Ishigakia duongi Pham, Ito, Matsumoto & van Achterberg

Pham, Nhi Thi, Ito, Masato, Matsumoto, Rikio & Achterberg, Kees Van, 2018, Two new species of the genus Ishigakia (Hymenoptera: Ichneumonidae, Acaenitinae) from Vietnam based on morphological and molecular evidence, Zootaxa 4442 (4), pp. 539-550: 545-548

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Ishigakia duongi Pham, Ito, Matsumoto & van Achterberg

sp. nov.

Ishigakia duongi Pham, Ito, Matsumoto & van Achterberg  , sp. nov.

( Figs. 4–6View FIGURE 4View FIGURE 5View FIGURE 6)

Material examined. Holotype: ♀ ( RMNHAbout RMNH), 15.v.2013, Lang Son Province, Mai Son, hand net, Tran Duc Duong   . Paratypes: 1 ♀ ( OMNHAbout OMNH), 14.v.2013, same locality and collector as holotype  ; [1 ♀ ( IEBR)], 28.v.2014, Cao Bang Province, Phia Oac NR, hand net, Hoang Vu Tru   ; Vinh Phuc Province, Tam Dao NP: 1 ♂ ( OMNHAbout OMNH), 500 m a.s.l, 30.v.1997, hand net, Arita et al.  ; 4 ♂ ( OMNHAbout OMNH), 500–1000 m a.s.l,–, hand net, R. Matsumoto   ; 2 ♂ ( IEBR), 900–1200 m a.s.l, 3–4.v.1998, hand net, R. Matsumoto.  

Description of holotype, habitus: Fig 4 View Figure , female, length of fore wing 17.2 mm. Head. Antenna with 37 flagellomeres, first flagellomere about 1.4× length of second; frons concave and polished medially, punctate laterally, dorsally with transverse wrinkles, carina between antennal sockets extending to upper margin of face; face 0.8× as high as wide, densely, coarsely punctate, and with transverse wrinkles, inner margin of eyes divergent ventrally; clypeus about 0.6× as high as wide, distinctly separated into basal and apical halves, basally raised, with shallow punctures basally, pubescent, apical half thin, impunctate, without lateral and median tubercles ( Fig. 5a View Figure ); exposed part of labrum about 0.4× as long as basal width; malar space equal to basal width of mandible; mandible transversely striate except apically, lower tooth slightly longer than upper one; diameter of lateral ocellus 0.7× ocellar-ocular distance; vertex densely punctate ( Fig. 5c View Figure ); occipital carina ventrally meeting hypostomal carina about 1.6× basal mandibular width from base of mandibular width.

Mesosoma. Epomia 1.3× as long as mandibular basal width; pronotum with strong striae at median groove, posterior corner densely and coarsely punctate, pubescent; mesoscutum elongate, 1.2× as long as wide at anterior level of tegulae, densely punctate, pubescent, convergence area of notauli with transverse wrinkles; scutellum convex in lateral view, densely and coarsely punctate, pubescent, lateral carina present basally; postscutellum convex in lateral view, densely punctate ( Fig. 5d View Figure ); mesopleuron densely coarsely punctate, pubescent, with row of vertical striae medially, epicnemial carina present on ventral 0.7 of mesopleuron, sternaulus weakly indicated anteriorly, posterior transverse carina of mesosternum present medially; metapleuron densely, coarsely punctate, submetapleural carina strongly developed on anterior 0.5 ( Fig. 5b View Figure ); pleural part of propodeum punctate with transverse striae below elongate spiracle, area externa densely striate-punctate, pubescent, area basalis large, longer than apical width, with small punctures, pubescent and laterally with striae attached to sinuous latero-median longitudinal carina, area dentipara with strongly transverse striae, area superomedia well defined, strongly pubescent, less striate than area dentipara, posterior transverse carina sinuous medially, area postero-externa smooth and glabrous with several oblique carinae medially ( Fig. 5e View Figure ); fore basitarsus 2.9× as long as second tarsomere; mid basitarsus 2.9× second tarsomere; hind leg long and slender, femur 5.0× as long as wide, 0.7× length of tibia, tarsus 0.9× tibial length, basitarsus 2.9× second tarsomere, fifth tarsomere 1.5× longer than third, 1.2× longer than second. Fore wing vein Rs&M distad of cu-a ( Fig. 5i View Figure ), vein 2 rs-m distad of 2 m-cu, distance between 2 rs-m and 2 m-cu slightly shorter than 2 rs-m, 2 m-cu with two closed bullae; hind wing with first abscissa of vein Cu 1 about 0.5× length of vein cu-a.

