Spilomicrus notaulus, 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 : 192-194

Spilomicrus notaulus sp. nov.

( Figs 1–9 )

Diagnosis. Spilomicrus notaulus sp. nov. can be differentiated from all described Palaearctic species by the combination of these states: notauli well impressed throughout mesoscutum, occipital flange broad, pronotal cervical area separated from lateral pronotal areas by a ridge ( Figs 1, 4 ), and lateral pronotal area divided ventrally by broad groove ( Fig. 17 ). The new species is most similar to the Palaearctic Spilomicrus stigmaticalis Westwood but differs by the broad occipital flange (narrow in S. stigmaticalis ), notauli connected with transscutal line by groove ( Fig. 6 ), (not connected with transscutal line in S. stigmaticalis ), male A4 without projection at base and bare area near keel ( Fig. 9 ) (with projection at base and bare area near keel in S. stigmaticalis , Fig. 27 ). Differences between S. notaulus and S. nottoni sp. nov. are described in the key (see couple 3); differences between S. notaulus and S. lubomasneri are presented in the diagnosis of S. lubomasneri .

Description. Holotype. Female ( Figs 1–3, 6–8 ). Body length 4.1 mm; fore wing length 2.4 mm; antenna length 2.1 mm.

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

Head. Head in dorsal view subquadrate (30:29), narrower than width of mesosoma (54:62), with extremely prominent antennal shelf ( Fig. 1 ); in lateral view as long as high. Frons, face, genae and vertex with scattered setigerous punctures, which denser on face ( Fig. 3 ). Tentorial pit distinctly developed, not large. Malar sulcus rudimentary, very shallow. Clypeus transverse (18:13), semicircular, convex. Epistomal sulcus distinct. Ratio of pleurostomal distance to width of head 16:30 ( Fig. 3 ). Mandible long, bidentate with upper tooth shorter than lower tooth. Eye height shorter than half head height (11:24), and distinctly longer than malar space (15:9); eye with long setae and surrounded by semicircular groove. Ocelli large ( Fig. 1 ); LOL equal to diameter of anterior ocellus; POL longer than OOL (4:3). Occipital flange broad and smooth, with several long setae medially ( Fig. 1 ). Postgenal cushion dense ( Figs 3, 6 ).

Antenna. A1 cylindrical, densely covered with pale setae and its apical rim with two projecting lamellae overlapping base of A2. A2 compressed, in lateral view rectangular, elongate (6:4), in dorsal view tapering at base. Antenna with non-abrupt clava; A8-A13 with MGS brush and flattened on ventral side. In lateral view, connection between A8–A13 situated dorsally ( Figs 2, 7 ). A13 not narrower than A12 and with ventral pit. Ratios of length to width of antennomeres in dorsal view: A1 30:6; A2 10:5; A3 9:4.5; A4 7:4.5; A5 6:5; A6 6:5; A7 6:5; A8 6:6; A9 7:7.5; A10 7:8; A11 7:8; A12 6.5:8; A13 9:8.

Mesosoma. Mesosoma in lateral view longer than high (55:33); in dorsal view, longer than wide (55:35). Neck bare, with deep longitudinal grooves. Pronotum with median area separated by U-shaped ridges from lateral areas ( Fig. 1 ), lower part of lateral area pubescent and divided by horizontal grooves, and shoulders prominent and rounded ( Fig. 6 ). Pronotal cushion dense. Anterior incision of mesopleuron small. Propleuron smooth, with short, dense, silvery pubescence. Mesopleuron smooth, shining and bare laterally. Sternaulus present and extending from anterior incision of mesopleuron to posterior margin of mesopleuron. Mesopleuron above sternaulus with depression. Acetabular carina sharp, prominent and strongly shifted posteriorly in its medial part ( Fig. 26 ); postacetabular sulcus absent. Mesopleural epicoxal carina present only laterally. Mesopleural epicoxal sulcus and carina on ventral side not developed. Mesonotum as wide as long. Notauli complete, broad, deep posterior and shallow anteriorly. Humeral sulcus deep and broad. Scutellum flattened, with two large oval anterior scutellar pits (11:8). Axilla with grooves along posterior margin. Axillar depression pubescent. Lateral scutellar pits strongly enlarged, broad and long. Posterior scutellar pits large and deep ( Fig. 6 ). Metascutellum pubescent, with strongly projecting median keel and one lateral keel. Median propodeal keel projecting into long spine directed upward; propodeum entirely coarsely rugose, without dense pilosity. Propodeum with posterior margin in dorsal view arcuate ( Figs. 6, 8 ). Legs long and slender. Hind leg without delimited trochantellus.

