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Sugamori Y.,Osaka Museum of Natural History | Sugamori Y.,Osaka City University
Palaeoworld | Year: 2011

The Ajima Formation of the Ultra-Tamba Terrane has been regarded as Mesozoic fore-arc sediments and is mainly distributed in the western part of the Sasayama area, southwest Japan. The formation consists mainly of clastic rocks with a small amount of basalt and hydrothermal chert, and tectonically overlies the Middle Triassic Kamitaki Formation. The Ajima Formation is previously considered as Mesozoic or Late Jurassic, the newly discovered radiolarian fauna from the siliceous mudstone intercalated with sandstone and siltstone of the formation, however, corresponds to the upper part of the Neoalbaillella ornithoformis assemblage zone and the Albaillella levis abundance zone (early Changhsingian). Although the Ajima Formation and Ultra-Tamba Terrane in the Hokusetsu area are regarded as Late Jurassic fore-arc sediments (Inagawa Group of Ishiga, 1990a), unconformably overlying the Permian subduction-related accretionary complex, this study suggests that these strata tectonically overly the Triassic and Jurassic subduction-related accretionary complex of the Tamba Terrane or Middle Triassic formation, as Permian strata. Then the radiolarian fauna from the Ajima Formation implies that the highly abundant fauna of A. levis thrived not only in the central Panthalassa but also in the western margin of the Panthalassa. © 2011 Elsevier Ltd and Nanjing Institute of Geology and Palaeontology, CAS.


Sugihara Y.,Nagasaki Prefectural Institute of Fisheries | Yamada T.,Nagasaki Prefectural Institute of Fisheries | Tamaki A.,Nagasaki University | Yamanishi R.,Osaka Museum of Natural History | Kanai K.,Nagasaki University
Parasitology International | Year: 2014

We found aporocotylid larval stages (sporocysts and cercariae) from five individuals of terebellid polychaete Terebella sp., which were collected from seabed substrate and ropes and floats attached to tuna cages in a tuna farm on the coast of Tsushima Island, Nagasaki, Japan. Nucleotide sequences of the regions of internal transcribed spacer 2 ribosomal DNA and 28S ribosomal DNA from these larval stages were 100% identical to those of Cardicola opisthorchis registered in GenBank. C. opisthorchis is a pathogen causing blood fluke infection of Pacific bluefin tuna Thunnus orientalis, which is considered to have a significant impact on the Japanese Pacific bluefin tuna aquaculture industry. This is the first description of the intermediate host of C. opisthorchis. This indicates that the life cycle of C. opisthorchis is completed within tuna farms in this area. © 2013 Elsevier Ireland Ltd.


Matsumoto R.,Osaka Museum of Natural History | Broad G.R.,Natural History Museum in London
Journal of Hymenoptera Research | Year: 2011

Two new species of the genus Rodrigama Gauld are described: R. gauldi sp. n. from Ryukyus, Japan and R. takakuwai sp. n. from Taiwan. The genus Rodrigama was known from a single Costa Rican species and these new species are the first representatives of the genus in the Old World. The distribution of these species in the Palaearctic/Oriental Region reinforces the hypothesis that the Poemeniinae originated in the north temperate region and diversified into tropical regions, and that the Costa Rican R. gamezi is a relict of a group that once had a wider distribution. A key to the species of the genus is provided.


