Dacnusa (Agonia) adducta ( Haliday, 1839 )

Zheng, Min-Lin & Chen, Jia-Hua, 2017, A new species and three newly recorded species of the dacnusine genus Dacnusa Haliday (Hymenoptera: Braconidae: Alysiinae) from China, Zootaxa 4232 (4), pp. 511-522 : 514-516

Dacnusa (Agonia) adducta ( Haliday, 1839)

(Fig. B)

Alysia (Dacnusa) adducta Haliday, 1839: 13 .

Dacnusa adducta: Marshall, 1895 , 5: 461, 1897:1; Dalla Torre, 1898, 4: 23; Graeffe, 1908, 24: 156; Nixon, 1937, 4: 48; Tobias, 1962, 31: 36; Griffiths, (1966) 1967, 16(7/8): 895; Griffiths,1968, 18(1/2): 22; Shenefelt, 1974: 1083.

Agonia adducta: Förster, 1862 , 19: 274; Kirchner, 1867: 139; Telenga, 1935, 1934 (12): 114; Nixon, 1954, 90: 278; Fischer, 1962, 14(2): 36; Tobias, 1962, 31: 136; van Achterberg, 1997: 12; Quicke et al., 1997, 26(1): 25; Papp, 2003, 49(2): 127; Papp,2005, 66: 145; Papp, 2007, 53(1): 7.

Dacnusa (Agonia) adducta: Thomson, 1895 , 20: 2320; Tobias et Jakimavicius, 1986: 7 –231; Tobias, 1998: 324; Yu et al., 2012: DVD

Material examined. 1 male, Migang peak, Liupan mountain, Ningxia Province, China, 22.viii.2001, coll. Zhihui Lin.

FIGURE B (1–9) Dacnusa (Agonia) adducta (Haliday) , rec. nov., Ƌ, 1. head (frontal view); 2. head (dorsal view); 3. mandible; 4. fore wing; 5. mesosoma (lateral aspect); 6. first tergite (dorsal aspect); 7. mesosoma (dorsal aspect); 8. antenna (scapus, pedicellus, 1st–3rd flagellomeres); 9. hind tibia and tarsus.

Description. Male. Body 1.8 mm long.

Head. Antenna with 29 flagellomeres, first flagellomere 1.2 and 1.4 times as long as second and third flagellomere, respectively, first and penultimate flagellomeres 4.5 and 2.8 times as long as wide, respectively; in dorsal view, head 1.9 times as broad as long; eye as long as temple; OOL: OD: POL= 12:2:7; face almost smooth, sparsely setose; mandible (Fig. B3) with 3 teeth, middle tooth equilateral triangle and pointed.

Mesosoma. Mesosoma 1.2 times as long as wide; sides of pronotum glabrous; mesoscutum densely pubescent; notauli nearly invisible; mesopleuron smooth and glabrous; precoxal sulcus absent (Fig. B5); propodeum and metapleuron densely pubescent.

Wings. Vein r of fore wing absent, the joint of vein 2-SR and 3-SR+SR1 completely merge into the pterostigma (Fig. B4); pterostigma 6.0 times as long as wide, 0.9 time as long as vein 1-R1.

Legs. Hind femur 5.0 times as long as broad distally; hind tibia 1.25 times as long as hind tarsus; second tarsomere of hind tarsus 0.5 times as long as its basitarsus.

Metasoma. First tergite (Fig. B6) slightly widened towards its apex, hairless, longitudinally striated, 1.8 times as long as its apical width, and strongly protrude on where spiracles located; remaining tergites smooth and slightly setose.

Colour. Head mainly dark reddish-brown; antenna chestnut brown except ventral part of scapus and pedicellus yellow; mandible yellow except teeth reddish-brown; labrum yellow, maxillary and labial palp pale yellow; clypeus brown. Mesosoma dark reddish-brown; legs yellow except telotarsus yellowish-brown. First tergite dark reddish-brown; remaining tergites of metasoma yellowish-brown to dark brown, posteriorly.

Female. Unknown in this study, but according to Nixon (1954) and Griffiths (1968), pterostigma of fore wing is distinctly wider and darker in male than female, and the joint of vein 2-SR and 3-SR+SR1 merge into the pterostigma only one point (see Figure 174 in Griffiths 1968, and compare with Fig. B 4 in this paper).

Biology: Known as the endoparasitoids of two species in Agromyzidae : Cerodontha pygmaea (Meigen) and Liriomyza flaveola (Fallen) (Yu et al. 2012) .

Distribution. China (Northwest Palaearctic, first record), Austria, Azerbaijan, Bulgaria, Czech, Slovakia, Germany, Hungary, Italy, Spain, Poland, Denmark, Sweden, Switzerland, Ireland, United Kingdom, Yugoslavia, Ukraine, Russia, Korea.

Remarks. Agonia was described as a subgenus of Dacnusa by Tobias (1986) with a unique character “vein r of fore wing absent and basal part of vein 3-SR+SR1 of fore wing lined along pterostigma”. Dacnusa (Agonia) adducta is still the only species in Agonia although it is very widely distributed.