Wings. Fore wings clear, longer than wide (61:25). Marginal vein elongate, 3.0 times as long as wide. Stigmal vein shorter than width of marginal vein. Costal and submarginal veins tubular, sclerotized. Basal vein nebulous.

Metasoma. Petiole cylindrical, elongate (24:11), with deep longitudinal grooves dorsally and pubescent on lateral and ventral sides, and, on dorsal side, on 2/3 of petiole length ( Fig. 8 ). Petiole length/mesosoma length 12:28. T2 with short sparse setae on posterior and lateral areas and with micropunctures posteromedially. T3–T5 each with dense punctation and with one row of long setae, the setae becoming denser on lateral part of tergites. T5 expanded laterally and covered with numerous short and long setae at sides. T6 small, T7 pointed. S2 smooth, with dense cushion at anterior margin; its posterior surface with scattered setae. S3–S5 with dense punctation and one row of long setae. Apical sternite covered with coarse and dense punctation, and coarse short setae apically.

Variation. Body length 2.1–4.5 mm. Head black to dark brown; mesosoma and petiole black to pale brown; metasoma dark brown to yellowish (but head and mesosoma always distinctly darker than metasoma), legs yellow to brown. Wing veins yellowish to dark brown. À4–À8 or À7–À8 or only À8 transverse. À2 equal to or longer than À3. Notauli with reticulation at bottom, rarely smooth. Suture separating trochantellus from femur partially visible in some specimens.

Male ( Figs 4–5, 9 ). Body length 2.4–4.8 mm. Similar to female, but differs in features of head, antennal structure and petiole. Antenna longer than body in small specimens and shorter in large specimens. Head in dorsal view more transverse than in female (30:38). Eye large, higher than half height of head (20:38). Antenna filiform, distal part of À1 and À2 yellow to brown, the following segments dark red to dark brown, very long and slender, with short dense silver setae ( Figs 5, 9 ). A2 and distal part of A1 reddish brown. A1with small lamellae projecting. A 2 in lateral view weakly transverse (9:10). A4 weakly excavated, with keel extending over basal half ( Fig. 9 ). Length to width of antennal segments: A1 23:5; A2 6:5; A3 19:5; A4 20:5; A5 17.5:5; A6 16:5; A7 15.5:5; A8 15:5; A9 15:5; A10 14:4.5; A11 13:4.5; A12 13:4; A13 17:4. Pronotum with border of cervical area smoother than in female. Stigmal vein equal to or longer than width of marginal vein. Ratio of length of petiole and metasoma 14:35. T5 not expanded and without setae at sides. S3–S6 narrower than in female. Apical sternite with coarse punctation.

Host. Unknown.

Etymology. The name refers to the well develop notauli.

Type material. Holotype: ♀ ( ZISP) labelled “ RUSSIA, Primorskiy Terr., Khasan Region, Ryazanovka, 2– 3.IX.1987, S. Belokobylskij”, “ Holotype. Spilomicrus notaulus Chemyreva det. 2014”.

