Oxyscelio angustinubbin 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 : 34-35

Oxyscelio angustinubbin Burks sp. n. Figures 26-31Morphbank29

Description.

Female. Body length 4.15-4.35 mm (n=4).

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 or more broadly interrupted transverse carinae; 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: with oblique tooth-like flange (facial nubbin). Malar area at mouth corner: with one carina. Smooth strip along posterior side of malar sulcus: absent or not consistently broad. Middle genal carina: present. Direction of middle genal carina dorsally: parallel to eye margin. Major sculpture of gena anteriorly: umbilicate-foveate; rugose. 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-foveate; irregularly 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: 3. Number of carinae crossing femoral depression: 3-5. Mesepimeral sulcus pits: more than 5. Metascutellum dorsally: concave. Metascutellar sculpture dorsally: smooth or with transverse carinae. Median carina of metascutellum: absent or branched. Metascutellar setae: absent. Metascutellar apex: weakly emarginate. 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 middle of T5.

T1 midlobe: with 6 or more longitudinal carinae. T1: without anterior bulge. T2: with straight longitudinal striae or rugae. T6: longer than broad. Apical flange of T6: not exposed apically. Metasomal apex: tapering to a sharp point. Major sculpture of T6: umbilicate-punctate. Microsculpture of T6: granulate.

Male.Body length 4.25 mm (n=1). A5 tyloid: carina-like, not expanded. A11: longer than broad. Median tooth of frontal depression: absent. Median lobe of T1: with 5 longitudinal carinae. Metasomal apex: with acuminate lateral corners.

Diagnosis.

Both sexes: Face with a narrow oblique flange between antennal foramen and eye. Metascutellum not convex, not emarginate posteriorly. Female: Antennal club formed. A4 longer than broad. Fore wing long enough to reach middle of T5. T1 without anterior horn, midlobe with 6 longitudinal carinae. Male: A11 longer than broad. T1 midlobe with 5 longitudinal carinae. T7 with weakly acuminate posterolateral corners. Oxyscelio angustinubbin is similar to Oxyscelio foveatus and some other species with a broad metascutellum and oblique flange between the antennal foramen and eye. It is distinctive in entirely lacking a T1 horn in females, and can be recognized through several additional sculptural features. Especially, the oblique facial flange is much narrower than that the broad sculptured flange of Oxyscelio foveatus .

Etymology.

Compound noun meaning "narrow nubbin." Refers to the smaller than usual, smooth oblique flange between the antennal foramen and the eye.

Link to distribution map.

[http://hol.osu.edu/map-full.html?id=275518]

Material examined.

Holotype, female: INDONESIA: Sulawesi Utara Prov., “Edwards”, Toraut, Bogani Nani Wartabone (Dumoga-Bone) National Park, 680m, 26.IV-7.VI.1985, J. H. Martin, OSUC 58667 (deposited in BMNH).Paratypes: INDONESIA: 3 females, 1 male, OSUC 376617 (BMNH); OSUC 369233, 369291, 369298 (CNCI).

Comments.

The known male exhibits a narrower, more apically rounded metascutellum than in the females.