Orasema festiva

Burks, Roger A., Mottern, Jason & Heraty, John M., 2015, Revision of the Orasema festiva species group (Hymenoptera: Chalcidoidea: Eucharitidae), Zootaxa 3972 (4), pp. 521-534 : 523

publication ID


publication LSID




persistent identifier


treatment provided by


scientific name

Orasema festiva


Orasema festiva   species group

Diagnosis. Recognized from all other Orasema   species by having 8 funiculars ( Fig. 2 View FIGURES 2 – 6 : F 2 –F 9), smooth face, labrum with 8–11 digits ( Fig. 3 View FIGURES 2 – 6 : lbr), densely setose, elongate fore wing with a long postmarginal vein reaching near to apex of wing ( Figs 2, 6 View FIGURES 2 – 6 : pmv), and lateral margins of petiole with a single strong carina confluent with a broadened ventral surface ( Fig. 5 View FIGURES 2 – 6 : lpc). Additional descriptive features include: scape and legs (beyond coxae) yellow; face smooth; vertex posteriorly sharp; mandibular formula 3: 2; wings slightly infuscate, at least 2.3 × as long as broad; fore wing with bare basal cell and small specular area; hind wing costal cell densely setose; mesoscutum and mesoscutellum with areolate-rugose or transverse sculpture, never reticulate; transverse antecostal sulcus on Ms 2 smooth ( Fig. 25 View FIGURES 22 – 25 : acs).

Biology. Unknown. Immature stages of O. caesariata   (egg) and O. delicatula   (first instar) are described herein. Distribution. Northern South America and Panama ( Fig. 1 View FIGURE 1 ), with a range in elevation from 150–1280 meters. Phylogenetics. Six species are recognized. As part of a separate study, we have sequences including 18 S (783 bp), 28 S D 2 –D 5 (1120 bp), COI (1041 bp) available for four species, O. caesariata   , O. delicatula   , O. reburra   and O. erwini   (Mottern & Heraty in prep). In those results (likelihood and parsimony using PAUP and RAxML), the festiva   -group is monophyletic, with two species pairs: O. caesariata   + O. reburra   and O. delicatula   + O. erwini   . These results are reinforced by morphological differences. Both O. caesariata   and O. reburra   have long setae on the head, mesosoma and petiole, which in Orasema   is otherwise known only in the Orasema   coloradensis- group. The longitudinal groove between the torulus and eye is shallow, hardly visible, and not surrounded by a depression in O. reburra   , and is absent from O. caesariata   , but is deeply impressed and surrounded by a depression in the other species. This feature does not occur in a similar form in any other Orasema   and would support the monophyly of O. alvarengai   , O. delicatula   , O. erwini   and O. festiva   . No other characters appear to delineate groupings within this complex.


University of Coimbra Botany Department


Punjab Agricultural University