Pelecinobaccha summa

Miranda, Gil Felipe Gonçalves, 2017, Revision of the Hybobathus arx and Pelecinobaccha summa species groups (Diptera: Syrphidae), Zootaxa 4338 (1), pp. 1-43: 25-26

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Pelecinobaccha summa


The Pelecinobaccha summa  species group

Taxonomic notes. The female segment 6 in the P. summa  group has a weak line laterally, indicating an incomplete fusion of the two sclerites of the segment, different from the remaining Pelecinobaccha  species. It can be further distinguished from the remaining Pelecinobaccha  by the yellow lateral markings and the microtrichose pattern on the scutum, and the usually mostly pale metabasitarsomere ( Miranda et al. 2014).

Usually, the females of this group have a mostly dark frons, with narrow pale lateral margins. However, in females of P. cubensis  and P. alia  sp. nov. the dark area takes up only around 1/2 of the frons ( Fig. 8jView FIGURE 8), in a similar manner to females of the H. arx  group ( Fig. 5dView FIGURE 5), with the exception that in the latter the dark areas are clearly delimited while in those two species of the P. summa  group the margins of the dark areas are more diffuse and not clearly defined ( Fig. 8jView FIGURE 8). The abdominal segment 2 is usually longer in the males than on the females of this group. As per Miranda et al. (2014), but with a slight modification, the female sternite 7 of Pelecinobaccha  is referred to as the ‘segment 7 lateral sclerite’ to avoid wrong assumptions on homology. The epiproct apodeme is very short and can be distinguished as the triangular basal portion of the fused epiproct and cercus.

The species marked as Ocyptamus  SUR-21b in Reemer (2010) was very different from Relictanum johnsoni ( Curran, 1934)  and was thought to be a species from the P. summa  group. However, on a closer inspection of the specimen, some color patterns proved to be artefacts of preservation and it fits the description of P. cora ( Curran, 1941)  ( P. peruviana  species group).

Prey records. Based on Miranda et al. (2014, 2016), the most likely prey of this group is within the family Coccidae  ( Hemiptera  ) although no prey is known up to now.

Key to species. A picture key is also available at

1. Scutum mostly brown/black laterally ( Fig. 11cView FIGURE 11); if scutum mostly yellow laterally, then face mostly brown, yellow restricted to lateral sides ( Fig. 11iView FIGURE 11)..................................................................... P. summa (Fluke) 

- Scutum yellow laterally ( Fig. 10gView FIGURE 10); face usually yellow, at most with small brown area on tubercle ( Fig. 10hView FIGURE 10)............. 2

2. Face brown on tubercle ( Fig. 10hView FIGURE 10); frons and frontal triangle mostly black ( Fig. 10hView FIGURE 10); abdominal segment 4 longer than wide, central vittae not connected basally to other yellow markings ( Fig. 10eView FIGURE 10)............................ P. impostor  sp. nov.

- Face wholly yellow; frons yellow with narrow central dark vitta ( Fig. 8jView FIGURE 8), frontal triangle wholly yellow ( Fig. 9cView FIGURE 9); abdominal segment 4 wider than long, central vittae connected basally to baso-lateral yellow markings ( Fig. 8aView FIGURE 8)................... 3

3. Wing usually with apical dark area ( Fig. 9gView FIGURE 9); female abdominal segment 6 longer than basal width ( Fig. 9eView FIGURE 9); male genitalia elongated ( Figs 9h & iView FIGURE 9); mostly occurring in Central America........................ P. cubensis (Macquart)  comb. nov.

- Wing without apical dark area ( Fig. 8dView FIGURE 8); female abdominal segment 6 as long as or shorter than basal width ( Fig. 8iView FIGURE 8); male genitalia not elongated ( Figs 10j & lView FIGURE 10); mostly occurring in South America. ................................ P. alia  sp. nov.

Species of the Pelecinobaccha summa  group