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142 results for “Ogasawara Islands”
Fig. 6 in A Rare Flatfish, Samaris spinea (Teleostei: Pleuronectiformes: Samaridae) from the Ogasawara Islands, Japan, with Notes on Its Distribution, Taxonomy and Sexual Dimorphism
Fig. 6. Lateral view of head on blind side of Samaris spinea, NSMT-P 109872, 32.9 mm SL, showing a position of underlying parasitic isopod on the gill. Arrow head indicates cephalon.
Fig. 5 in A Rare Flatfish, Samaris spinea (Teleostei: Pleuronectiformes: Samaridae) from the Ogasawara Islands, Japan, with Notes on Its Distribution, Taxonomy and Sexual Dimorphism
Fig. 5. CT images of osteology of head and anterior body on ocular side in Samaris spinea, NSMT-P 109872, 32.9 mm SL. EC: epicentrum; HM: hypomeral.
Fig. 4 in A Rare Flatfish, Samaris spinea (Teleostei: Pleuronectiformes: Samaridae) from the Ogasawara Islands, Japan, with Notes on Its Distribution, Taxonomy and Sexual Dimorphism
Fig. 4. CT images of transformed scales with small spines along dorsal (A) and ventral (B) margins of caudal peduncle on ocular side of Samaris spinea, NSMT-P 109872, 32.9 mm SL.
Fig. 3 in A Rare Flatfish, Samaris spinea (Teleostei: Pleuronectiformes: Samaridae) from the Ogasawara Islands, Japan, with Notes on Its Distribution, Taxonomy and Sexual Dimorphism
Fig. 3. CT images of osteology on ocular (A) and blind (B) sides of Samaris spinea, NSMT-P 109872, 32.9 mm SL.
Fig. 2 in A Rare Flatfish, Samaris spinea (Teleostei: Pleuronectiformes: Samaridae) from the Ogasawara Islands, Japan, with Notes on Its Distribution, Taxonomy and Sexual Dimorphism
Fig. 2. Lateral view of ocular (A) and blind (B) sides of Samaris spinea, NSMT-P 109872, 32.9 mm SL, Ogasawara Islands, Japan.
Fig. 3. A–B in Crabs of the Families Tetraliidae, Trapeziidae and Xanthidae (Crustacea: Decapoda: Brachyura) new to the Ogasawara Islands, Japan
Fig. 3. A–B: Lophozozymus dodone (Herbst), ♀ (NSMT-Cr 31530; cb 8.6×cl 6.0 mm) from Hyotan-jima (A), ♂ (NSMT-Cr 31532; cb 15.6×cl 10.4 mm) from Haha-jima (B). C–D: Lophozozymus pulcheles Milne-Edwards, ♂ (NSMT-Cr 31534; cb 6.8×cl 4.5 mm) from Katsuodori-jima (C), ♀ (NSMT-Cr 31533; cb 11.9×cl 6.8 mm) from Mukou-jima (D). E: Metaxanthops acutus Serène, ♂ (NSMT-Cr 31536; cb 7.7×cl 5.4 mm) from Haha-jima. F: Mabui calculus Naruse, Maenosono and Ng, from Haha-jima. G: Platypodia anaglypta (Heller), ♂ (NSMT-Cr 31539; cb 12.5×cl 8.0 mm) from Miyano-hama, Chichi-jima. H: Tweedieia odhneri (Gordon), ♀ (NSMT-Cr 31548; cb 11.5×cl 8.4 mm) from Haha-jima.
Fig. 1 in A Rare Flatfish, Samaris spinea (Teleostei: Pleuronectiformes: Samaridae) from the Ogasawara Islands, Japan, with Notes on Its Distribution, Taxonomy and Sexual Dimorphism
Fig. 1. Map showing collection localities for specimens of Samaris spinea reported. Star, diamond and triangles: records for the present specimen, and those in Amaoka et al. (2004) and Mihara and Amaoka (2004), respectively.
Fig. 1 in Redescription of the specimen of Thrissina dussumieri (Teleostei: Clupeiformes: Engraulidae), collected from the Ogasawara Islands
Fig. 1. Preserved specimen of Thrissina dussumieri, USNM 86565, 87.6 mm SL, Ogasawara Islands, Japan.
Genetic diversity, structure, and demography of Pandanus boninensis(Pandanaceae) with sea drifted seeds, endemic to the Ogasawara Islands of Japan: Comparison between young and old islands
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Fig 7 in Two new species of the genus Omoplax (Hemiptera: Heteroptera: Tingidae) from Mukojima Island, with new records of lace bugs endemic to the Ogasawara Islands, Japan
Fig 7. Syntype of Omoplax desecta (Horváth, 1912) deposited in ELHU and its labels.
Fig. 7 in Two New Species of Aoridae from Chichijima Island, the Ogasawara Islands in Japan (Crustacea: Amphipoda)
Fig. 7. Grandidierella ogasawarensis sp. nov. Holotype, male (OMNH-Ar-12324), 5.0 mm. Habitus.
Fig. 4 in Two New Species of Aoridae from Chichijima Island, the Ogasawara Islands in Japan (Crustacea: Amphipoda)
Fig. 4. Aoroides macrops sp. nov. Holotype, male (OMNH-Ar-12315), 2.7 mm. Scales: 0.1 mm.