Five species of the family Cyproideidae (Crustacea: Amphipoda) are described from shallow sea in Japan. Cyproidea li-odactyla Hirayama, 1978 was collected from Kanagawa and Shizuoka Prefectures and Ariake Sea. Morphological char-acter of the antenna 1 in these specimens is different from the original description. Examining the paratypes of C. liodactyla, the shape of the antenna 1 in the holotype is revealed to be abnormal. Cyproidea okinawensis sp. nov. was collected from Okinawa Island. Its morphological characters resemble C. liodactyla and C. robusta Ren, 2006; however, this new species is different from the former in the smaller eyes, the narrower coxa 5 and the coloration, and from the latter in the ovoid telson. Metacyproidea gen. nov. is established with M. makie sp. nov. from Hachijo Island in Tokyo Prefec-ture as its type species. This new genus resembles Cyproidea, especially in the peduncular article 2 of antenna 1 with a distinct distal tooth and the posterodorsal end of urosomites with a strong projection. However, Metacyproidea can be dis-tinguished from Cyproidea by the coalesced urosomites 2-3 and the antenna 1 with a 10-16-articulated flagellum. Mool-apheonoides acutifalcatus Kobayashi & Ishimaru, 2005 and Terepeltopes dolichorhunia Hirayama, 1983 were also collected from Wakayama and Fukui Prefectures and Kanagawa, Shizuoka and Yamaguchi Prefectures, respectively. A key to species of the family Cyproideidae in Japan is provided. Copyright © 2016 Magnolia Press.


Takasuka K.,Ehime University | Matsumoto R.,Osaka Museum of Natural History
Journal of Ethology | Year: 2011

Unique host enticing behaviour has been observed for the first time in Zatypota albicoxa (Walker), which parasitizes the house spider, Parasteatoda tepidariorum (Koch), which weaves irregular, three-dimensional webs. One female wasp lay on her dorsum on the floor and grasped one of the vertical gumfoot threads with her legs (reclining-style). The wasp picked the thread with her legs, feigning a captured and struggling prey. Although this behaviour seems to be a variety of the ambush style, it is quite similar to that of a wandering and captured wingless insect, and it seems an adaptation to the host being hidden in a complex web. As the wasp touched the gumfoot directly, this suggests the possession of behavioural or morphological mechanisms for avoiding entrapment by the sticky masses on the web. Diversity in mode of attack correlates with the fact that the spider constructs webs of various forms in a variety of situations. Digital video images relating to the article are available at http://www.momo-p.com/showdetail-e.php?movieid=momo100416za03a, http://www.momo-p.com/showdetail-e.php?movieid=momo100416za03a, http://www.momo-p.com/showdetail-e.php?movieid=momo100415za01a, http://www.momo-p.com/showdetail-e.php?movieid=momo100415za01a, http://www.momo-p.com/showdetail-e.php?movieid=momo100416za01a, http://www.momo-p.com/showdetail-e.php?movieid=momo100416za01a, and http://www.momo-p.com/showdetail-e.php?movieid=momo100416za02a, http://www.momo-p.com/showdetail-e.php?movieid=momo100416za02a. © 2011 Japan Ethological Society and Springer.


Takasuka K.,Ehime University | Matsumoto R.,Osaka Museum of Natural History
Naturwissenschaften | Year: 2011

When encountering an already parasitized host, a parasitoid's optimal choices (superparasitism, host rejection, host feeding or infanticide) seem to depend on the individual species' life history, because the same choice may have different fitness consequences. We demonstrate infanticide under laboratory conditions by a polysphinctine, Zatypota albicoxa, which is a solitary koinobiont ectoparasitoid of spiders. The female always removed any previously attached egg or larva from the body of the host spider, Parasteatoda tepidariorum, with a rubbing behaviour. She rubbed her ovipositor back and forth toward the undersurface of the attached egg or of the saddle under the attached larva to pry it off and laid an egg after removal. When removing a larva, the infanticidal female engaged exclusively in unfastening the 'saddle' which fastens the larva to the body of the spider. All larvae were removed with the 'saddle' attached to the ventral surface of the body. The female invested more time to remove the medium second and the large penultimate instar larvae than to remove eggs and first instar larvae because of the labour involved in unfastening the saddle. Oviposition with infanticide of the medium second and the penultimate instar larvae imposed more time upon the female than that on an unparasitized host. Removal of any previous occupant in spite of the associated labour costs suggests that infanticide will always be adaptive, no matter the time costs to Z. albicoxa, because so much is invested in attacking the host and because the parasitoid cannot detect whether the spider is already parasitized until she achieves subjugation. © 2011 Springer-Verlag.


