Scientific Note Notes on Apanteles Javensis Rohwer
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THE PAN-PACIFIC ENTOMOLOGIST 82(3):000–000, (2006) Scientific Note Notes on Apanteles javensis Rohwer (Hymenoptera: Braconidae: Microgastrinae) in Japan, including new distribution and host records Apanteles javensis Rohwer, 1918 was originally described from 24 specimens reared from larval Pelopidas conjuncta (Herrich-Scha¨ffer 1869). The host was collected at Bogor (5 Buitenzorg), Java, Indonesia. Wilkinson (1928) redescribed A. javensis using six additional specimens reared from P. conjuncta collected at the type locality. Nixon (1965) expanded the distribution of A. javensis to include Sri Lanka and Thailand and reported an additional hesperiid, Pelopidas mathias (Fabricius 1758), as a new host. Nixon (1965) also provided a redescription of A. javensis. Subba Rao et al. (1965) indicated that A. javensis was reared from groundnut leaf miner, Stomopteryx nerteria (Meyrick 1906), in India. However, this and other records from non–hesperiid hosts should be confirmed. Additionally, A. javensis has been recorded from southern China (Sichuan, Guangxi) (You et al. 1988). There have been records concerning parasitism of P. mathias by Apanteles sp. from Punjab, India (Chhabra & Singh 1978), Shiga and Nara Prefectures, central Japan (Nakasuji et al. 1981), and an unspecified locality in Japan (Masuzawa et al. 1983, Fukuda et al. 1984). We recently reared A. javensis from two species of Hesperiidae, P. mathias and Polytremis pellucida (Murray 1875), collected at rice cultivation areas in central Japan. In this paper we confirm the presence of A. javensis in Japan and present P. pellucida as a new host record. We made collections of larval hesperiids, including P. mathias, P. pellucida and Parnara guttata (Bremer & Grey 1985), in Osaka and Wakayama Prefectures from March 1998 to September 2005. Over 880 specimens of A. javensis were obtained from 43 early to final instar P. mathias larvae collected at two sites each in both Prefectures. Eighteen specimens were reared from one final instar P. pellucida larva collected in Osaka Prefecture (Table 1). In addition to rice, Oryza sativa Linnaeus (Gramineae), P. mathias larvae were found on cogon grass, Imperata cylindrica (Linnaeus) Raeusch (Gramineae), dwarf bamboo, Pleioblastus chino (Franchet & Savatier) Makino (Gramineae), and eulalia grass, Miscanthus sinensis Andersson (Gramineae). Polytremis pellucida was collected on dwarf bamboo. Larvae of A. javensis emerged from final instar P. mathias larvae and made a cluster of cocoons alongside the host immediately after emergence. Each cocoon cluster consisted of 5 to 62 individual cocoons that were oval in shape, approximately 3 mm in length, and silky white in color. Adult parasitoids emerged 8 to 10 days after cocooning in a 25uC, 16L:8D condition. The reared specimens fit the redescription of A. javensis in Wilkinson (1928) and Nixon (1965) except that sculpture on metasomal tergite 1 was punctate with some rugosity in the apical half rather than highly polished as described in Nixon (1965). Almost all the specimens of A. javensis shown in Table 1 are deposited in the collection of the Entomological Laboratory, Osaka Prefecture University, Sakai, Osaka. Pelopidas mathias is multivoltine and overwinters as diapausing larvae (Ishii 1980, Masuzawa et al. 1983, Fukuda et al. 1984). Apanteles javensis was obtained from P. mathias larvae of the overwintering generation in winter and spring, as well as larvae The Pan-Pacific Entomologist panp-82-03-10.3d 31/8/06 10:54:39 77 0 THE PAN-PACIFIC ENTOMOLOGIST Vol. 82(3) The Pan-Pacific Entomologist