Paramesius ocampus 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 : 462-464

Paramesius ocampus Chemyreva et Kolyada , sp. nov.

(Figs 21–23, 33, 46, 51)

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Diagnosis. Paramesius ocampus sp. nov. can be differentiated from all described Palaearctic species by the combination of these states: pleurostoma with semicircular blade anteriorly near base of mandibular; pronotal cervical area smooth with a few long setae; neck bare; female A13 1.15–1.38 times longer than A12 and A11 together; male emargination of A4 extending beyond middle of the segment; notauli full and well impressed throughout mesoscutum; mesoscutal suprahumeral sulcus full and deeply sculptured at bottom. Differences between females P. ocampus sp. nov. and P. crassicornis Thomson are described in the key (see couple 7). P. ocampus is also similar to the Palaearctic P. rufipes (Fonscolombe) but differs by the full and deep notauli and mesoscutal suprahumeral sulcus (notauli shallow anteriorly and mesoscutal suprahumeral sulcus absent in P. rufipes ); A12 subquadrate (mainly elongate in P. rufipes ); male A4 with emargination extending beyond middle of the segment (not extending beyond middle in P. rufipes ).

FIGURES 21–26. P. ocampus sp. nov. (21–23) and P. rufipes (24–26). ♀ (21, 22, 25, 26) and ♂ (23, 24). 21, 23, 25, mesosoma and petiole, dorsal view; 22, 26, mesosoma, frontal view; 24, head, lateral view. Scale bar 200 µm.

Description. Holotype. Female. Body length 1.8 mm; fore wing length 1.7 mm; antennae length 1.3.

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

Head in dorsal view weakly wider than long (15:14), with scattered long setae. Occipital flange narrow, finely punctured. Postgenal cushion small, with dense and thin pilosity. Head in lateral view higher than long (16:14), subglobular. Eye height longer than malar space (7:4). Antennal shelf in frontal view with distinct pressure in the middle part between toruli. Face smooth and pubescent. Malar sulcus absent. Clypeus convex, semicircular, wider than high (5:3). Epistomal sulcus shallow. Tentorial pits small. Mandibles bidentate, teeth subequal.

Antenna with non-abrupt clava. In lateral view, A10–A13 separated by deep gaps and connection between A10–A13 situated dorsally ( Fig. 33 ). Ratios of length to width of antennomeres in dorsal view: A1 17.0: 2.7; A2 4.0:2.2; A3 3.0:1.8; A4 2.5:1.8; A5 2.5:1.8; A6 2.5:1.8; A7 3.0:2.0; A8 3.0:2.2; A9 3.0:2.5; A10 3.0:2.5; A11 3.0:2.5; A12 3.0:3.0; A13 8.0:3.5.

Mesosoma in dorsal view longer than wide (25:15); in lateal view distinctly longer than high (25:16). Neck bare, with deep pits. Pronotal cervical area with a few long setae (Fig. 22). Pronotal cushion dense. Side of pronotum with row of foveae along posterior margin and with row of setae between the foveae and spiracle. Mesoscutum weakly convex, with a few scattered semi-decumbent setae. Notauli complete throughout and well impressed, weakly convergent posteriorly; smallest distance between notauli as long as between notauli and humeral sulcus. Humeral sulcus deep, sculptured at bottom; mesoscutal suprahumeral sulcus full and deep (Fig. 22). Anterior scutellar pit deep and large, with two septum. Two lateral scutellar pits well impressed. Posterior scutellar pits fused together, shallow; lateral rim smooth. Mesopleuron with deep sulcus under tegula and complete sternaulus. Area below sternaulus and with irregular sculpture; mesopleuron ventrally near coxae sculptured and smooth medially. Mesopleuron ventrally smooth. Metascutellum narrow, pubescent, with low medial keel and one low lateral keel. Propodeum distinctly transverse (11:6); 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 12:2. Stigmal vein twice longer than width of marginal vein. Legs normal with tarsomeres elongate, claws curved.

Metasoma. Petiole in dorsal view cylindrical, elongate (9:5), with several longitudinal ridges and almost without setae. Petiole in lateral view weakly curved, with long, thin and dense straight pubescence ventraly. T2 notch extremely tiny (Fig. 21); 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, 3.8 times longer than S3–S5 together, with long erect hairs.

Variation. Female. Body length 1.6–2.5 mm. Occipital flange smooth or punctured. Lateral rim smooth to distinctly sculptured. Wings 0.76–0.83 times as long as body. Petiole 0.30–0.36 times as long as T2. Anterior scutellar pit with 2–3 carinae.

Male. Body length 1.5–1.9 mm. Similar to female, but differs mainly in features of antennal structure petiole length. Head in frontal view transverse (17:14). Antenna thin and long 1.6 times longer than whole body, A3–A13 with dense, semi-decumbent pubescence, as long as or shorter than maximal width of antennomeres. A1–A13 palebrown to brown; A2 –A4 same color with A1 or A1 weakly paler; A4 with keel extending to 0.55–0.60 of A4 length. Length to width of antennal segments: A1 20.0:4.5; A2 7.5:4.2; A3 6.0:3.5; A4 21.0:3.5; A5 22.0:3.5; A6 22.0:3.0; A7 22.0:3.0; A8 22.2:3.0; A9 20.0:3.0; A10 19.0:2.5; A12 19.0:2.5; A13 19.0:1.5. Notauli weakly sculptured at bottom. Anterior scutellar pit with 1–4 carinae. Petiole 0.38–0.48 times as long as T2.

Type material. Holotype: ♀ ( ZISP) labelled ” Russia, Primorsky Terr., Ussuriysk Distr., 20 km SW from Putsilovka , 27.VI.1993, S.Belokobilskij ”, ” Paramesius ocampus Chem. & Kolyada, 2018 ” . Paratypes. RUSSIA :

Primorsky Terr., Ussuriysk Nature Reserve , 26–30.VII.2014, VC, 2♀ ( ZISP) ; vicinity of Spassk-Dal’niy, 17– 19.VII.1991, SB, 1♀, 1♂ ( ZISP) ; Khasan Distr., ”Kedrovaya Pad” Nature Reserve , 14.VIII.2014, VC, 1♀ ( ZISP) ; Ussuriysk Distr., Gornotayozhnoe , 17–23.VII and 6–15.IX. 2003, M. Michaylovskaya, 3♂ ( ZISP) ; Ussuriysk Nature Reserve,vicinity of Kaymanovka , 30.VIII.1982, VT, 1♀ ( ZISP) ; same locality, 25–27.VIII.2010, E.Tselikh, 1♀ ( ZISP) ; Ussuriysk Distr., 20 km from Krounovka , 5.VIII.1993, SB, 2♂ ( ZISP) . Sakhalin Island, vicinity of Novoaleksandrovsk , 7.IX.1973, DK, 1♀ ( ZISP) .

Host. Unknown.

Distribution. Russia (Primorsky Territory, Sakhalin).

Etymology. The name of this species is an arbitrary euphonious combination of letters, with no special meaning.

Figures

FIGURES 32–42. 32, Apexes of female antennae in lateral (32–35, 38–41) and dorsal (36, 37, 42) views. 32, P. brachypterus; 33, P. ocampus sp. nov.; 34, 36, P. primorus sp. nov.; 35, P. belytoides; 37, 39, P. crassicornis; 38, P. rufipes; 40, 42, P. janmaceki sp. nov.; 41, P. spiracularis sp. nov. Scale bar 100 µm.