Fig. 2 in Two New Species of Aoridae from Chichijima Island, the Ogasawara Islands in Japan (Crustacea: Amphipoda)
Fig. 2. Aoroides macrops sp. nov. Holotype, male (OMNH-Ar-12315), 2.7 mm. Habitus.
Fig. 3 in Two New Species of Aoridae from Chichijima Island, the Ogasawara Islands in Japan (Crustacea: Amphipoda)
Fig. 3. Aoroides macrops sp. nov. Holotype, male (OMNH-Ar-12315), 2.7 mm. Scales: 0.05 mm.
Fig. 1. A, B in Crabs of the Families Tetraliidae, Trapeziidae and Xanthidae (Crustacea: Decapoda: Brachyura) new to the Ogasawara Islands, Japan
Fig. 1. A, B: Maps of the Chichi-jima and Haha-jima Islands showing the collecting sites (˔).
The oceanographic isolation of the Ogasawara Islands and genetic divergence in a reef-building coral
<p><strong><span>Aim:</span></strong><span> Due to their spatial isolation, oceanic islands are natural systems to study evolutionary divergence. The Ogasawara Islands belong to the most isolated archipelagos on Earth and are well-known for their high terrestrial endemicity, however, less is known about the marine realm. Here, we analyze the degree of oceanographic isolation of the archipelago based on genetic data of a reef-building coral and a biophysical dispersal model.</span></p> <p><strong><span>Location: </span></strong><span>North-Western Pacific (Ogasawara, Ryukyu, Daito Islands, Guam)</span></p> <p><strong><span>Taxon: </span></strong><em><span>Galaxea fascicularis </span></em><span>L.</span></p> <p><strong><span>Method:</span></strong><span> Three to 15 specimens were sampled at several sites in Ogasawara and its closest potential migration sources in southern Japan and the Mariana Islands (Guam) and RAD-sequenced. 108 specimens from the common Pacific lineages 'L' (Ryukyu- and Daito Islands, Guam) and 'Ogasawara' (Ogasawara) were analyzed with population genetics and demographic modeling<em>.</em> Oceanographic dispersal was investigated by inverse particle tracking using a Lagrangian particle advection simulation based on ROMS and applying biological dispersal parameters of <em>G. fascicularis</em>.</span></p> <p><strong><span>Results:</span></strong><span> The <em>G. fascicularis </em>population in Ogasawara is genetically highly differentiated from the next closest reefs in the region and has diverged from the Ryukyu Islands under very little, asymmetric, eastward migration. Inverse particle tracking confirmed the oceanographic isolation of Ogasawara and showed that the islands are rarely but most likely reached by settlers from the Ryukyu Islands by long-distance-dispersal of exceptionally long-lived larvae (>44 days), with no dispersal <em>vice versa</em>. </span></p> <p><strong><span>Main conclusions: </span></strong><span>Ogasawara is a dispersal sink location and t</span><span>he high degree of genetic differentiation in <em>Galaxea </em>has resulted from strong oceanographic isolation.</span> <span>This research highlights how oceanographic features impact species-level genetic differentiation even in well-dispersed taxa such as broadcast-spawning corals, and they are likely even more pronounced in less vagile organisms<em>.</em> These findings suggest the Ogasawaran Archipelago should be considered an important priority for marine conservation, alongside its high importance for terrestrial conservation. </span></p>
Data from: Genetic admixture and novel host shifts in a parasitic plant, Orobanche boninsimae (Orobanchaceae), endemic to the Ogasawara Islands
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The oceanographic isolation of the Ogasawara Islands and genetic divergence in a reef-building coral
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FIGURE 5. Bouvieraxius keiensis Sakai, 1992 in First record of Bouvieraxius keiensis Sakai, 1992 and Manaxius aurantiaca n. sp (Decapoda: Axiidea) from the waters around the Ogasawara Islands, Japan
FIGURE 5. Bouvieraxius keiensis Sakai, 1992, male (cl 7.1 mm), CBM-ZC 16167. A, ischium of maxilliped 3, upper view (setae omitted); B, right (major) chela, upper view (setae omitted); C, left (minor) chela, upper view (setae omitted); D, dactylus of pereopod 3, lateral view; E, distal part of propodus and dactylus of pereopod 4, lateral view (dactylus damaged at basal part); F, distal part of propodus and dactylus of left pereopod 5, lateral view; G, same, mesial view; H, left pleopod 1, anterior view; I, same, posterior view; J, left pleopod 2, mesial view; K, same, posterior view. Abbreviations: AI, appendix interna; AM, appendix masculina; EN, endopod; EX, exopod; PP, protopod.
FIGURE 2. Bouvieraxius keiensis Sakai, 1992 in First record of Bouvieraxius keiensis Sakai, 1992 and Manaxius aurantiaca n. sp (Decapoda: Axiidea) from the waters around the Ogasawara Islands, Japan
FIGURE 2. Bouvieraxius keiensis Sakai, 1992, male (cl 7.1 mm), CBM-ZC 16167. A, carapace and cephalic appendages, lateral view; B, same, dorsal view (setae omitted); C, rostrum, dorsal view; D, thoracic sternites 7 and 8 and coxae of pereopods 3–5, ventral view; E, pleon, telson and left uropod, lateral view; F, telson, dorsal view (setae omitted); G, article 1 of left antennular peduncle and left antennal peduncle, ventrolateral view; H, left uropod, dorsal view perpendicular to horizontal plane (setae omitted).
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