Xenomerus vanharteni 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 : 45-46

Xenomerus vanharteni Mikó & Masner , new species

Figures 23, 24

FEMALE (Holotype): Length= 0.62 mm.

Brown; radicle, trochanters and tarsomeres, except apical brown tarsomeres lighter.

FCI =1.13; LCI =1.60; HW/IOS =1.51; head less than 1.5 times as wide as mesosoma (HW/TSL = 1.35); facial striae not exceeding midlevel of eye, exceeding and obscuring frontal patch; frontal patch distinct; frons setae sparse, thin; central keel complete; POL about 3 times as long as OOL (POL/OOL=3.16); OOL shorter than LOL (OOL/LOL =0.66); hyperoccipital carina present, keellike, extending to inner orbit, vertex smooth, genal patch absent; A1 2.5 times as long as radicle (A1/r =2.50), as long as clava (A1/cl =1.08).

Epomial carina absent, cervical pronotal area smooth, bare; netrion absent, lateral pronotal area with few crenulae above pronotal ventral projection; pronotal suprahumeral and cervical sulci not foveolate; mesoscutum less than 1.5 times as wide as long (TSL/ML =1.23); notaulus absent, mesoscutum smooth; mesoscutellum less than 2.5 times as wide as long (SW/SL =2.34); scuto-scutellar sulcus almost as wide medially as laterally; mesoscutellum smooth, with sparse setae; posterior scutellar sulcus not extending onto axillula; meso- and metapectus, except foveolate mesepimeral sulcus, without any foveae; mesopleural carina incomplete; metapleural sulcus reduced to metapleural pit; metascutellum foveolate, metanotal spine absent; propodeal lateral carinae widely separated, forking, plica present, propodeal striation absent; plical area with sparse setae, posterior propodeal projection absent; mesoscutum about as wide as fore wing (TSL/ WW =0.92); marginal vein less than 3 times as long as stigmal vein (m/st =3.33); hind wing more than 1.5 times as wide as marginal cilia length (HWW/HWS =1.65).

T1 as wide as T1+T2 length (T1W/T1+T2L =1.01); T3 less than 1.5 times as wide as long (T3W/ T3L =1.36), about as wide as mesoscutum (T3W/TSL =0.91); T3 smooth, lateral and posterior patches absent; T4 smooth.

MALE: A2–A11 unibottled, A5 modified.

Diagnosis. Differs from all other Xenomerus species by the sharp hyperoccipital carina extending to inner orbit, absence of notaulus, and the structure of propodeum.

Etymology. Named after Antonius van Harten, the collector of the species.

Material examined. Holotype female: YEMEN: Ar Rujum , 15.I–09.IV.2001, A.van Harten, MT [ CNCI: 23922] . Paratypes: YEMEN: Ar Rujum , 15.I–09.IV.2001, A.van Harten, MT. 1♀ ; Ar Rujum , 16.X.2000 – 15.I.2001, A.van Harten, MT, (5471), 1 ♂ .

Other material examined. YEMEN: Ar Rujum , 15.I–09.IV.2001, A.van Harten, MT, 1♀, (on slide) . Holotype and paratypes are deposited in CNCI.

Notes. Some of the diagnostic characters of Xenomerus are highly reduced in X. vanharteni , however, the bottle shaped male flagellomeres with erect, long bristles and palpal formula (3:1) makes it evident, that X. vanharteni belongs to the genus Xenomerus .