Orasema masonicki,

Baker, Austin J. & Heraty, John M., 2020, The New World ant parasitoid genus Orasema (Hymenoptera: Eucharitidae), Zootaxa 4888 (1), pp. 1-84: 68-70

publication ID


publication LSID




persistent identifier


treatment provided by


scientific name

Orasema masonicki

n. sp.

Orasema masonicki  n. sp.


( Fig. 37View FIGURE 37)

Diagnosis. Distinguished from O. heacoxi  by features provided in the key.

Description. Female. Length 1.9–2.2 mm ( Fig. 37AView FIGURE 37). Color. Scape brown. Mandible brown. Femora brown with strong iridescence. Gaster dark brown with strong blue-green iridescence. Head ( Fig. 37BView FIGURE 37). Head in frontal

view elongate; HW:HH = 0.7–1.0; longitudinal groove between eye and torulus absent; IOD:EH = 1.0–1.1; MS:EH = 0.3–0.6; malar depression weakly impressed adjacent to mouth; epistomal sulcus distinct and sharply defined. Occiput deeply emarginate in dorsal view. Pedicel small and globose. FL:HH = 0.6–0.9; F2L:F2W = 1.0–1.5, F2L:F3L = 1.0 ( Fig. 37DView FIGURE 37). Mesosoma ( Fig. 37C, F, GView FIGURE 37). ML:MH = 1.4–1.6. Mesoscutal midlobe reticulate. Scutoscutellar sulcus broad, narrowly separated from transscutal articulation; frenum reticulate; axillula reticulate. Mesepisternum reticulate laterally, weakly reticulate ventrally. Upper mesepimeron weakly reticulate; lower mesepimeron reticulate; transepimeral sulcus weakly impressed. Metepisternum laterally reticulate. HCL:HCW = 1.2–1.8, reticulate; HFL:HFW = 4.6–6.3. FWL:FWW = 2.2–3.9, FWL:ML = 1.9–2.4. Metasoma. PTL:PTW = 2.5–3.4, PTL:HCL = 1.1–1.7, lateral margin rounded, ventral sulcus present with margins narrowly separated. Apical setae of hypopygium with several setae on each side of midline.

Male. Length 2–2.1 mm. HW:HH = 0.9–1.1. Scape brown; FL:HH = 0.9–1.2; F2L:F2W = 0.8–1.4 ( Fig. 37EView FIGURE 37). Tibiae yellow. PTL:PTW = 5.5–7.5, PTL:HCL = 2.2–3.3.

Hosts. Unknown.

Plant associates. Unknown.

Distribution ( Fig. 35View FIGURE 35). Costa Rica: AL, GU, HE. Collected January–May.

Material examined. Holotype. COSTA RICA. Guanacaste: Est. Pitilla, 9 km S Santa Cecilia , P.N. Guanacaste, 700m, 10°59’28”N, 85°25’39”W, iii.1995, P. Rios, #4359 [♀, deposited in INBIO: INBIOCRI02242095].GoogleMaps 

Paratypes. COSTA RICA. Alajuela: Sect. San Ramon de Dos Rios , 620m, 10°52’54”N, 85°24’41”W, 16.i- 3.ii.1995, F.A. Quesada, #4400 [1³, INBIO: INBIOCRI02192938]; 20.ii-5.iii.1995, #4401 [4³ 1?, INBIO: IN-BIOCRI02138790, INBIOCRI02138802, INBIOCRI02138811, INBIOCRI02138832, INBIOCRI02138835]; C. Cano, #4396 [15³ 4♀, INBIO: INBIOCRI02133093, INBIOCRI02133101–02, INBIOCRI02133144, INBIOC- RI02133155–56, INBIOCRI02133159, INBIOCRI02133164–66, INBIOCRI02133183, INBIOCRI02133195, IN-BIOCRI02133204, INBIOCRI02133209, INBIOCRI02133213–15, INBIOCRI02133225, INBIOCRI02133227]; 20.ii-3.iii.1995, #4398 [10³ 8♀, INBIO: INBIOCRI02174676–77, INBIOCRI02174679–80, INBIOCRI02174682, INBIOCRI02174686–87, INBIOCRI02174691, INBIOCRI02174714, INBIOCRI02174730, INBIOCRI02174755, INBIOCRI02174760, INBIOCRI02174776, INBIOCRI02174783, INBIOCRI02174787–88, INBIOCRI02174793, INBIOCRI02174800]; 11-15.iv.1994, C. Moraga, #2840 [1³, INBIO: INBIOCRI01780190]; 13-28.iii.1994, K. Tay-lor, #2763[4³ 1♀, INBIO:INBIOCRI01712287, INBIOCRI01712554, INBIOCRI01712730, INBIOCRI01712733, INBIOCRI01760375]GoogleMaps  . Guanacaste: Est. Pitilla, 9 km S Santa Cecilia, P.N. Guanacaste, 700m, 10°59’28”N, 85°25’39”W, 2-19.iii.1992, P. RiosGoogleMaps  [1♀, INBIO: INBIOCRI00420518]. Sector Las Pailas , 800m, 10°46’31”N, 85°20’59”W, 12.iv-3.v.1995, K. Taylor, #4810GoogleMaps  [2³ 1♀, INBIO: INBIOCRI02425608, INBIOCRI02425621, IN-BIOCRI02425633]; 16-30.iii.1995, #4811GoogleMaps  [8³, INBIO: INBIOCRI02403459, INBIOCRI02403595, INBIOC-RI02403602–03, INBIOCRI02403778, INBIOCRI02403840, INBIOCRI02403851, INBIOCRI02403878]GoogleMaps  . Heredia: Send. Terciopelo, Est. Magsaysay, P.N. Braulio Carrillo, 220m, 10°24’2”N, 84°02’53”W, 1991, malaise trap [1³, INBIO: INBIOCRI01194079]GoogleMaps  .

Etymology. Named in honor of Paul Masonick, an entomologist who has helped to collect specimens of Orasema  , including those of the heacoxi  group.

Unplaced Orasema  species

( Figs 38–44View FIGURE 38View FIGURE 39View FIGURE 40View FIGURE 41View FIGURE 42View FIGURE 43View FIGURE 44)

Discussion. Several species could not be confidently placed to species group, especially those lacking molecular phylogenetic data. Placing these taxa into species groups described herein would make the species group key more difficult to use, so we prefer to treat them as unplaced until more data can be collected.