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Featured researches published by Kazuhiko Konishi.
Entomological Science | 2007
Rikio Matsumoto; Kazuhiko Konishi
In Japan, two species of the genus Reclinervellus were found to attack a single host spider, Cyclosa octotuberculata (Araneae). One of these, Reclinervellus tuberculatus comb. nov., winters as a tender larva and has at least two generations a year. This species laid its egg on the anterior face of the hosts abdomen. Prior to laying an egg the female repeatedly rubbed her ovipositor over the dorsal and lateral surfaces of the hosts abdomen near the base for more than 25 min. The hatched larva fixed itself at the position where the egg was laid, and developed by consuming the hosts body fluids. The other species, R. masumotoi sp. nov., is closely related to R. tuberculatus but is easily distinguished from it by having a very weakly reclivous Cu vein in the hindwing, a less developed carina of the propodeum, a shorter ovipositor and more blackish coloration of the mesoscutum. Although this species is sympatric with R. tuberculatus and attacks the same host, the position of the egg and larva on the hosts body is quite different from that of R. tuberculatus. The egg of this species was laid on the posterior surface of the hosts abdomen and the larva matured 10–20 days earlier than those of R. tuberculatus. Via these modes of parasitism R. masumotoi seemed to escape from competition with R. tuberculatus at the stage of oviposition and out‐competed it when a single host individual bore larvae of both species. Previous records of parasitoids reared from C. octotuberculata were reviewed and found to include records of both species.
Entomological Science | 2004
Kazuhiko Konishi; T. C. Narendran; Taro Imamura; Porntip Visarathanonth
Five species of Chalcididae (Hymenoptera) were collected from rice stores in Thailand. Proconura minusa Narendran was dominant and is thought to be an important parasitoid of Sitotroga cerealella (Olivier). Many individuals of Proconura caryobori (Hanna) were collected, and the host in rice stores of this species was Corcyra cephalonica (Stainton). Antrocephalus mitys (Walker) is known to parasitize C. cephalonica, but few individuals were collected; therefore, it is thought not to be important in Thailand. Notaspidiella clavata Narendran and Konishi sp. nov. and Notaspidium thailandicum Narendran and Konishi sp. nov. are described.
Entomological Science | 2007
Toshiharu Mita; Kazuhiko Konishi; Mamoru Terayama; Seiki Yamane
The family Megalyridae is recorded from Japan for the first time on the basis of two new species, Carminator helios and C. japonicus. This is the northernmost record of living Megalyridae, although fossil species are known from regions of the Baltic Sea. Carminator helios can be distinguished from congeners of the Asian and Australian regions by the combination of a long head, deeply excavated frons with convex inner margins, entirely striated postgena, the number of fore tibial spines (more than 16), and a long R1 vein. Carminator japonicus is distinguishable from other species by the combination of an orange‐colored metasoma, a weakly excavated frons, and an elongate vertex. This species was collected from the canopy of Acer pictum. Additional characters that distinguish species of the genus Carminator are discussed.
Journal of Pest Science | 2013
Shun Ichiro Takano; Atsushi Mochizuki; Keiji Takasu; Kazuhiko Konishi; Jelfina C. Alouw; Donata S. Pandin; Satoshi Nakamura
Brontispa longissima (Coleoptera: Chrysomelidae) is a serious invasive pest of coconut palm (Cocos nucifera) supposedly originating from Indonesia and New Guinea. It has recently invaded Southeast and East Asia, where it has caused serious damage to coconut plants. Brontispa longissima as currently defined contains two cryptic species: we herein referred to one as the “Asian clade”, which is distributed over a wide area, including Asia and the Pacific region; and we referred to the other one as the “Pacific clade”, which is found in a limited area in the Pacific region. We developed a PCR–RFLP method for differentiating the two clades. Digestion of the PCR product of a 1,014-bp region within the mitochondrial cytochrome oxidase I gene (COI) with BslI, HpyCH4III, or NlaIV resulted in clade-specific patterns as estimated by the sequence data. We applied the method to specimens newly obtained from various locations to investigate the geographical distribution of B. longissima. Although B. longissima collected from Samoa in April 2003 had been placed in the Pacific clade, specimens collected from the same island in April 2010 were placed in the Asian clade, suggesting that the predominant clade may have been changing from the former to the latter. On Timor, specimens included both clades in apparently segregated habitats.
