Xenomerus spinosus Mikó & Masner, 2010

Mikó, I., Masner, L. & Deans, A. R., 2010, World revision of Xenomerus Walker (Hymenoptera: Platygastroidea, Platygastridae) 2708, Zootaxa 2708, pp. 1-73 : 44-45

Xenomerus spinosus Mikó & Masner , new species

Figures 34, 37, 39, 40

FEMALE (Holotype): Length= 1.31 mm.

Dark brown, interantennal process, radicle, A1–A7, mandible, tegula and legs including coxae yellow, A8–A12 light brown.

FCI =1.20; LCI =1.73; HW/IOS =1.85; IOS shortest below eye midlevel; head about 1.5 times as wide as mesosoma (HW/TSL = 1.45); facial striae reaching vertex along inner orbit, obscuring frontal patch; frontal patch indistinct; frons setae dense, thin; central keel complete; toruli triangle shorter than clypeus height; POL as long as OOL (POL/OOL =1.0); OOL two times as long as LOL (OOL/LOL =2.0); hyperoccipital carina present, blunt, not extending to inner orbit; vertex patch present; genal patch absent; A1 2.5 times as long as radicle (A1/r =2.50), shorter than clava (A1/cl =0.86); A4 distinctly longer A3.

Epomial carina present, almost reaching pronotal suprahumeral sulcus; cervical pronotal area smooth, with scattered setae, setal bases pustulate; lateral pronotal area with transverse crenulae; netrion sulcus complete; netrional striation not extending onto lateral pronotal area; pronotal suprahumeral and cervical sulci complete, foveolate; mesoscutum 1.5 times as wide as long (TSL/ML =1.52); notaulus exceeding transscutal line; mesoscutum with dense, thin setae, setal bases pustulate, reticulate sculpture extending to lateral and internotaular areas, not reaching posterior margin of mesoscutum; mesoscutellum two times as wide as long (SW/SL =2.08); scutoscutellar sulcus slightly diminishing medially, less than 1.5 times as wide laterally as in the middle; mesoscutellum smooth, with a median spine and dense, long, thin setae; posterior scutellar sulcus not extending onto axillula; sternaulus not separated from anterior row of foveae of mesopleural carina, distance between postacetabular sulcus and anterior row of foveae of mesopleural carina nearly as wide as foveae width of postacetabular sulcus; mesopleural carina complete, with complete rows of foveae, foveae of mesepimeral sulcus 4 times as wide as posterior row of fovea of mesopleural carina, distance between posterior row of foveae and mesopleural sulcus less than foveae width of mesepimeral sulcus; sulcus along metapleural carina foveolate; metapleural epicoxal and lower part of metapleural sulci not merged; metascutellum sharply pointed; propodeal lateral carinae inverted Y-shaped, shafts straight; propodeal lateral area and plical areas obscured by thin, dense setae, marginal striation extending medially; posterior propodeal projection distinct, well developed; fore wing wider than mesoscutum (TSL/WW =0.76); marginal vein elongate, almost 5 times as long as stigmal vein (m/st =4.7); hind wing about 2.5 times as wide as marginal cilia length (HWW/HWS =2.46).

T1 less than 1.5 times as wide as T1+T2 length (T1W/T1+T2L =1.45); T3 about as wide as mesoscutum (T3W/TSL =1.04), costae on T3 posteriorly becoming into longitudinally rugoso-punctate sculpture, reaching almost the apex of tergum; lateral patches distinct, circular in shape; diameter of posterior patch of T3 equal to width of one basal depression; anterior half of T4 reticulate.

Diagnosis. Most similar to X. armatus , distinguished from it by the shorter IOS located below eye midlevel, larger eyes, longer head, clava and radicle, POL/OOL, hyperoccipital carina not extending to inner orbit, vertex sculpture slightly extending to frons between lateral ocellus and inner orbit, absence of median keel extending from anterior margin of mesoscutellum to median spine, presence of netrion sulcus, A4 distinctly longer than A3, longer marginal vein and more elongated metasoma.

Etymology. The name refers to the median spine of mesoscutellum.

Material examined. Holotype female: TAIWAN: Nantou County, Wushe , 1150m 10.V.1983, H.Townes [ CNCI: 23921] . Paratypes: TAIWAN: Nantou County, Wushe , 1150m, 26.IV.1983, H.Townes, 1♀ ; Nantou County, Wushe , 1150m 10.V.1983, H.Townes, 1♀ ; Nantou County, Wushe , 1150m 15.V.1983, H.Townes, 1♀ ; Nantou County, Wushe , 1150m 22.III.1983, H.Townes, flight trap, 1♀ . MALAYSIA: Sabah, Danum Valley , CA, 25.X–11.XII.1986, P.J.Eggleton [ BMNH] . Holotype is deposited in CNCI. Paratypes are deposited in BMNH (1) and CNCI (4) .