Orasema delicatula Walker
Creators: name: Burks, Roger A.
name: Mottern, Jason
name: Heraty, John M.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Eucharitidae
Orasema
Orasema delicatula

description: Orasema delicatula (Walker)
urn:lsid:zoobank.org:act:7773C1D5-446C-4FB2-96A1-2CF0983EA3D0 (Figs 11–17)
Eucharis delicatula Walker, 1862: 377.
Stilbula delicatula; combination by Walker, 1871: 66.
Orasema delicatula; combination by Bouček, 1988: 520; Heraty, 1994: 54 (discussion of distribution); Heraty 2002: 51 (taxonomy).
Diagnosis. Face flattened and smooth, with very short setae, and with a strongly impressed longitudinal groove between torulus and eye. Petiole strongly expanded laterally near midlength, dorsally smooth or nearly so, and with a single dorsal longitudinal carina (Fig. 14: dpc).
Similar to O. erwini, but differs by the median petiolar carina and the prominent lateral expansions of the petiole (Fig. 14).
Female. Length, 4.5–4.7 mm. Head and mesosoma metallic bluish green to purple; pedicel and anellus pale brown, flagellum dark brown; coxae yellow, metatrochanters black medially; petiole metallic purplish black; gaster dark brown dorsally with purplish luster, ventrally pale brown, except anterior region of Ms2 black with metallic luster and some areas near ovipositor dark brown.
Head subtriangular (Fig. 11), 1.5× as long as broad. Face flat with broad depression enclosing longitudinal groove between torulus and eye; scrobal depression with a broad flat median carina bordered laterally by broad foveate furrow. Eye bare. Labrum with 8–10 digits. Palpal formula 3-2. Pedicel as broad as F2; flagellum length 2× height of head; F2 2.5× as long as broad, F2 1.2× as long as F3.
Mesosoma. Mesoscutum with variable sculpture ranging from rugulose-areolate, approaching reticulate (Fig. 13) to transversely carinate, lateral lobe with finely sculptured medial depression; dorsally with minute setae. Axilla with oblique carinae or with very weak sculpture; mesoscutellar disc areolate-rugose with ovate depression just anterior to frenal line, as long as broad, broadly separated from transscutal articulation at base by deep fovea; frenum areolate-rugose. Propodeal disc areolate-rugose with irregular median carina; callus nearly smooth, with a few minute setae. Metafemur sparsely setose ventroapically. Fore wing 2.7–3.3× as long as broad; stigmal vein 1.5–2.0× as long as broad, slightly angled to anterior margin.
Metasoma with petiole 1.5–1.6× as long as metacoxa, 2.1–2.4× as long as broad, laterally expanded near midlength, smooth or nearly so, with strong dorsal longitudinal carina (Fig. 14). Hypopygium with few minute setae apically. Ovipositor (Figs 15, 16) curved cephalad, ventral (1st) valvula (Fig. 16: vv) with subapical lateral line of 6–8 narrowly spaced blunt teeth (Figs 15, 16: tvv); dorsal (2nd) valvula (Fig. 16: dv) with 8–11 annuli that are carina-like and meet along midline (Figs 15, 16: adv).
Male. Length, 3.5 mm. Similar to female except for following character states: face reddish; metasoma with petiole 1.9× as long as metacoxa, 3.27× as long as broad. Parameres long and narrow, digitus with 6 broadly spaced teeth.
Planidium first instar larva (USNM: UCRCENT00412681, Fig. 17). Length 0.17 mm. Antenna absent. Labial plates absent. Tergopleural line absent. Tergites I and II (TI, TII) separate. TI, TII, TIII with dorsal seta and with wrinkle-like longitudinal sculpture dorsally. TII, TVI with very short lateral seta. TI, TIII, TV, TVII with ventral seta. TIX with separated leaflike ventral plate having a uniformly curved posterior margin. Caudal pad present; caudal cerci present and relatively long, about as long as apical 4 tergites.
Found on metacoxa of adult female from Panama: El Valle. Planidia can be found on adults that may have visited oviposition sites frequented by other females. While common in some groups of Eucharitinae, this is the first case recorded for a member of the Oraseminae. The planidium very closely matches with Orasema planidia (Heraty 1994, 2000), and we feel confident of the association.
