Dilophus sp. 1

Pacheco Da Silva, Vitor C., Schelesky-Prado, Daniel De C., Fitzgerald, Scott J., Serra, Wilson Sebastián, Scarabino, Fabrizio, Costa, Andrés, Hagopián, Damián & Martínez, María, 2025, Bibionidae (Diptera: Bibionomorpha) from Uruguay: updated inventory including first reports of four species, Zootaxa 5588 (1), pp. 129-146 : 137

Dilophus sp. 1 ( Fig. 4D )

Material examined. Artigas: Sepulturas, Río Cuareim , 1♂, 11-i-1952, in the night under the light (FCE-Dip 1514) ;

Comments. This specimen does not fit into any known South American species and seems to represent a new species. It shares some features with D. segregatus (Hardy) and three other brazilian species that are probably closely related, D. plaumanni Edwards , D. dichrous Edwards and D. edwardsi (Hardy) . The Dilophus sp. 1 and the Brazilian species have a short rostrum and one spine on the upper set and four on the lower set (1:4). However, the thorax of D. sp. 1 is brown (maybe darker when the specimen was alive), not black as in D. segregatus and D. edwardsi or yellowish as in D. plaumanni and D. dichrous . The posterior margin of the epandrium of D. sp. 1 has a concave cleft, in D. segregatus the margin is straight, and the other species do not have the terminalia described in the literature. D. collaris also has one spine on the upper set, but has the rostrum elongated, however, only females are known, while only a single male is known for D. sp. 1. Therefore, it is preferred here not to associate the specimen with any described species and, possibly, to describe it as a new species in a subsequent work.

Figures

FIGURE 4. A Dilophus collaris Guérin-Méneville ♀*, B Dilophus pectoralis Wiedemann ♂, C Dilophus aff. tetracanthus Edwards ♀, D Dilophus sp. 1 ♂. Photo by Natural History Museum, Title 013933131_ lateral_ habitus, https://www.gbif. org/occurrence/3112968310. Scale bars: 1 mm.