panp-82-03-10.3d Table 1. Site, month, plant and stage in/on which Pelopidas mathias and Polytremis pellucida larvae parasitized by Apanteles javensis were collected in central Japan from March 1998 to August 2005, and number of parasitoid individuals emereging from the host larvae. Site of collection No. of host No. of host Stage of parasitized host larva Plants on which Altitude larvae larvae at collection (No. of A. javensis parasitized hosts Host Prefecture City or Town Site (m) Year Month collected parasitized egressing from each host)1 were found Pelopidas Osaka Sakai Gakuencho 30 1998 Mar 35 3 Late (5, 10, 24) I. cylindrica mathias Hachiga- 60 Apr 25 4 Final (12, 14, 17, 20) I. cylindrica mineji Wakayama Kamitonda Ikuma 20 June 24 1 Final (*) I. cylindrica Wakayama Hikigawa Hiki 80 July 15 2 Middle (7, 38) O. sativa Osaka Sakai Hachiga- 60 July 11 4 Late (28), O. sativa mineji Final (12, 18, 23) 2002 Aug 3 2 Final (8, *) I. cylindrica Oct 13 3 Middle (18, *, *) I. cylindrica Nov 12 1 Middle (*) I. cylindrica Dec 5 1 Middle (*) I. cylindrica 2003 Apr 23 3 Late (44), I. cylindrica, 31/8/06 10:54:53 78 Final (18, 34) P. chino Oct 39 3 Early (*), Final (*, *) I. cylindrica 2004 Apr 32 1 Late (*) I. cylindrica 2005 Mar 10 1 Early (27) I. cylindrica, P. chino Apr 6 1 Middle (39) I. cylindrica, P. chino June 20 5 Late (23, 30, 35), I. cylindrica, Final (7, 37) M. sinensis July 8 6 Middle (28, 45), I. cylindrica Late (27, 33, 36), Final (45) Aug 2 1 Final (62) O. sativa Polytremis Osaka Sakai Hachiga- 60 2002 May 1 1 Final (18) P. chino pellucida mineji Total (for Pelopidas mathias) 285 43 1 The number of A. javensis cocoons. *: the number of cocoons was not recorded. 2006 SCIENTIFIC NOTE 0 of the summer generation. Therefore, A. javensis is also multivoltine and overwinters as larvae within the host body in Osaka and Wakayama Prefectures. Pelopidas mathias is distributed in the Indo–Australian region and southeast Asia, including Japan and Korea (Shiroˆzu 1960, Lewis 1973, Fleming 1975, Fukuda et al. 1984, Maruyama 1991, Fujioka et al. 1997). Pelopidas conjuncta occurs in southeast Asia, Sri Lanka and India (Shiroˆzu 1960, Lewis 1973, Fleming 1975, Maruyama 1991). Thus, P. mathias and P. conjuncta have overlapping distributions, but the former species is more broadly distributed than the latter. Polytremis pellucida is widely distribution over the Far East region, including Taiwan, Japan, Korea and eastern Russia (Shiroˆzu 1960, Lewis 1973, Fukuda et al. 1984, Fujioka et al. 1997). Thus, the distribution of A. javensis in the Indo–Australian and Far East regions may be broader than presently recorded (Java, Thailand, Sri Lanka, India, China and Japan). ACKNOWLEDGMENTS We would like to express our cordial thanks to Dr. Hideyuki Chiba of the Bishop Museum (Honolulu, HI) for his invaluable advice on the taxonomy of Hesperiidae. We are also indebted to Dr. Toshiya Hirowatari, Dr. Kazuhisa Tenma, Mr. Atsushi Abe and Mr. Kohichiro Takahashi of the Entomological Laboratory of Osaka Prefecture University for their kind help and advice. This research was supported by Grant–in–Aids from the Japan Ministry of Education, Culture, Sports, Science and Technology (nos. 15208007 and 15510193). Shuji Kuroda, Norio Hirai, Minoru Ishii. Entomological Laboratory, Graduate School of Agriculture and Biological Sciences, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan, and Kaoru Maeto, Laboratory of Insect Science, Faculty of Agriculture, Kobe University, Kobe, Hyogo 657-8501, Japan. Corresponding author, Minoru Ishii, [email protected] LITERATURE CITED Chhabra, K. S. & J. Singh. 1978. 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