A5053263446- Aquatic Invertebrate Ecology and Behavior
- Invertebrate Taxonomy and Ecology
- Marine Biology and Ecology Research
- Parasite Biology and Host Interactions
- Leech Biology and Applications
- Freshwater macroinvertebrate diversity and ecology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Crustacean biology and ecology
- Geology and Paleoclimatology Research
- Environmental DNA in Biodiversity Studies
- Fish Ecology and Management Studies
- Marine Ecology and Invasive Species
- Polar Research and Ecology
- Cryospheric studies and observations
- Environmental Toxicology and Ecotoxicology
- Planarian Biology and Electrostimulation
- Mollusks and Parasites Studies
- Coastal wetland ecosystem dynamics
- Insect and Arachnid Ecology and Behavior
- Climate change and permafrost
- Helminth infection and control
- Isotope Analysis in Ecology
- Microbial Community Ecology and Physiology
- Lichen and fungal ecology
- Subterranean biodiversity and taxonomy
Hirosaki University
2015-2024
Kureha (Japan)
2008
Lake Biwa Museum
2007
Landscape Research Group
2006
Hokkaido University
1986-2005
Hatch (Canada)
2005
Hokkaido Museum
2005
Gunma Astronomical Observatory
2005
The University of Tokyo
2005
University of Toyama
2004
Seven species of the genus Aulodrilus (Annelida, Clitellata, Tubificinae) are studied, based on new material from Japan. dentosus sp. nov. is characterized as having tubular atrium, forked or bifid distal ends dorsal crotchets, but no genital chaetae, and A. aestivus crescent-shaped median male bursa, chaetae in bundles. Five other congeners redescribed: limnobius Bretscher, pluriseta (Piguet), pigueti Kowalewski, japonicus Yamaguchi, americanus Brinkhurst & Cook. Comparison taxonomic...
A subterranean species of pseudocrangonyctid amphipod, Pseudocrangonyx gudariensis Tomikawa & Sato, sp. n., is described from the spring-fed stream Gudari-numa in Hakkoda Mountains, Aomori Prefecture, northern Japan. morphologically similar to P. coreanus Uéno, 1966 and febras Sidorov, 2009 based on its relatively small body size, number articles rami pleopods, urosomite 1 without basal setae. However, distinguished those following characteristics: coreanus, antenna 2 female calceoli,...
Kahayandrilus tundaiensis gen. et sp. nov. is described from an oxbow lake in Central Kalimantan, Indonesia. Although the taxonomic affinities are unknown, genus differs other genera Tubificinae having ovoid atria with long ejaculatory duct uniform width, and large penes soft thick wall.
Distribution of two ecologically similar but usually spatially separate ectosymbionts, branchiobdellidans (Annelida) and scutariellids (Platyhelminthes), on atyid shrimp (Neocaridina spp.) is reported from 18 localities in five Provinces southeastern China. Prevalence was determined for the branchiobdellidan, Holtodrilus truncatus, found at seven locations, scutariellid, Scutariella japonica, present every site, where cohabitation occurred. Both ectosymbionts showed a microhabitat...
Cirrodrilus makinoi (Yamaguchi, 1934) has not been identified since it was originally described from the Japanese crayfish, Cambaroides japonicus (De Haan, 1841) on Hokkaido Island, northern Japan. A critical morphological comparison of original and new material C. with those closely related tsugarensis Gelder Ohtaka, 2000, Honshu reveals there are no differentiating character to separate two species. molecular study using mitochondrial cytochrome c oxidase subunit I gene supports this view,...
The North American invasive signal crayfish Pacifastacus leniusculus was designated as an ‘Invasive Alien Species’ by the Ministry of Environment Japan and Agriculture, Forestry Fisheries on 1 February 2006. We report first record P. from Kanto region (Chiba Prefecture), central Japan. Adult specimens were collected Tone River basin between September 2009 January 2010. Ectosymbiotic worms (Annelida, Clitellata, Branchiobdellidae) found all identified Sathodrilus attenuatus, which outside its...
On the basis of newly collected specimens, 35 taxa aquatic Oligochaeta are listed from Lake Biwa, central Japan, with synonymy lists and some taxonomic remarks. The list covers all species previously recorded lake, is composed one lumbriculid, 19 naidids, 14 tubificids biwadrilid. Among them, Vejdovskyella (V.) simplex, Teneridrilus mastix Aulodrilus limnobius new to Japan. In addition Uncinais uncinata, Specaria josinae, Ophidonais serpentina, Branchiodrilus hortensis japonicus Biwa....
Two North American ectosymbionts, a cambarincolid branchiobdellidan, Cambarincola mesochoreus, and an entocytherid ostracod, Ankylocythere sinuosa, were recorded for the first time in Japan, on red swamp crayfish, Procambarus clarkii, from urban stream Tokyo. Although immediate origin of hosts ectosymbionts is unknown, it highly probable that they recently imported into Japan. A single C. mesochoreus was also found alien atyid shrimp, Neocaridina davidi, same as infected Pr. clarkii. This...
A new species of Phreodrilidae is described from Lake Biwa, Japan, using classical morphology and a 658 bp long fragment the mitochondrial cytochrome c oxidase subunit I (COI) gene as potential "DNA barcode". Astacopsidrilus ryuteki sp. nov. unusual in possessing dorsal bundles each represented by only single seta, instead usual hair support setae. Among other phreodrilids, this feature has been reported Nesodrilus isochaeta Pinder Brinkhurst, 1997 Insulodrilus bifidus 1997, both Australia....
Cirrodrilus japonicus (Pierantoni, 1912) has not been identified since it was originally described from specimens removed preserved Japanese crayfish that had deposited in the Natural History Museum Hamburg, Germany. A morphological comparison of published description and recently discovered syntypes C. Hamburg with newly collected material ezoensis (Yamaguchi, 1934), supported view preservation artifacts caused Prof. Yamaguchi to believe his well-preserved were member a separate species....
Twelve species of Cirrodrilus, a genus ectosymbiotic branchiobdellidans, have been recorded on the Japanese crayfish, Cambaroides japonicus, from islands Hokkaido and northern Honshu. To clarify geographic distribution these species, we examined branchiobdellidan assemblages 71 locations 59 We found 11 morphologically distinct species. The following 8 species: Cirrodrilus digitatus, Ci. cirratus, uchidai, sapporensis, nipponicus, megalodentatus homodontus were exclusively Hokkaido, while...