Paramesius spiracularis 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 : 467-470

Paramesius spiracularis Chemyreva et Kolyada , sp. nov.

( Figs 27–31 , 41 , 45, 46)

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Diagnosis. Paramesius spiracularis sp. nov. differs from all described Palaearctic species by the combination of these states: pronotal cervical area with a few long setae; neck bare; pleurostoma with semicircular blade anteriorly near base of mandibular; mesopleura ventrally with reticulation; propodeal spiracles large, its height only 4.0 (for females) or 5.0 (for males) times shorter than length of propodeum in lateral view. This species is similar to Paramesius rufipes (Fonscolombe) , but it differs from it by large propodeal spiracles (in lateral view its height eight times shorter than length of propodeum in P. rufipes ), full notauli (shallow anteriorly in Paramesius rufipes ), mesopleura ventrally with reticulation (without reticulation in P. rufipes ).

Description. Holotype. Female ( Figs 27–30 , 41 ). Body length 2.1 mm; fore wing length 1.6 mm; antenna length 1.4 mm.

Colour. Body and A11–A13 dark brown; leg, including coxae, palpi, A1–A8, tegula and propodeal spiracle cap yellowish brown; mandibles and A9–A10 brown.

Head. Head in dorsal view subquadrate, weakly wider than long (15:14), with scattered long setae. Occipital flange narrow and smooth. Postgenal cushion small, with dense and thin pilosity ( Fig. 28 ). Head in lateral view higher than long (16:14), subglobular. Eye height twice longer than malar space. Antennal shelf with distinct pressure between toruli. Face smooth and pubescent ( Fig. 27 ). Malar sulcus absent. Clypeus convex, semicircular, wider than high (10:7). Epistomal sulcus shallow. Tentorial pits small. Mandibles bidentate, teeth equal.

Antenna with slender, non-abrupt clava. In lateral view, A10–A13 separated by deep gaps and connection between A10–A13 situated dorsally ( Fig. 41 ). Ratios of length to width of antennomeres in dorsal view: A1 17.0:2.5; A2 5.0:2.0; A3 3.0:1.5; A4 2.5:1.5; A5 2.5:1.5; A6 2.5:1.5; A7 3.0:1.5; A8 2.5:1.8; A9 2.5:2.0; A10 3.0:2.2; A11 3.0:2.5; A12 3.5:3.0; A13 8.5:3.5.

Mesosoma in dorsal view longer than wide (24:19); in lateral view distinctly longer than high (24:18). Neck bare, with short and deep longitudinal grooves. Pronotal cervical area with long and short setae around neck and a few long setae above, bare lateraly. Pronotal cushion dense. Side of pronotum with row of foveae along posterior margin and with row of setae behind the foveae throughout. Mesoscutum slightly convex, with a few scattered semi-decumbent setae. Notauli complete throughout and well impressed, posteriorly weakly convergent; smallest distance between notauli shorter than between notauli and humeral sulcus (5:6). Humeral sulcus deep; mesoscutal suprahumeral sulcus distinct in lateral half and shallow near notaulus. Anterior scutellar pit deep and large, with three septums. Two lateral scutellar pits well impressed. Posterior scutellar pits numerous and deep; lateral rim sculptured. Mesopleuron with deep sulcus under tegula and with complete sternaulus. Area below sternaulus with longitudinal grooves and reticulation ( Fig. 28 ). Mesopleuron ventraly with reticulation. Metascutellum narrow, pubescent, with low medial keel and one low lateral keel. Propodeum distinctly transverse (10:6); lateral area pubescent, dorsal area bare. Median propodeal keel projecting into spine directed backward. Propodeal spiracle cap amber color, large ( Figs 28, 29 ), its height only 4.0 times shorter than length of propodeum in lateral view.

Wing. Forewing without basal, medial and Rs veins. Ratio of length to width of marginal vein11:2. Length of stigmal vein 2.5 times longer than width of marginal vein. Legs normal with tarsomeres elongated, claws curved.

