Oxyscelio fossularum 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 : 120-122

Oxyscelio fossularum Burks sp. n. Figures 220-224Morphbank68

Description.

Female. Body length 4.55-4.75 mm (n=15).

Radicle color: same color as scape. Scape color: Yellowish. A4: longer than broad. A5: broader than long; as long as 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: strong, formed by a sharp raised carina. 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; irregularly rugose. Occipital carina medially: sinuate, concave medial to corners, but without a median peak. Lateral corners of occipital carina: sharp and protruding.

Lateral pronotal area: without bulge projecting towards anterior pit. Epomial corner: weak. 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-punctate. Microsculpture of medial mesoscutum anteriorly: granulate. Microsculpture of medial mesoscutum posteriorly: granulate. Major sculpture of mesoscutellum: umbilicate-foveate. Microsculpture of mesoscutellum medially: granulate. Microsculpture of mesoscutellum laterally: granulate. 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: 3-5. Mesepimeral sulcus pits: more than 5. Metascutellum dorsally: concave. Metascutellar sculpture dorsally: with scattered rugae. Median carina of metascutellum: absent or branched. Metascutellar setae: absent. Metascutellar apex: convex or straight; weakly emarginate. Metapleuron above ventral metapleural area: crossed by carinae; smooth. 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: present. Fore wing apex: reaching apex of T5.

T1 midlobe: with 6 or more longitudinal carinae; obscured by other raised sculpture. T1: with small rounded anterior bulge, not reaching metascutellum. T2: with long sublateral depressions. T6: longer than broad; as long as broad. Apical flange of T6: not exposed apically. Metasomal apex: rounded. Major sculpture of T6: umbilicate-punctate. Microsculpture of T6: granulate.

Male. Body length 4.35 mm (n=1). A5 tyloid: carina-like, not expanded. A11: longer than broad; as long as broad. Median tooth of frontal depression: absent. Median lobe of T1: with 5 longitudinal carinae. Metasomal apex: with rounded but projecting lobe-like corners.

Diagnosis.

Both sexes: Frontal depression crossed by a few carinae. Mesoscutellum strongly granulate. Metascutellum subrectangular, rugose. T2 with long sublateral depressions bordered medially by strong carinae. Female: T1 with a weakly developed anterior horn that has distinct longitudinal carinae. Fore wings long enough to reach middle of T5. T6 apically narrow but not sharply acuminate. Male: A11 longer than broad. T1 midlobe with 5 longitudinal carinae. T7 with rounded, protruding posterolateral corners.

Etymology.

Latin noun, genitive case, meaning "little trenches." Refers to the sublateral metasomal depressions.

Link to distribution map.

[http://hol.osu.edu/map-full.html?id=275507]

Material examined.

Holotype, female: INDONESIA: Aceh Auto. Prov., Sumatra Isl., Ketambe Research Station, 1° rainforest / young forest / terrace 3 closed canopy, IIS 900011, Gunung Leuser National Park, 03°41'N, 97°39'E, 350m, II-1990, malaise trap, C. Darling, OSUC 247975 (deposited in MBBJ). Paratypes: INDONESIA: 15 females, 1 male, OSUC 464008 (CNCI); OSUC 247853, 257427, 361719 (MBBJ); OSUC 247977-247978, 267545-267546 (OSUC); OSUC 228712, 247857-247858, 247974, 257035, 257037, 257056, 257430 (ROME).

Comments.

Oxyscelio fossularum is the only member of its species group known from Sumatra.