

Figures

Figure 4 Dixella andeana (Lane, 1942), male (HOLOTYPE).A.Habitus (lateral view); B. Thorax (lateral view); C. Thorax (dorsal view); D. Labels (NHM photos).