Metasoma. Petiole in dorsal view cylindrical, twice longer than wide, with several longitudinal ridges and a few setae medially. Petiole in lateral view straight with long dense light and straight pubescence ventrally. T2 notch extremely tiny ( Fig. 29 ); T3–T4 narrow and bare; apex of female metasoma sharply conical, T5–T6 compressed laterally with numerous erect setae; T5 longer than T3–T4 together and T6. S2 with scattered erect setae; S3–S5 narrow and bare; S6 large with long erect hair.

Variation. Body length 1.9–2.5 mm. Wings 0.75–0.80 times as long as body. Petiole 0.30–0.37 times as long as T2. Anterior scutellar pit with 2–4 carinae.

Male. Body length 1.7–2.3 mm. Similar to female, but differs in features of antennal structure, petiole length. Occipital flange foveolate medially to smooth. 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. A2–A13 yellow to brown; A2–A4 and A1 same color (yellow) to A1 distinctly paler; A4 with keel extending to 0.42–0.54 of A4 length. Length to width of antennal segments: A1 14.0:2.5; A2 4.5:2.3; A3 4.0:2.2; A4 13.0:2.0; A5 13.0:2.0; A6 13.0:1.8; A7 12.5:1.8; A8 12.0:1.8; A9 11.0:1.7; A10 11.5:1.5; A12 12.0:1.5; A13 11.0:1.5. Notauli weakly sculptured at bottom to smooth. Mesopleura ventrally with reticulation and keel extending from anterior to median coxae ( Fig. 27 ). Anterior scutellar pit with 1–3 carinae. Petiole 0.40–0.53 times as long as T2.

Type material. Holotype: ♀ ( ZISP) labeled “ Russia , Primorsky Terr., vicinity of Spassk-Dal’niy, 17– 19.VII.1991, S. Belokobylskij ”, “ Paramesius spiracularis Chem. & Kolyada, 2018 ” . Paratypes. RUSSIA .

Khabarovsk Terr ., Khabarovsk, dendrarium, 22.VIII.1970, DK, 1♀ ( ZISP) ; Boytsovo, 20 km N from Bikin , 26.V.1993, SB, 1♀ ( ZISP) . Primorsky Terr., Khorol’ , 31.VII.1961, M. Kozlov, 1♂ ( ZISP) ; Gornotayozhnoe , 6– 15.IX.2003, M. Michaylovskaya, 1♂ ( ZISP) ; Ussuriysk Nature Reserve , 26–30.VII.2014, VC, 2♀ ( ZISP) ; Ussuriysk Nature Reserve, vicinity of Kamenushka , 17.VIII.1987, V. Kostyukov, 1♂ ( ZISP) ; vicinity of Novokachalinsk, Khanka Lake , 21–23.VIII.1995 SB, 2♀ ( ZISP) ; Lazo Nature Reserve, 18 km SW from Lazo , 26– 29.VIII.2006, SB, 1♀ ( ZISP) . Kunashir Island, Dubovoe , 20–22.VII.2011, E. Tselikh, 1♂ ( ZISP) .

Host. Unknown.

Distribution. Russia (Primorsky Territory, Khabarovsk Territory, Kuril Islands).

Etymology. The name derived from “spiracle”, in reference to the extremely large female spiracles.

FIGURES 43–52. Antennal segments A2–A4 of male in lateral (43–47) and dorsal (48–52) view. 43, 48, P. rufipes ; 44, 49, P. spiracularis sp. nov.; 45, 50, P. janmaceki sp. nov.; 46, 51, P. ocampus sp. nov.; 47, 52, P. primorus sp. nov. Scale bar 100 µm.

Figures

FIGURES 27–31. P. spiracularis sp. nov. ♀ (27–30) and ♂ (31). 27, mesosoma, ventral view; 28, mesosoma, lateral view; 29, mesosoma, dorsal view; 30, mesosoma, frontal view; 31, head, mesosoma and petiole, lateral view. Scale bar 200 µm.

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.