A5058169606- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Marine Biology and Ecology Research
- Evolution and Paleontology Studies
- Geological and Geophysical Studies
- Geological and Geochemical Analysis
- Paleontology and Evolutionary Biology
- Geological formations and processes
- Methane Hydrates and Related Phenomena
- Marine and environmental studies
- Isotope Analysis in Ecology
- earthquake and tectonic studies
- Subterranean biodiversity and taxonomy
- Cephalopods and Marine Biology
- Geochemistry and Geologic Mapping
- Marine and coastal plant biology
- Fish biology, ecology, and behavior
- Plant Diversity and Evolution
- Plant and animal studies
- Neurobiology and Insect Physiology Research
- Fossil Insects in Amber
- Maritime and Coastal Archaeology
- Crustacean biology and ecology
- Ichthyology and Marine Biology
- Insect and Arachnid Ecology and Behavior
Kumamoto University
2014-2024
Kanazawa University
2003-2020
Shanghai Science and Technology Museum
2018
Japan Agency for Marine-Earth Science and Technology
2013-2015
Gunma Museum of Natural History
2008-2013
American Museum of Natural History
2008-2013
Kyoto University
2006-2009
Shizuoka University
2005-2006
The Furongian Orsten-type fossil Lagerstatte in the Alum Shale Formation of Sweden is an extraordinary deposit known for its detailed, three-dimensional preservation soft parts small animal carcasses which have been replaced by calcium phosphate and occur organic-rich nodular limestone. exact cause mechanism this unusual preservation, however, particularly source phosphorus, plays a key role, remains unknown. Detailed observation Agnostus pisiformis Zone Backeborg section (Kinnekulle...
In Rikuzentakata City, Ostracode assemblages in sediment deposited by the Tohoku‐Oki earthquake and tsunami of 11 March 2011 revealed that was derived from seafloor at least 9 m water depth, transported inland more than 1 km. The wave height this location higher 10 m. Four hundred fifty seven modern ostracode were used analogue technique to estimate depth source assemblages. application method paleo‐tsunami deposits may provide insight into past potentially slip magnitude.
We report on Recent podocopid ostracods from the northern coast of Vietnam, describe two new ostracod species (Loxoconcha vietnamensis and Caudites huyeni), appendages Loxoconcha ocellata Ho 1982. identified 75 15 surface-sediment samples recognized three biofacies (I, II, III) based salinity ranges. Among these, II commonly occurs in marine to brackishwaters over a wide range salinity. The assemblages northeastern Vietnam shows strong connection with fauna China.
The exceptionally preserved eyes of an Eocene dolichopodid fly contained in Baltic amber show remarkable detail, including features at micrometre and submicrometre levels. Based on this material, we establish that it is likely the neural superposition compound eye existed as far back 45 Ma. ommatidia have open rhabdom with a trapezoidal arrangement seven rhabdomeres. Such structure uniquely characteristic present-day flies. Optical analysis reveals fossil had sophisticated efficient optical system.
Compound eyes are common in decapod crustaceans. Decapods have an abundant post-Palaeozoic fossil record, but hitherto morphological information about their has been mainly restricted to Recent material. Here we report the discovery of compound recovered from acetic acid residues two fish-bearing nodules Cretaceous Santana Formation Brazil; they include what identified as larval eyes. The comparable phyllosoma because following characters: hemispherical visual surface on a stalked eye;...
Shell outlines of 202 extant cytheroidean ostracods were analysed in dorsal, lateral, and posterior views by elliptic Fourier analysis. The results obtained confirm that the exterior morphology is related to ecological factors as well phylogenetic constraints. Phytal species living on tall seagrass benthic burrowing sediments are characterized differentiated from crawling presence slender shells with tapered venters. With reference reconstruction ancestral state outline traits molecular...
Here we report the first detailed reconstruction of eye and visual system a Paleozoic ostracod, namely dimorphic primitiopsid (Palaeocopa) Primitiopsis planifrons Jones, 1887. Evidence from cuticular lens morphology its position on valve suggests that P. had naupliar eye, which is most common optical in crustaceans. characters such as separated each strongly calcified nature diameter, are concordant with some Recent podocopid ostracods divided type present. Ray tracing reconstructed species...
Research Article| February 01, 2010 Original structural color preserved in an ancient leaf beetle Gengo Tanaka; Tanaka * 1Gunma Museum of Natural History, 1674-1, Kamikuroiwa, Tomioka, Gunma 370-2345, Japan *E-mail: tanaka@gmnh.pref.gunma.jp. Search for other works by this author on: GSW Google Scholar Hideki Taniguchi; Taniguchi 2Oita Industrial Institute, 4361-10, Takae-nishi 1, Oita 870-1117, Haruyoshi Maeda; Maeda 3Department Geology and Mineralogy, Kyoto University, Kitashirakawa...
An almost intact specimen of an uppermost Cretaceous heteromorph ammonoid, Pravitoceras sigmoidale Yabe, was recently discovered from the Hakobuchi Formation Yezo Supergroup in Hidaka area, Hokkaido. The is preserved a lenticular calcareous nodule. It retains two whorls planispiral phragmocone and succeeding retroversal hook, which associated with lower jaw apparatus near aperture. P. occurs within Inoceramus shikotanensis Zone at section. Patagiosites alaskensis, Gaudryceras sp.,...
Forty-seven sediment samples were taken from a borehole core at Oppama Park, Yokosuka City, Kanagawa Prefecture, central Japan. Fifty-eight ostracod species, representing 32 genera, identified in the samples. Three biofacies (I–III) using Q-mode cluster analysis. On basis of biofacies, following paleoenvironmental changes recognized study area: land mudflat (no ostracods) → muddy bottom environment inner bay (biofacies III) sandy near rocky shore II) shallow I). Modern analog technique (MAT)...
Abstract Mesozoic, Cenozoic and especially Holocene ostracod faunas have been documented from Japan. Not surprisingly, considering the plate tectonic factors at play, very few are known its early Paleozoic successions. Our pilot studies recovered new assemblages terranes of Acid preparation carbonates has yielded low diversity, poorly preserved yet significant palaeocopid podocopid Wenlock/Ludlow Series Silurian rocks Gionyama in Kurosegawa Terrane, Miyazaki Prefecture, Kyushu, Hitoegane...
Abstract Six major groups of trilobites from the Silurian and Devonian Japan are evaluated for their paleobiogeographical signature. illaenids scutelluids show four generic‐level at least two species‐level links with Australian segment Gondwana paleocontinent; encrinurids also indicate Australia South China whilst phacopids, possibly proetids, suggest North paleocontinent. These different patterns may reflect fragmentary biostratigraphical record Japanese trilobites, but they appear to...
The optical features of lateral ocelli the eye were examined in 29 Recent species major ostracod group Podocopida using a theoretical morphological model. A cuticular lens-tapetum model was used for this purpose. Ray tracing simulated on each order to assess light-gathering abilities various forms eyes. results computer simulations and morphospace analyses indicated that ability is dominantly affected by thickness curvature outer surface lens. On basis combination form ability, four types...