Type material Examined. Lectotype. “Lecto-type, Type, Psilogaster delicatula Walker, B.M. Type HYM. 5.612, Orasema delicatula (Walk.) det. Z. Bouček, 1978” [♀, BMNH: UCRCENT00310030]. Note: The specimen locality was reported as “ Australia (?)” by Walker (1862) but this is certainly incorrect, and this specimen must have been collected from South America or Panama (Heraty 1992).
Additional material examined. Brazil: Mato Grosso: [no locality] 7.iii.1968, O.W. Richards, R.S. & R.G.S. Exped., gallery forest [1♀, BMNH: UCRCENT00239436]. Pará: Santarem, 30m, 2°26'22"S, 54°41'55"W, H.H. Smith [1♀, USNM: UCRCENT00161421]. Rondônia: Faz. Rancho Grande, 62 km S Ariquemes, 10°17'57"S, 62°52'12"W, 12–22.xi.1991, E. Fischer [1♀, UCRC: UCRCENT00408490]. Ecuador: Napo: Napo & Coca rivers, 0°23'46"S, 78°03'00"W, 2–10.v.1965, L. Peña [1♀, AEIC: UCRCENT00251354]; Limoncocha, on Rio Napo, 0°24'42"S, 76°37'31"W, 26.vii.1974, B.A. Drummond, malaise trap [2♀, FSCA: UCRCENT00322523, FSCA: UCRCENT00322524]; Limoncocha, 250m, 0°24'41"S, 76°37'31"W, 15–28.vi.1976, S. & J. Peck [1♂ 4♀, CNC: UCRCENT00320759— CNC: UCRCENT00320763]; 10 km NE Tena, Bio Hollin, 400m, 0°58'28"S, 77°43'38"W, 19.ii.1983, L. Masner [1♀, CNC: UCRCENT00415262]. Zamora-Chinchipe: Zamora, Rio Jumboé, 4°07'29"S, 78°56'23"W, 1.iv.1965, L. Peña [1♀, AEIC: UCRCENT00251355]. French Guiana: Montagne des chevaux, 4°43'22"N, 52°24'44"W, 4.x.2011, SEAG [2♀, UCRC: UCRCENT00412210, UCRC: UCRCENT00412211]. Guyana: Kartabo, Bartica Dist., 8m, 6°24'00"N, 58°37'00"W, 29.iii.1924 [1♀, AMNH: UCRCENT00238126]. Panama: El Valle, 8°34'48"N, 80°10'12"W, xi.1946, N.L.H. Krauss [3♀, USNM: UCRCENT00247752— USNM: UCRCENT00247754]. Peru: Huánuco: Monson Valley, Tingo Maria, 620m, 9°17'43"S, 75°59'51"W, 20.i.1927, A. Garcia & C. Porter [1♀, MCZ: UCRCENT00318635]; Monson Valley, Tingo Maria, 750m, 9°17'59"S, 75°59'05"W, 18.ix.1954, E.I. Schlinger & E.S. Ross [1♀, CASC: UCRCENT00417472]. Cusco: Quince Mil, 750m, 13°13'00"S, 70°44'00"W, 16.x.1962, Pena [1♀, MCZ: UCRCENT00318634]. Quince Mil, 750m, 13°13'03"S, 70°44'27"W, 15–30.x.1962, L. Peña [1♂, CNC: UCRCENT00320765]. Quince Mil, nr Marcapata, 750m, 13°13'03"S, 70°44'27"W, 20–30.x.1962, L. Peña [2♀, AEIC: UCRCENT00251356–57]. Venezuela: Táchira: Pregonero, Camp. Siberia, Hospital, 1280m, 8°00'56"N, 71°45'48"W, 10–31.vii.1989, S. & J. Peck [1♀, UCRC: UCRCENT00434757].
description: Published as part of Burks, Roger A., Mottern, Jason & Heraty, John M., 2015, Revision of the Orasema festiva species group (Hymenoptera: Chalcidoidea: Eucharitidae), pp. 521-534 in Zootaxa 3972 (4) on pages 526-529, DOI: 10.11646/zootaxa.3972.4.4, http://zenodo.org/record/239969