Metasoma. Tergites densely punctate, pubescent; first tergite 4.8× as long as its apical width, lateral longitudinal carina present basally ( Fig. 5h View Figure ); second tergite 0.4× as long as first tergite, 1.2× longer than third; first sternite without tubercle, but with long erect setae present on about 0.6 of sternite medially, apical margin of first sternite extending beyond level of spiracle ( Fig. 5f View Figure ); ovipositor long with small teeth on both lower and upper valve apically, ovipositor sheath 3.6× as long as hind tibia; subgenital plate 0.9× as long as second tergite, with rounded apex ( Fig. 5g View Figure ).

Colour. Reddish yellow except apical half of hind tibia and tarsus black, wings with apical margin infuscated. Antennal flagellum without a white band.

Variation. Female paratypes have 38 antennal flagellomeres. Female paratype from Cao Bang Province has the hind tibia less black, its fore wing length 19.2 mm, ovipositor sheath 3.8× as long as hind tibia. Female paratype from Lang Son Province has fore wing vein 2 rs-m distad of 2 m-cu about length of 2 rs-m.

Male. Similar to female except for indistinct epomia on pronotum, fore wing vein 2 rs-m distad of 2 m-cu about 0.8–1.3× length of 2 rs-m; first tergite about 4.8–5.3× as long as apical width.

Genitalia. Subgenital plate pentagonal with a basal angle obtuse ( Fig. 6a View Figure ). Paramere short, basal part strongly projected toward the base of subgenital plate ( Fig. 6b View Figure ). Aedeagus gently curved, its penis valve ca. 1.5× as long as basal apodeme ( Fig. 6c View Figure ).

Distribution. Vietnam: Lang Son, Cao Bang, and Vinh Phuc provinces.

Comparison. The new species can be recognized from its congeners by the elongate first tergite (about 5 times as long as apical width), the flat first sternite (without tubercle) with erect setae present on about 0.6 medially.

Etymology. The new species was named after Tran Duc Duong from Institute of Ecology and Biological Resources ( Vietnam) who collected the holotype and the female paratype from Lang Son Province.

The two new species can be inserted in the key to world species of Ishigakia  by Ito & Maeto (2016) as follows:

1’. Body heterogeneous in colour: head and mesosoma reddish yellow, metasoma tergite black with yellow marks; first sternite with broad and sharp tubercle [fore wing with two dark markings; fore wing vein 2 rs-m distad of 2 m-cu about 0.5 times as long as 2 rs-m; first tergite 1.8 times as long as apical width; ovipositor sheath about 2.8 times as long as hind tibia]. Vietnam.................................................................................... Ishiakia babeensis  sp. nov.

-. Body homogeneous in colour: black or yellowish brown; first sternite with round tubercle, or tubercle absent............. 1

1. Body black........................................................................................... 2

- Body yellowish brown................................................................................ 8’

8’. First tergite elongate, about 5 times as long as apical width; apical margin of first sternite extending beyond level of spiracle, without tubercle, erect setae present on about 0.6 of sternite medially. Vietnam........................ I. duongi  sp. nov.

- First tergite shorter, not more than 3.2 times as long as apical width; apical margin of first sternite not extending to level of spiracle, with tubercle, erect setae present at level of tubercle................................................... 8


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