The genus Syntretus Foerster of the subfamily Euphorinae contains two subgenera ExoSyntretusBelokobylskij, 1998 and SyntretusFoerster, 1862 (Achterberg and Haeselbarth, 2003). The subgenus ExoSyntretus Belokobylskij is distributed in Palaearctic (Achterberg and Haeselbarth, 2003) and Oriental (Papp, 2006) regions. The species of the genus Syntretus are small parasitic wasps, which attack hymenopterous adults such as parasitoid wasps and bees. Their biology has been studied by Cole (1959) and Alford (1968).
The subgenus ExoSyntretus are known as only five species in the world (Yu et al., 2012 and Papp, 2006). The species in Korea was studied by Papp (1992) and Ku et al. (2001). Syntretus (ExoSyntretus) elabsus (Papp) was described from North Korea by Papp (1992), and then reported from South Korea by Ku et al. (2001). Two species of this subgenus from Korea are recognized in this paper, and among them, Syntretus (ExoSyntretus) nevelskoii Belokobylskij, is the first record in Korea.
In this study, we describe its diagnostic characters, and also provide world checklist, distribution and host information. All examined materials are deposited in the Science Museum of Natural Enemies (SMNE), Geochang, Republic of Korea. Terminology used in this paper follows van Achterberg (1993).
Systematic accounts
Family Braconidae Nees, 1811 Subfamily Euphorinae Foerster, 1862
Genus SyntretusFoerster, 1862
SyntretusFoerster, 1862: 251. Type species: Microctonus vernalis Wesmael, 1835.
FalcoSyntretusTobias, 1965: 843. (Syn. by Achterberg et Haeselbarth, 2003).
ParaSyntretusBelokobyskij, 1993: 60. (Syn. by Achterberg et Haeselbarth, 2003).
ExoSyntretusBelokobylskij, 1998: 12. (Syn. by Achterberg et Haeselbarth, 2003).
Subgenus ExoSyntretusBelokobylskij, 1998
ExoSyntretusBelokobylskij, 1998: 12. (Stat. rev. by Achterberg et Haeselbarth, 2003).
Type species: Syntretus nevelskoiiBelokobylskij, 1996: 283.
Syntretus (ExoSyntretus) elabsus (Papp, 1992)
FalcoSyntretus elabsusPapp, 1992: 69. TL: Gaeseong, North Korea.
ExoSyntretus elabsus: Belokobylskij, 1998: 14; Belokobylskij, 2000: 391; Ku et al., 2001: 114, Taebaek, South Korea; Ku, 2010: 181.
Syntretus (ExoSyntretus) elabsus: Belokobylskij et al., 2012: 364.
Diagnosis: ♀. Body length 2.3-3.0 mm, antenna with 18 segments; 3rd antennal segment equal to or slightly longer than 4th one, propodeum with pointed anteriorly pentagonal areola and one longitudinal carina before it; claws large, ovipositor more or less curved and with subapical tooth dorsally, body yellow, veins and pterostigma yellow.
Material examined: Korea, 2♀ (SMNE): 1♀, Suwon, Gyeonggi, 15. VI. 1994, Deok-Seo Ku; 1♀, Forestry research station, Hongneung, Seoul, 3. X. 1998 (LT), Seung-Ho Gang.
Distribution: Korea, Japan, Russia (Primorski krai).
Host: Unknown.
Remarks: This species was first described from North Korea by Papp (1992).
Syntretus (ExoSyntretus) nevelskoiiBelokobylskij, 1996 (Fig. 1)
Syntretus nevelskoiiBelokobylskij, 1996: 283.
ExoSyntretus nevelskoii: Belokobylskij, 1998: 14; Belokobylskij, 2000: 391.
Syntretus (ExoSyntretus) nevelskoii: Belokobylskij et al., 2012: 364.
Diagnosis: ♀. Body length 1.6-1.8 mm, antenna with 15-16 segments; 3rd antennal segment 0.9 times as long as 4th one; propodeum with obtuse anteriorly pentagonal areola and two longitudinal carinae before it; claws small; ovipositor straight and without subapical tooth dorsally; body reddish brown, pterostigma brown medially, yellow basally and apically.
Material examined: Korea, 3♀ (SMNE): 1♀, Pyongji, Dongbu, Geoje, Gyeongnam, 4-5. VI. 1997 (LT), Deok-Seo Ku; 1♀, Forestry experimental station, Gwangneung, Gyeonggi, 27. VII. 1998 (LT), Yeong-Mi Park; 1♀, Seokbyeongsa, Hwacheon, Imgye, Jeongseon, Gangwondo, 2. VIII. 2002 (LT), D-S Ku.
Distribution: Korea, Russia (Khabarovsk krai, Primorski krai).
Host: Unknown.
Remarks: This species is recorded for the first time from Korea.
World Checklist of the Subgenus ExoSyntretus, Belokobylskij, 1998Syntretus (ExoSyntretus) choui (Papp, 2006): Taiwan.
Syntretus (ExoSyntretus) elabsus (Papp, 1992): Korea, Japan, Russia (Primorski krai).
Syntretus (ExoSyntretus) minimusAchterberg et Haeselbarth, 2003: Germany.
Syntretus (ExoSyntretus) nevelskoiiBelokobylskij, 1996: Korea (new record), Russia (RFE).
Syntretus (ExoSyntretus) shawiAchterberg et Haeselbarth, 2003: France.