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

publication ID	https://doi.org/ 10.11646/zootaxa.4338.1.1
publication LSID	lsid:zoobank.org:pub:1C8B66EB-17CD-4971-86F2-F5E6F86A5AFF
DOI	https://doi.org/10.5281/zenodo.5671142
persistent identifier	https://treatment.plazi.org/id/4D7787D5-FFB2-4647-938E-FA0EF1C6FC8A
treatment provided by	Plazi
scientific name	Pelecinobaccha summa
status

Treatment

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. 8j View FIGURE 8 ), in a similar manner to females of the H. arx group ( Fig. 5d View 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. 8j View 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 http://keys.inpa.gov.br/?idkey=summagrp.

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

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

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

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

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

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

Species of the Pelecinobaccha summa group