Spilomicrus nottoni, Chemyreva, Vasilisa G., 2015

Chemyreva, Vasilisa G., 2015, Three new species of the parasitic wasps genus Spilomicrus Westwood (Hymenoptera: Diapriidae) from the East Palaearctic Region, Zootaxa 4059 (1), pp. 191-200 : 195-197

Spilomicrus nottoni sp. nov.

( Figs 10–16 )

Diagnosis. This new species distinctly differs from the all Palaearctic species by broad occipital flange ( Figs 10, 14 ), maculated wing ( Fig. 13 ), face punctate throughout ( Fig. 12 ) and male A4 without keel but with dense protruding setae in area of notch ( Fig. 16 ). Differences between S. notaulus sp. nov. and S. nottoni sp. nov. are described in the key (see couple 3). S. nottoni is also similar to S. exul Masner , but differs in anterior incision of mesopleuron present (absent in S. exul ), head in lateral view rhomboidal (more or less round in S. exul ), ridge behind eye absent (present in S. exul ), face strongly and densely punctate, tentorial pits distinct, malar sulcus absent (tentorial pits absent, malar sulcus distinct and face smooth in S. exul ), A4 of male weakly excavated, without keel and with stubbly setae in the notch area ( Fig. 16 ) (A4 of male distinctly excavate basally, with keel and without stubbly setae in S. exul ), propodeal keel pointed but not forming long spine (with long spine in S. exul ).

Description. Holotype. Female ( Figs 10–12, 14–15 ). Body length 3.6 mm; fore wing length 2.8 mm; antenna length 2.2 mm.

Colour. Body mainly black; tegula, legs, palpi, distal part of A1 and antennal segments A2–A7 reddish brown; A8–A13 dark brown; mandible dark basally and reddish apically.

Head. Head in dorsal view weakly transverse (27:26), narrower than width of mesosoma (25:29); in lateral view shorter than high (31:35), with prominent antennal shelf ( Fig. 10 ). Frons, genae and vertex with sparse setigerous punctures, face deeply punctate ( Fig. 12 ). Tentorial pits present. Malar sulcus absent. Clypeus transverse (13:9), semicircular, convex. Epistomal sulcus present, partly flattened. Ratio of pleurostomal distance to width of head 16:28. Mandible long, bidentate, with subequal teeth. Eye height shorter than half height of head (20:43) and longer than malar sparse (20:13); eye with long sparse setae, not surrounded by grooves. Ocelli large ( Fig. 10 ); LOL 1.5 times as long as diameter of anterior ocellus; POL longer than OOL (8:7). Occipital flange broad, with several long setae medially ( Figs 10, 14 ). Postgenal cushion dense ( Fig. 10 ).

Antenna. A1 cylindrical, with two projecting lamellae apically overlapping base of A2 and densely covered with pale setae. A2 compressed, in lateral view subquadrate (7:6), in dorsal view attenuate at base and broad apically. Clava non-abrupt, A8–A13 with MGS brush and flattened on ventral side. In lateral view, connection between A8–A13 situated dorsally ( Fig. 15 ). A13 distinctly narrower than A12, with ventral tip. Ratios of length to width of antennomeres in dorsal view: A1 39:8; A2 7:6; A3 12:6; A4 10.5:6; A5 9:5.5; A6 8:5.5; A7 8:6; A8 7:6; A9 8:8; A10 8:8.5; A11 8:10; A12 8:10; A13 11:8.

Mesosoma. Mesosoma in lateral view longer than high (50:30); in dorsal view longer than wide (50:29). Neck bare, with deep longitudinal grooves. Pronotal median area not separated from lateral areas. Pronotal shoulders moderately prominent, rounded; pronotal cushion dense. Lateral pronotal area smooth. Anterior incision of mesopleuron small ( Fig. 10 ). Propleuron smooth, covered with short silvery pubescence, without reticulation. Mesopleuron with ventral side pubescent, smooth, shining and bare laterally. Sternaulus extending from anterior incision of mesopleuron to posterior margin of mesopleuron as sharp keel. Mesopleuron above sternaulus without depression. Acetabular carina sharp, strongly prominent and strongly moved posteriorly in medial part; postacetabular sulcus absent. Mesopleural epicoxal carina present only laterally; mesopleural epicoxal sulcus and carina on ventral side absent. Mesonotum wider than long (35:32). Notauli broad, deep posteriorly and shallow anteriorly. Humeral sulcus shallow. Scutellum flattened, with two large circular anterior scutellar pits. Axilla with broad grooves along its posterior margin. Axillar depression pubescent. Lateral scutellar pits strongly enlarged, broad and long. Posterior scutellar pits, small ( Fig. 14 ). Metascutellum pubescent, with projecting median keel and one lateral keel. Median propodeal keel projecting into long spine directed upward; propodeum entirely coarsely rugose, with dense silvery pilosity. Propodeum in dorsal view with posterior margin arcuate. Legs long and slender. Hind leg without delimited trochantellus.

Wings. Fore wing weakly maculate ( Fig. 13 ), longer than wide (54:20). Marginal vein elongate (11:3). Stigmal vein shorter than width of marginal vein. Costal and submarginal veins tubular; costal vein faintly sclerotized. Basal vein nebulous.

Metasoma. Petiole cylindrical, elongate (12:8), with deep dorsal, lateral and ventral longitudinal grooves extending its entire length; pubescent on lateral and ventral sides, and, on dorsal side, with long setae only on distal half of petiole. Petiole length/mesosoma length 6:25. T2 with short sparse setae on posterior and lateral area and with micropunctures posteromedially. T3–T5 each with dense punctation and with one row of long setae, the setae becoming denser laterally. T5 expanded and laterally covered by numerous setae. T6 small, T7 short, pointed. S2 smooth, with dense cushion at anterior margin and with sparse setae posteriorly. S3–S5 with dense punctation and each with one row of long setae. Apical sternite entire covered with coarse and dense punctation, and with short setae apically.

Male (figs 13, 16). Body length 2.7–3.9 mm. Similar to female, but differs in features of antennal structures and petiole. Antenna filiform, slightly longer than body, red. A1 with moderately projecting lamellae. A 2 in lateral view subquadrate. A4 weakly excavated, without keel, with dense protruding setae in area of notch. Antennal segment length/width in dorsal view: A1 22:5; A2 5:4.5; A3 14:5; A4 15:5; A5 13:4.5; A6 12:4.5; A7 12:4.5; A8 11.5:4.5; A9 11:4.5; A10 11:4.5; A11 11:4.5; A12 10:4; A13 13:4. Petiole length/mesosoma length 4:9.

Host. Unknown.

Etymology. Named in honor of the British hymenopterist and expert on Diapriidae David Notton.

Type material. Holotype: ♀ ( ZISP) labelled, “ RUSSIA, Primorskiy Terr., near Kaymanovka, 30.viii.1982, S. Belokobylskij”, “ Holotype. Spilomicrus nottoni Chemyreva det. 2014”.

Paratypes. RUSSIA. Primorskiy Terr., Ussuriyskiy Nature Reserve, 28–30.viii.1982, S. Belokobylskij (2♂, ZISP); Laso Nature Reserve, 10–13.VIII.2010, E. Tselikh (1♂, ZISP).

Figures

FIGURES 10 – 16. Spilomicrus nottoni sp. nov., female (10 – 12, 14 – 15) and male (13, 16). 10, head, lateral view; 11, 13, whole insect, lateral view; 12, face; 14, mesosoma, dorsal view; 15, whole antenna; 16, antennae (A 2 – A 5); aim, anterior incision of mesopleuron.