Oxyscelio crustum 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 : 89-91

Oxyscelio crustum Burks sp. n. Figures 139-144Morphbank51

Description.

Female. Body length 3.25-3.4 mm (n=4).

Radicle color: darker than 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: without transverse or oblique carinae below submedian carina. 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: 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. 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: complete, continuous with anterior genal carina. Lateral connection between hyperoccipital and occipital carinae: absent. Area between vertex and occipital carina: umbilicate-foveate; irregularly rugose. Occipital carina medially: uniformly rounded. Lateral corners of occipital carina: not 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; transversely 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: more than 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: with many dorsal setae. Metascutellar apex: weakly emarginate. Metapleuron above ventral metapleural area: crossed by carinae. Metasomal depression setae: absent. Lateral propodeal carinae anteromedially: weakly diverging. Anterior areoles of metasomal depression: one or more areoles present. Anterior longitudinal carinae in metasomal depression: absent. Lateral propodeal areas: separated medially. Postmarginal vein: present. Fore wing apex: reaching apex of T5; reaching middle of T6.

T1 midlobe: with 5 longitudinal carinae; obscured by other raised sculpture. T1: without anterior bulge; with small rounded anterior bulge, not reaching metascutellum. T2: with straight longitudinal striae or rugae. T6: broader than long; as long as broad. Apical flange of T6: exposed apically. Metasomal apex: rounded; tapering to a sharp point. Major sculpture of T6: umbilicate-punctate; longitudinally striate or rugose. Microsculpture of T6: absent.

Male. Body length 3.1-3.35 mm (n=). A5 tyloid: carina-like, not expanded. A11: broader than long; as long as broad. Median tooth of frontal depression: absent. Median lobe of T1: with 5 longitudinal carinae. Metasomal apex: with acuminate lateral corners.

Diagnosis.

Both sexes: Frons without elevation between antennal foramen and eye. Hyperoccipital carina present, continuous with anterior genal carina; occipital carina incomplete medially. Metascutellum with dorsal setae. Metasomal depression elongate, with a single areole strongly defined by a posterior carina; lateral propodeal carinae narrowly separated anteriorly. Female: A4, A5 longer than broad. T1 midlobe with 5 longitudinal carinae. Male: Frontal depression without tooth-like median protrusion dorsally. T1 midlobe with 5 longitudinal carinae. T7 with sharp, narrowly protruding posterolateral corners. Among members of the Oxyscelio mesiodentis -complex, Oxyscelio crustum is distinctive in having relatively weak surface sculpture. The propodeal areole and usually amber color can also help in distinguishing this species. It is very similar to the Philippine species Oxyscelio crassicornis , but lacks the median carina present between the hyperoccipital and occipital carinae in that species

Etymology.

Latin noun in apposition to the generic name, meaning “pie.” Suggested by the crinkly appearance of the surface sculpture.

Link to distribution map.

[http://hol.osu.edu/map-full.html?id=275555]

Material examined.

Holotype, female: MALAYSIA: Sabah St., rainforest edge, Danum Valley Protection Forest Reserve, 25. X– 11.XII.1986, malaise trap, P. J. Eggleton, OSUC 369329 (deposited in BMNH). Paratypes: (3 females, 86 males) BRUNEI: 1 male, OSUC 376632 (BMNH). INDONESIA: 1 female, 37 males, OSUC 376659, 376662 (BMNH); OSUC 369081, 369084 (CNCI); OSUC 247843, 273320, 352906, ROMEnt Spec. No. 112252, ROMEnt Spec. No. 112259 (MBBJ); OSUC 228689, 247841, 247960, 247963, 257034, 257036, 257052-257053, 257420-257421, 257423, 257428 (OSUC); OSUC 228740, 240925, 240929, 247848, 247851-247852, 247861, 247863, 247967, 248898, 251432, 251436-251437, 251440, 257080, 361272, 361720 (ROME). MALAYSIA: 46 males, OSUC 203136 (AEIC); OSUC 376582 (BMNH); OSUC 368956, 369021-369022 (CNCI); OSUC 376750 (MCZC); OSUC 381323, 453754-453760, 453762, 453765-453766, 453769, 453773-453775, 453777, 453779, 453781, 453783-453786, 453793, 453796-453798, 453800-453802, 453804-453805, 453807-453809, 453811-453815 (OSUC); OSUC 448590 (WINC). THAILAND: 2 females, 4 males, OSUC 368491 (BMNH); OSUC 309264, 352529 (OSUC); OSUC 352459, 361363 (QSBG); OSUC 361215 (WINC).