Orasema tolteca,

Baker, Austin J. & Heraty, John M., 2020, The New World ant parasitoid genus Orasema (Hymenoptera: Eucharitidae), Zootaxa 4888 (1), pp. 1-84: 36-38

publication ID

https://doi.org/10.11646/zootaxa.4888.1.1

publication LSID

lsid:zoobank.org:pub:574A35A5-A551-4A7E-B2BC-481D703B1BE7

DOI

http://doi.org/10.5281/zenodo.4337829

persistent identifier

http://treatment.plazi.org/id/447187B9-FFBF-E562-AAD1-FA10AFA9FCC6

treatment provided by

Plazi

scientific name

Orasema tolteca
status

 

Orasema tolteca  species group

( Figs 17–20View FIGURE 17View FIGURE 18View FIGURE 19View FIGURE 20)

Established by Heraty (2000).

Diagnosis. Recognized by the following combination of characters: generally large body size (among the largest of all Orasema  ), anterior margin of fore wing costal cell with bare area ( Fig. 20HView FIGURE 20), head with face flat and with relatively small eyes ( Figs 18BView FIGURE 18, 20BView FIGURE 20), antenna with 8 funiculars in females ( Figs 18DView FIGURE 18, 20DView FIGURE 20) and 9 funiculars in males ( Figs 18EView FIGURE 18, 20EView FIGURE 20), mesoscutal midlobe not reticulate and sparsely setose ( Figs 18FView FIGURE 18, 20FView FIGURE 20), petiole cylindrical, postmarginal vein at most slightly longer than stigmal vein, and mesosoma relatively high, broad, and short longitudinally.

Description. Female. Length 2.8–5.2 mm. Color. Flagellum dark brown. Mandible, maxilla, and labium brown. Coxae iridescent green; tibiae yellow. Fore wing hyaline, venation pale brown. Petiole same as mesosoma.

Head. Head in frontal view subtriangular to broadly triangular; face reticulate often with elongate reticulations between the eye and scrobe; scrobal depression shallow, laterally rounded, with transverse striae; longitudinal groove between eye and torulus absent; eyes sparsely setose; malar depression weakly impressed between mouth and eye margin; supraclypeal area longer than broad, weakly reticulate; clypeus weakly reticulate; epistomal sulcus vaguely defined; anterior tentorial pit strongly impressed; anteclypeus distinct, straight. Mandibular formula 3:2; palpal formula 3:3. Occiput imbricate, shallowly emarginate in dorsal view, dorsal margin evenly rounded; temples present, rounded. Scape reaching median ocellus. Pedicle small and globose. Flagellum with 8 funiculars; anellus disc-shaped; funiculars subequal in length distally, successively shorter; clava subovate. Mesosoma. Mesoscutal midlobe rugose-areolate to rugose reticulate, sparsely setose; lateral lobe costate dorsally, rugose laterally; notauli shallow. Axilla dorsally rounded, on roughly same plane as mesoscutellum; scutoscutellar sulcus broad, irregularly foveate, narrowly separated from transscutal articulation; mesoscutellar disc as long as broad, rugose; frenal line foveate; frenum areolate. Propodeal disc flat, without depression or carina; callus with a few small setae. Propleuron convex, strigate. Prepectus triangular dorsally, strongly narrowed ventrally. Mesepisternum reticulate laterally, areolate-reticulate anteriorly, broadly rounded anterior to mid coxa; postpectal carina prominent. Lower mesepimeron rugose-reticulate; transepimeral sulcus distinct. Metepisternum laterally rugose-reticulate. Hind coxa reticulate laterally, smooth ventrally; hind femur evenly covered with setae; hind tibia densely setose. Fore wing with basal area and speculum bare, costal cell mostly setose but with bare area near margin, wing disc densely setose; marginal fringe minute; submarginal vein with several long setae; marginal vein setose; stigma vein about as long as broad, slightly angled toward wing apex; postmarginal vein as long as stigma vein or slightly longer. Hind wing costal cell with broad, bare area. Metasoma. Petiole cylindrical, linear in profile, anterior carina strong, lateral margin with longitudinal carina continuous with basal flange. Antecostal sulcus foveate; acrosternite posteriorly rounded; apical setae of hypopygium with one pair of setae much longer than the others. Ovipositor with subapical carina present; first (ventral) valvula with 10 or 11 small, closely-spaced teeth.

Male. Length 3.5–4.6 mm. Scape dark brown with green iridescence; flagellum with 9 funiculars; anellus discshaped. Tibiae yellow.

Phylogenetics. Both species of this group, O. tolteca  and O. castilloae  , are represented in the analyses from Baker et al. (2020), which were referred to as “ Orasema  _tolteca_ MEX _D4718” and “ Orasema  _nr_tolteca_ USA: AZ_AE_D41 33”, respectively. These two species are sister groups in all analyses with AHE sequence data and were treated as part of the cockerelli  species group despite O. tolteca  being treated as its own group by Heraty (2000). In molecular analyses they rendered the remaining cockerelli  group species paraphyletic by being more closely related to Nearctic cockerelli  group than the Neotropical cockerelli  group. We treat the tolteca  group independently here, but to maintain a cladistic classification, we recognize and revise the heacoxi  group and recognize the Neotropical vianai  group for future revisionary work. The split between O. tolteca  and O. castilloae  is estimated to have occurred 5–15 MYA.

Key to species of the Orasema tolteca  species group

1) Labrum with 4–6 digits; hind femur with dark iridescent patch from base along at least 3/4 of length ( Fig. 20AView FIGURE 20); male FL:HH = 2.1–2.6 (central to southern Mexico)................................................... Orasema tolteca Mann 

- Labrum always with 4 digits ( Fig. 18BView FIGURE 18); hind femur light-colored near base and with dark iridescent patch along 2/3 length ( Fig. 18AView FIGURE 18); male FL:HH = 1.8–2.0 ( Mexico: SO; United States: AZ)......................... Orasema castilloae  n. sp.