Revision of the Hybobathus arx and Pelecinobaccha summa species groups (Diptera: Syrphidae)
Author
Miranda, Gil Felipe Gonçalves
text
Zootaxa
2017
2017-10-24
4338
1
1
43
journal article
31754
10.11646/zootaxa.4338.1.1
f0eefc2e-cf78-4041-ba3d-61601146871b
1175-5326
1035669
1C8B66EB-17CD-4971-86F2-F5E6F86A5AFF
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
), in a similar manner to females of the
H. arx
group (
Fig. 5d
), 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
). 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
); if scutum mostly yellow laterally, then face mostly brown, yellow restricted to lateral sides (
Fig.
11i
).....................................................................
P. summa
(Fluke)
- Scutum yellow laterally (
Fig.
10g
); face usually yellow, at most with small brown area on tubercle (
Fig. 10h
)............. 2
2. Face brown on tubercle (
Fig. 10h
); frons and frontal triangle mostly black (
Fig. 10h
); abdominal segment 4 longer than wide, central vittae not connected basally to other yellow markings (
Fig. 10e
)............................
P. impostor
sp. nov.
- Face wholly yellow; frons yellow with narrow central dark vitta (
Fig. 8j
), frontal triangle wholly yellow (
Fig. 9c
); abdominal segment 4 wider than long, central vittae connected basally to baso-lateral yellow markings (
Fig. 8a
)................... 3
3. Wing usually with apical dark area (
Fig.
9g
); female abdominal segment 6 longer than basal width (
Fig. 9e
); male genitalia elongated (
Figs 9h & i
); mostly occurring in Central America........................
P. cubensis
(Macquart)
comb. nov.
- Wing without apical dark area (
Fig. 8d
); female abdominal segment 6 as long as or shorter than basal width (
Fig.
8i
); male genitalia not elongated (
Figs 10j & l
); mostly occurring in
South America.
................................
P. alia
sp. nov.
Species of the
Pelecinobaccha summa
group