Paramesius janmaceki Chemyreva et Kolyada, 2018

Chemyreva, Vasilisa G. & Kolyada, Victor A., 2018, Review of the genus Paramesius Westwood, 1832 (Hymenoptera: Diapriidae, Spilomicrini) from Russia, with description of four new species, Zootaxa 4524 (4), pp. 453-472 : 459-462

Paramesius janmaceki Chemyreva et Kolyada , sp. nov.

(Figs 18–20, 40, 42, 45, 50)

urn:lsid:zoobank.org:act:6826CE88-C21A-40A7-B6B6-D913F60C7947

Diagnosis. Paramesius janmaceki sp. nov. easy differs from the all known Palaearctic species the combination of the following characters: present two lines of short furrow on pronotal cervical area; pronotal cervical area with a few long setae; neck bare; notauli full and well impressed; anterior scutellar pit of female weakly transverse, 1.7– 1.6 times wider than long, with one keel; pleurostoma with semicircular blade anteriorly near base of mandibular. This new species is very similar to Paramesius rufipes (Fonscolombe) , but differs from it by following features: pronotal cervical area sculptured (smooth in P. rufipes ), notauli full and deep (shallow anteriorly in P. rufipes ), anterior scutellar pit of female 1.7–1.6 times wider than long, with one keel (2.2–2.4 times wider than long, with 2– 4 keels in P. rufipes ).

Description. Holotype. Female. Body length 2.9 mm; fore wing length 2.3 mm; antennae length 1.9 mm.

Colour. Head, A11–A13 and mesosoma dark brown; metasoma reddish brown; legs, palpi and A1–A9 yellow; tegula and A10 brown.

Head in dorsal view as long as wide, with scattered long setae. Occipital flange narrow, finely punctured. Postgenal cushion small, with dense and thin pilosity. Head in lateral view weakly higher than long (19:17), subglobular. Eye height larger than malar space (8:5). Antennal shelf with distinct pressure in the middle part between toruli. Face smooth and pubescent. Malar sulcus absent. Clypeus convex, semicircular, wider than high (12:7). Epistomal sulcus shallow. Tentorial pits small. Mandibles bidentate, teeth subequal.

FIGURES 14–20. P. primorus sp. nov. (14–17) and P. janmaceki sp. nov. (18–20). ♀ (14, 15, 17–19) and ♂ (16, 20). 14, 16, 18, 20, mesosoma and petiole, dorsal view; 15, 19, mesosoma, frontal view; 17, part of mesosoma, lateral view. Scale bar: 200 µm (15, 17, 19); 500 µm (14, 16, 18, 20).

Antenna with non-abrupt clava. In lateral view, A10–A13 separated by deep gaps, connection between A10–A13 situated dorsally. Ratios of length to width of antennomeres in dorsal view: A1 20.0:3.0; A2 5.0:2.3; A3 3.5:2.0; A4 2.7:2.0; A5 3.0:2.0; A6 3.0:2.0; A7 3.0:2.2; A8 3.0:2.5; A9 2.8:3.0; A10 3.0:3.0; A11 3.0:3.2; A12 3.0:4.0; A13 7.0:4.5.

Mesosoma in dorsal view longer than wide (30:20); in lateal view distinctly longer than high (30:21). Neck bare, with deep longitudinal grooves. Pronotal cervical area with a few long setae and with two lines of short furrow (Fig. 19). Pronotal cushion dense. Side of pronotum with row of foveae along posterior margin and with row of setae behind the foveae. Mesoscutum flattened, with a few scattered semi-decumbent setae. Notauli complete throughout and well impressed, weakly convergent posteriorly; smallest distance between notauli shorter than between notauli and humeral sulcus (4:5). Humeral sulcus deep, sculptured at bottom; mesoscutal suprahumeral sulcus partly developed laterally and shallow medially. Anterior scutellar pit deep and large, with one septum. Two lateral scutellar pits well impressed. Posterior scutellar pits numerous and deep; lateral rim sculptured. Mesopleuron with deep sulcus under tegula and complete sternaulus. Area below sternaulus with longitudinal rugosity. Mesopleuron ventraly with irregular sculpture near coxa and smooth medialy. Metascutellum narrow, pubescent, with low medial keel and one low lateral keel. Propodeum distinctly transverse (13:7); lateral area pubescent, dorsal area bare. Median propodeal keel projecting into spine directed backward. Propodeal spiracle cap small, same color as propodeum.

Forewing without basal, medial and Rs veins. Ratio of length to width of marginal vein 10:3. Stigmal vein 3.0 times longer than width of marginal vein. Legs normal with tarsomeres elongate, claws curved.

Metasoma. Petiole in dorsal view cylindrical, elongate (10:6), with several longitudinal ridges and almost without setae. Petiole in lateral view weakly curved, with long thin and dense straight pubescence ventrally. T2 notch extremely tiny (Figs 18, 19); T3–T4 narrow and bare; apex of female metasoma sharply conical, T5–T6 compressed laterally with numerous erect setae; T5 longer than T6 and T3–T4 together. S2 with numerous erect setae; S3–S5 narrow and bare; S6 large, 3.5 times longer than S3–S5 together, with long erect setae.

Variation. Body length 2.6–3.0 mm. Wings 0.59–0.79 times as long as body. A8–A12 subquadrate to elongate. Petiole 0.29–0.36 times as long as T2.

Male. Body length 2.3–3.0 mm. Similar to female but differs from it by following features: head in frontal view subquadrate (23:23); antenna thin and long, 1.5 times longer than body (92:60); A3–A13 with dense, semidecumbent pubescence, as long as or shorter than maximal width of antennomeres; A2–A13 pale brown to brown; A1 yellow, distinctly paler than A2–A4; A4 with keel extending to 0.40–0.53 of A4 length; length to width of antennal segments: A1 18.0:3.5; A2 5.5:3.0; A3 5.5:2.5; A4 18.0:2.5; A5 19.0:2.5; A6 18.5:2.2; A7 18.5:2.0; A8 18.0:2.0; A9 18.0:2.0; A10 17.0:1.7; A12 17.0:1.5; A13 18.0:1.5; anterior scutellar pit with 1–4 carinae; petiole 0.43–0.40 times as long as T2.

Type material. Holotype: ♀, ( ZISP) labelled ” RUSSIA, Primorsky Terr., vicinity of Khasan , 27– 30.VIII.1988, S.Belokobylsky ”, ” Paramesius janmaceki Chem. & Kolyada, 2018 ” . Paratypes: RUSSIA, Kuril Islands, Kunashir Island, vulcano Golovnina , 1.IX.1982, S. Sinev, 1♀ ( ZISP) ; same locality, 3–10.VIII and 22.VIII–1.IX.1973, DK, 2♀, 3♂ ( ZISP) ; Shikotan Island, Malokurilskoe , 20–21.VIII.1973, DK, 2♂ ( ZISP) .

Host. Unknown.

Distribution. Russia (Primorsky Territory, Kuril Islands: Kunashir, Shikotan).

Etymology. Named in honor of Dr Jan Macek, a well-known Czech hymenopterist, and expert on Diapriidae and Symphyta.