Oxyscelio striarum Burks

Burks, Roger A., Masner, Lubomir, Johnson, Norman F. & Austin, Andrew D., 2013, Systematics of the parasitic wasp genus Oxyscelio Kieffer (Hymenoptera, Platygastridae s. l.), Part I: Indo-Malayan and Palearctic fauna, ZooKeys 292, pp. 1-263 : 214-216

Oxyscelio striarum Burks sp. n. Figures 410-413Morphbank108

Description.

Female. Body length 4.8-5.45 mm (n=12).

Radicle color: same color as scape. Scape color: Yellowish. A4: longer than broad. A5: longer than broad. Antennal club: formed, segments compact.

Interantennal process: not elongate. Median longitudinal elevation in frontal depression: absent. Frontal depression: concave. Frontal depression sculpture: with 3-5 complete transverse carinae. Submedian carina: weak, shallow and rounded or formed by ledge. Submedian carina medially: without peak. Concavity across dorsal part of frontal depression: absent. Depression extending ventrally from median ocellus: absent. Upper frons: not hood-like. Malar area near antennal foramen: without carina or expansion. Malar area at mouth corner: without striae. Smooth strip along posterior side of malar sulcus: present, broad throughout its length. Middle genal carina: present. Direction of middle genal carina dorsally: parallel to eye margin. Major sculpture of gena anteriorly: umbilicate-foveate. Major sculpture of gena posteriorly: umbilicate-foveate; rugose. Microsculpture of gena anteroventrally: absent. Microsculpture of gena posteroventrally: absent. Median carina extending posteriorly from hyperoccipital carina: absent. Hyperoccipital carina: indicated by rugae. Lateral connection between hyperoccipital and occipital carinae: present as a weak elevation. Area between vertex and occipital carina: umbilicate-foveate. Occipital carina medially: absent. Lateral corners of occipital carina: sharp and protruding.

Lateral pronotal area: without bulge projecting towards anterior pit. Epomial corner: strong. Netrion surface anteriorly: not inflexed. Mesoscutum anteriorly: not steep. Mesoscutal median carina: present and complete. Longitudinal carina between median carina and notauli: absent. Major sculpture of medial mesoscutum anteriorly: umbilicate-foveate. Major sculpture of medial mesoscutum posteriorly: umbilicate-foveate. Microsculpture of medial mesoscutum anteriorly: granulate. Microsculpture of medial mesoscutum posteriorly: absent. Major sculpture of mesoscutellum: umbilicate-fove ate; longitudinally rugose. Microsculpture of mesoscutellum medially: absent. Microsculpture of mesoscutellum laterally: absent. Mesoscutellar apex: convex or straight. Setae along anterior limit of femoral depression: arising from rows of foveae. Number of carinae crossing speculum above femoral depression: 2. Number of carinae crossing femoral depression: more than 5. Mesepimeral sulcus pits: more than 5. Metascutellum dorsally: flat. Metascutellar sculpture dorsally: with scattered rugae. Median carina of metascutellum: absent or branched. Metascutellar setae: absent. Metascutellar apex: convex or straight. Metapleuron above ventral metapleural area: crossed by carinae. Metasomal depression setae: absent. Lateral propodeal carinae anteromedially: strongly diverging. Anterior areoles of metasomal depression: absent. Anterior longitudinal carinae in metasomal depression: absent. Lateral propodeal areas: separated medially. Postmarginal vein: absent. Fore wing apex: reaching apex of T4; reaching middle of T5.

T1 midlobe: obscured by other raised sculpture. T1: with long anterior bulge, reaching metascutellum. T2: with strong set of curved striae. T6: longer than broad. Apical flange of T6: not exposed apically. Metasomal apex: rounded. Major sculpture of T6: umbilicate-punctate; longitudinally striate or rugose. Microsculpture of T6: granulate.

Male. Unknown.

Diagnosis.

Female: Mesoscutellum without granulate areas. Metascutellum broad, rugose. T1 with a moderately developed anterior horn that causes the longitudinal carinae to become broad and indistinct anteriorly. T2 and T3 with long, approximated curved striate that for much of their length are not separated by setal pits. Fore wings long enough to reach apex of T4 or middle of T5.

Etymology.

Latin noun, genitive case, meaning “furrows.” Refers to the distinctive striae on T2 and T3.

Link to distribution map.

[http://hol.osu.edu/map-full.html?id=275511]

Material examined.

Holotype, female: INDONESIA: Kalimantan Barat Prov., Cabang Panti Research Station, 1° rainforest / alluvial closed canopy, IIS 910126, Gunung Palung National Park, 01°15'S, 110°05'E, 100-400m, 15.VI-15.VIII.1991, malaise trap/pan trap, Darling, Rosichon & Sutrisno, OSUC 368958 (deposited in MBBJ). Paratypes: (13 females) BRUNEI: 1 female, OSUC 376637 (BMNH). INDONESIA: 4 females, OSUC 368946 (CNCI); OSUC 257067 (MBBJ); OSUC 257085, 257089 (ROME). MALAYSIA: 6 females, OSUC 376608-376609 (BMNH); OSUC 369029, 369058, 369062 (CNCI); OSUC 453788 (OSUC). THAILAND: 2 females, OSUC 368765 (CNCI); UCRC ENT 135267 (UCRC).

Comments.

Oxyscelio striarum varies in metasomal length, with some specimens having a long and nearly parallel-sided T5 but with others having a much shorter and broader metasomal apex. There is a continuum between these two extremes, throughout the distribution of this species, such that they could not be satisfactorily separated into distinct species.