Entomological Science | 2013
Kazuyuki Kudô; Kazuma Komatsu; Kazuhiko Konishi; Sidnei Mateus; Ronaldo Zucchi; Fabio S. Nascimento
Although most polistine wasp species are found in the Neotropical region, mainly in Brazil, only a very limited number of South American parasitoids or parasites are known to exist. We assessed the frequency of a hymenopterous parasitoid, Pachysomoides sp. (Ichneumonidae, Cryptinae), in the nests of the Brazilian independent‐founding wasp Polistes satan and compared the rates of the parasitization of P. satan by Pachysomoides sp. between the dry (winter) and wet (summer) seasons. Pachysomoides sp. larvae were seen to feed on P. satan pupa and were found in both the upper and lower parts of the host pupal cell (ca. 10 individuals in each host pupal cell). Approximately one‐third of the pupal cells in the P. satan colonies were parasitized in the dry season, whereas there were no parasitized pupal cells in the wet season. Consequently, the rates of parasitization by Pachysomoides sp. were significantly greater during the dry season than during the wet season due to unknown reasons.
Annals of The Entomological Society of America | 2014
Yoshihisa Abe; Tatsuya Ide; Kazuhiko Konishi; Takatoshi Ueno
ABSTRACT Plagiotrochus indochinensis Abe, Ide, Konishi, & Ueno sp. nov., Dryocosmus okajimai Abe, Ide, Konishi, & Ueno sp. nov., and Synophrus vietnamensis Abe, Ide, Konishi, & Ueno sp. nov. are described from Vietnam. This is the first record of Cynipidae (Hymenoptera: Cynipoidea) from the Indochina region; the former two species belong to tribe Cynipini and the latter to the inquiline tribe Synergini. Based on the observation of a female P. indochinensis inserting its ovipositor into a young sprout of Quercus (Cyclobalanopsis) helferiana A. de Candolle in the field, this wasp species is considered to induce galls on this evergreen oak species. This article confirms that members of Cynipini that induce galls on Cyclobalanopsis (the ring cup oaks) are widely distributed in Asia, as predicted previously. Although D. okajimai was collected by sweeping an evergreen Fagaceae tree, its host remains to be clarified. Because the adults of S. vietnamensis were collected by sweeping an evergreen Fagaceae tree in June and dissecting a bud gall on Castanopsis sp. in September, it is considered that this wasp species has more than one generation a year. The gall-inducing ability and host plant specificity of S. vietnamensis should be examined carefully in future. The high species richness of Quercus L. and related genera in the Indochina region increases the likelihood of the existence of little-known, but potentially diverse, cynipid fauna in this region.
Systematic Entomology | 2011
Toshiharu Mita; Kazuhiko Konishi
Carminator Shaw is a small genus of parasitic wasps that is mainly distributed in Southeast Asia. Eight species are recognized here, including Carminator coronatussp.n. and Carminator gracilissp.n. A data set comprising 54 morphological characters and including all the known species of Carminator, as well as four out‐group taxa (two Cryptalyra spp., one Ettchellsia sp. and one Megalyra sp.), was assembled and analysed. Carminator is retrieved as monophyletic. All weighted analyses place Carminator affinis as the sister group to the rest of the genus. A northern clade comprising species occurring on the Japanese Isles, Taiwan and Vietnam (Carminator japonicus (Carminator gracilissp.n. (Carminator cavus + Carminator helios))) is strongly supported and nested inside the more southerly distributed species. C. helios is found on Nakanoshima Island, which emerged post‐Pliocene, and so C. helios is considered to have dispersed there via a land‐bridge connection from the Ryukyu Islands. A key to all known species of Carminator is provided.
Entomological Science | 2010
Kazuhiko Konishi
The lectotype of Amebachia baibarana Uchida, 1928, which is the type species of Amebachia Uchida, was re‐examined. Though this species was synonymized with Netelia (Netelia) laevis (= Paniscus laevis Cameron, 1905) and Amebachia has been synonymized under the subgenus Netelia of the genus Netelia, it is concluded that A. baibarana is a distinct species from N. laevis and Amebachia should be a subgenus of the genus Netelia. Netelia laevis is transferred from the subgenus Netelia to Apatagium. Four new species of Netelia (Amebachia), N. (A.) yoshimatsui sp. nov., N. (A.) rasilella sp. nov., N. (A.) fulvistigma sp. nov., and N. (A.) vicinalis sp. nov. are described from Japan, and a key to the species of this subgenus is provided.
Entomological Science | 2012
Yoshihisa Abe; Kazuhiko Konishi
The parasitoid Gronotoma adachiae is reported from Vietnam for the first time. The vegetable leaf miner Liriomyza sativae (Diptera: Agromyzidae) is a new host record. The G. adachiae specimens collected in Yunnan Province are the second record of this parasitoid from China.
Entomological Science | 2008
Takuma Yoshida; Kazuhiko Konishi
Japanese species of the genus Dichrogaster are revised. Four species are recognized. Two species, D. imperialis n. sp. and D. parva n. sp., are described. Dichrogaster liostylus (Thomson) and D. kichijoi (Uchida) are redescribed. A key to the Japanese species is provided.