Paratypes. RUSSIA. Primorskiy Terr., same label as in holotype, (6♀, 3♂, ZISP); Southern Primore, 1992, A. Okulov (7♂, CNCI); near Spassk–Dal’niy, 19–23.VIII and 1–3.IX.1987, 10–22 and 25–27. VII.1991, 12. VII and 5– 7.VIII.1993, 1–10.VII.1995, 14–19.VIII and 4–6.IX.2001, S. Belokobylskij (41♀, 28♂, ZISP, CNCI, BMNH); near Anisimovka, 4.IX.1982, 10.VIII.1991 and 29.VIII.2001, S. Belokobylskij (2♀, 29♂, ZISP); same locality, 3.IX.1988, V. Tobias (1♀, 18♂, ZISP); near Chernigovka, 20.VII.1991, S. Belokobylskij (2♀, 5♂, ZISP); Merkushevka, 21.VII.1991, S. Belokobylskij (1♀, 1♂, ZISP); Ussuriyskiy Nature Reserve, 28–30.VIII.1982, V. Tobias (2♀, 13♂, ZISP); near Kamenushka, 9.IX.1987 and 31.VIII.1988, S. Belokobylskij (3♀, 16♂, ZISP); same locality, 25–27.VII.2010, E. Tselikh (5♀, 8♂, ZISP); Ussuriyskiy District, Gornotayozhnoye, 43 ᵒ 66 ′ N, 132 ᵒ 25 ′ E, 5– 7.ix.1999 and 19.v.1999, M. Michailovskaya (2♀, CNCI); same locality, 31.VII–5.VIII.1991 and 30.V.1990, S. Belokobylskij (9♀, 34♂, ZISP); same locality, 28.VI.1983, E. Budris (2♀, 1♂, ZISP); Laso Nature Reserve, 25– 26.VIII.2006, S. Belokobylskij (4♀, ZISP); near Artem, 30.VII.2001, S. Belokobylskij (2♀, 1♂, ZISP); Novokachalinsk, 11.VIII.2001, S. Belokobylskij (2♀, ZISP); near Vladivostok, 14.VII.1961, M. Kozlov (2♀, ZISP); same locality, 13.VIII.1993, S. Belokobylskij (2♀, ZISP); 30 km NE from Vladivostok, 29.vii–5.viii.1992, B. Gill (1♂, CNCI); Nezhino, 16–18.VII.1993, S. Belokobylskij (2♀, ZISP); near Nezhino, Zanadvorovka, 5.VI.1972, A. Ponomarenko (1♀, ZISP). SOUTH KOREA. Sobaek mountains, 35 ᵒ 50 ′ N, 126 ᵒ 0 0 ′ E, 23.VIII.1990, K. Yamagishi (2♂, CNCI). JAPAN. Honshu, Ibaraki Prefectum, Tsukuba, 1–20.V.1989 and 20.V–7.VI.1989, M. Sharkey, (2♀, CNCI); Hokkaido, Sapporo, 5–17.VIII.1989, M. Sharkey (1♂, CNCI); Hokkaido, Kamikava, 500m, 4.VII.1989, M. Sharkey (1♀, CNCI); Kyunshu, Fukuoka, Mt. Tachibana, 20.V–9.VI.1979, 15–21.VII.1979, 12– 18.VIII.1979 and 17.VIII.1992, K. Yamagishi (2♀, 19♂, CNCI); same locality, 12.VIII.1980, C. Yoshimoto (4♀, 1♂, CNCI); Miyazaki, Aya Teruha Bridge, 32 ᵒ 0 1 ′ N, 131 ᵒ 11 ′ E, L. Masner (1♀, CNCI).

Figures

FIGURES 1 – 9. Spilomicrus notaulus sp. nov., female (1 – 2, 6 – 9) and male (3 – 5). 1, 4, head, dorsal view; 2, 5, whole insect, lateral view; 3, face; 6, mesosoma, dorsal view; 7, whole antenna; 8, petiole, dorsal view; 9, antenna (A 2 – A 4); DP, pleurostomal distance; WH, width of head.

FIGURES 17 – 25. Spilomicrus lubomasneri sp. nov., female (17 – 20, 22 – 25) and male (21). 17, head, lateral view; mesosoma, dorsal view (18) and ventral view (25); 19, petiole, dorsal view; 20, whole insect, lateral view; 21, 22, whole antenna; 23, face; 24, head, frontal view.

FIGURES 26 – 28. Spilomicrus stigmaticalis Westwood, female (28) and male (26 – 27). 26, mesosoma, ventral view; 27 antennae (A 2 – A 5); 28, head, dorsal view.