Orasema delicatula (Walker)

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 : 526-529

Orasema delicatula (Walker)

urn:lsid:zoobank.org:act: 7773 C 1 D 5-446 C- 4 FB 2-96 A 1-2 CF0983EA 3 D0 ( 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 Ms 2 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 F 2; flagellum length 2 × height of head; F 2 2.5 × as long as broad, F 2 1.2 × as long as F 3.

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 ( 1 st) valvula ( Fig. 16: vv) with subapical lateral line of 6–8 narrowly spaced blunt teeth ( Figs 15, 16: tvv); dorsal ( 2 nd) 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].