Xenomerus armatus 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 : 13-14

Xenomerus armatus Mikó & Masner , new species

Figures 35, 36, 38, 41

FEMALE (Holotype): Length= 1.04 mm.

Black, interantennal process, mandible, radicle, A1–A7, tegula and legs excluding brown coxae yellow, A8–A12 brown.

FCI =1.18; LCI =2.05; HW/IOS =1.57; IOS shortest about eye midlevel; head less than 1.5 times as wide as mesosoma (HW/TSL = 1.38); facial striae reaching vertex along orbit; frontal patch indistinct, obscured by facial striae; frons setae dense, thin; central keel complete; toruli triangle shorter than clypeus height; POL 1.2 times as long as OOL (POL/OOL =1.2); OOL 1.5 times as long as LOL (OOL/LOL =1.53); hyperoccipital carina present, blunt, extending to inner orbit; vertex smooth; vertex and genal patch absent; A1 more than 3 times as long as radicle (A1/r =3.2), as long as clava (A1/cl =0.96); A3 distinctly longer A4.

Epomial carina well developed, almost reaching pronotal suprahumeral sulcus; cervical pronotal area smooth, with scattered setae, setal bases pustulate; lateral pronotal area with transverse crenulae; netrion sulcus absent; netrion sculpture slightly extending onto lateral pronotal area; pronotal suprahumeral and cervical sulci complete, foveolate; mesoscutum about 1.5 times as wide as long (TSL/ML =1.45); notaulus reaching transscutal line; mesoscutum with dense, thin setae, setal bases pustulate, reticulate sculpture extending to lateral and inter notaular areas; mesoscutellum about two times as wide as long (SW/SL =1.91); scuto-scutellar 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, marginal setae; keel extending from middle of anterior margin of mesoscutellum to apex of median spine; posterior scutellar sulcus 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 on postacetabular sulcus; mesopleural carina complete with complete rows of foveae; foveae of mesepimeral sulcus 4 times as wide as width of posterior row of fovea of mesopleural carina, distance between posterior row of foveae and mesopleural sulcus less than foveae width on mesepimeral sulcus; metascutellum sharply pointed; sulcus along metapleural carina foveolate; epicoxal and lower part of metapleural sulci not merged; propodeal lateral carinae inverted Y-shaped; propodeal lateral and plical areas obscured by thick, dense setae, marginal striation extending medially; plica absent; posterior propodeal projection well developed; mesoscutum as wide as fore wing (TSL/WW =1.08); marginal vein about 2.5 times as long as stigmal vein (m/st =2.7); hind wing less than 2.5 times as wide as marginal cilia length (HWW/HWS =2.36).

T1 two times as wide as T1+T2 length (T1W/T1+T2L =2.0); T3 about as wide as mesoscutum (T3W/ TSL =0.93); costae on T3 graduating posteriorly into longitudinally rugoso-punctate sculpture, reaching almost the posterior margin of tergum; lateral patches distinct, circular in shape; posterior patch of T3 indistinct, obscured by longitudinally rugoso-punctate sculpture; anterior half of T4 entirely reticulate.

Variability.

MALE: Unknown.

Diagnosis. Most similar to X. spinosus , differing by longer IOS located in eye midlevel, smaller eyes, shorter head, clava and radicle, POL/OOL, hyperoccipital carina extending to inner orbit, vertex sculpture not extending to frons, presence of median keel extending from anterior margin of mesoscutellum to median spine, absence of netrion sulcus, A4 as long as A3, shorter marginal vein and less elongated metasoma.

Etymology. The name refers to the unique armature of mesoscutellum

Material examined. Holotype female: THAILAND: Uthai Thani Province, Uthai Thani District, Khao Nang Rum , 400m V.1986, M.G.Allen, MT [ BMNH: BMNH:HYM.9.924] . Paratypes: Chantaburi Province, Soi Dao, Forest Insect Centre , 13.0025, 102.2852, 197m, 16.I.2005, M.Sharkey, 1♀ ; Phupamarn National Park , GPS48Q180449, UTM7854128, 1–14.III.2005, 1♀ [ QSBG], 1♀ ; Phitsanulok, Thung Salaeng Luang NP Dry evergreen 16.836, 101.875, 580m, 11–18.VIII.2006, Pongpitak Pranee, 1♀ .

Holotype is deposited in BMNH . Paratypes are deposited in CNCI (3) and QSBG (1).