Two new species of eyeless amphipods are described from coastal Japan. Dulzura projecta sp. nov. (Hadziidae) was collected under large stones and in coarse sand from Osaka to Mie Prefectures. Dulzura projecta can be distinguished from the other Dulzura species by the distinct projection on article 1 of the male pleopod 3 inner ramus and the very long carpus of male gnathopod 1. Paraniphargus shiosai sp. nov. (Melitidae) was collected in coarse sand from Mie Prefecture, and can be differentiated from the other two species in the genus by the dorsal teeth on the pleonites, the smaller coxa 4 with shallow excavation and the shorter antenna 1 flagellum. Paraniphargus is reinstated as a distinct genus, following observation of the gnathopods, which revealed sexual monomorphism between males and females. © 2016 Informa UK Limited, trading as Taylor & Francis Group


The Mutual Climatic Range method of Paleotemperature reconstruction is well suited to Japan, because the meteorological stations are densely located, and the modern distributions of beetles are well studied. Many of the cold adapted species which were in the Japanese lowlands during glacial periods still survive at higher elevations on the Japanese Archipelago, in high mountain refuges. A new way of drawing convex polygons as species envelopes is proposed here, make the method more accurate and objective. A test analysis using four beetle species from a stratum in the Nojiri-ko site, Nagano Prefecture is presented. The test shows a decline of temperatures, the first example of MCR from East Asia. The result agrees with the previous estimation based on modern range overlaps and on reconstructions based on vegetation. © 2013 Elsevier Ltd and INQUA.


Three new species of the Eriopisa group (Crustacea: Amphipoda: Eriopisidae) are described from coastal areas in Japan. Paraflagitopisa gen. nov. is established with P. excavata sp. nov. as its type species. This new genus is characterized by (1) entire lateral cephalic lobe, (2) unfused flagellum of antenna 2, (3) 3-articulated mandibular palp, (4) carpus of gna-thopod 1 longer than propodus, (5) transverse palm of gnathopod 1, and (6) slender outer ramus of uropod 3 with long second article, and can be distinguished from the closely related genus, Flagitopisa, by the article 2 of mandibular palp longer than article 3, the undilated bases of pereopods 3-4, and the slender inner ramus of uropod 3. Psammogammarus lobatus sp. nov. is characterized by (1) male gnathopod 2 with excavated palm, (2) posterodistally projected bases of pe-reopods 5-7, (3) quadrate posteroventral corner of pleonal epimeron 3, (4) short inner ramus of uropod 3, and (5) article 2 of uropod 3 outer ramus longer than article 1. Victoriopisa wadai sp. nov. has the following characters: (1) eyes absent, (2) peduncle of antenna 1 not heavily setose, (3) accessory flagellum with 1-2 articles, (4) flagellum of antenna 2 com-posed of 2 long and 3 short articles, (5) gnathopod 2 in both sexes with excavated palm, (6) merus of pereopod 7 moder-ately expanded, and (7) ventral margin of pleonite 2 slightly setose. Key to species of the Eriopisa group in Japan is provided. Copyright © 2015 Magnolia Press.


Japanese species of the genus Zatypota are revised and a total of twelve species are recognized. Nine of them, Z. baragi sp. nov., Z. brachycera sp. nov., Z. chryssophaga sp. nov., Z. dendrobia sp. nov., Z. elegans sp. nov., Z. maculata sp. nov., Z. sulcata sp. nov., Z. takayu sp. nov. and Z. yambar sp. nov., are new to science and one, Z. percontatoria, is newly recorded from Japan. Host records are given for ten species including seven new and one newly recorded species based on reared materials. Each species utilizes different spider species as hosts. All host spiders belong to Theridiidae (nine species) and Linyphiidae (Z. sulcata). A key to Japanese species is provided and notes on their biology are given. © 2010 Magnolia Press.

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