S. Ohtsuka

Publications233
h-index26
Citations2,429
Highly Influential Citations184
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Sem Observation of the Nauplius of Monstrilla Hamatapex, New Species, from Japan and an Example of Upgraded Descriptive Standards for Monstrilloid Copepods
TLDR
First-instar larvae were hatched from eggs borne by a female Monstrilla hamatapex, new species, from inshore plankton in Tanabe Bay, Honshu, Japan, and the naupliar appendages are less oligomerous and bear more setae than previously reported. Expand
A new genus of monstrilloid copepods (Crustacea) with anteriorly pointing ovigerous spines and related adaptations for subthoracic brooding
TLDR
Maemonstrilla gen. nov., known exclusively from females, is proposed for Monstrilla longipes, and the first known instance of subthoracic brooding in a planktonic copepod is discussed; its functional significance is discussed, and brooding habits of non-planktonicCopepods are briefly reviewed. Expand
Symbionts of marine medusae and ctenophores
TLDR
Previously published data on symbionts on these gelatinous predators are reviewed and new information is introduced in the form of unpub- lished data about symbiotic apostome ciliates, anthozoan larvae and hyperiid amphipods. Expand
Sexual dimorphism in calanoid copepods: morphology and function
TLDR
It is suggested that the loss of the antennulary geniculation in many non-centropagoidean calanoids has evolved in response to increasing predator pressure imposed on pairs in amplexus. Expand
Species of the parasitic genus Duboscquella are members of the enigmatic Marine Alveolate Group I.
Small subunit ribosomal RNA gene sequences of Duboscquella spp. infecting the tintinnid ciliate, Favella ehrenbergii, were determined. Two parasites were sampled from different localities. They are… Expand
Introduction of the Asian copepods Acartiella sinensis, Tortanus dextrilobatus (Copepoda : Calanoida), and Limnoithona tetraspina (Copepoda : Cyclopoida) to the San Francisco Estuary, California, USA
Ectoparasitic Isopod, Norileca indica (Crustacea, Isopoda, Cymothoidae), Obtained from the Stomach of Coryphaena hippurus (Perciformes, Coryphaenidae) in the Philippines
Norileca indica (Milne-Edwards, 1840)(甲殻綱, 等脚目, ウオノエ科)は東南アジアとモザンビーク沖に分布し, さまざまな遠洋性魚類(Alepes apercna Grant, Atule malam (Bleeker), メアジSelar crumenophthalmus (Bloch), Rastelliger kanagurta (Cuvier),… Expand
Development and polyp formation of the giant box jellyfish Morbakka virulenta (Kishinouye, 1910) (Cnidaria: Cubozoa) collected from the Seto Inland Sea, western Japan
TLDR
The giant cubozoan Morbakka virulenta was collected from the central part of the Seto Inland Sea, west- ern Japan in October 2009, in order to observe its development and polyp formation and may shed additional light on the evolution of life history strategies in the Cnidaria. Expand
Calanoid copepods collected from the near-bottom in Tanabe Bay on the Pacific coast of the middle Honshu, Japan. II. Arietellidae (cont.).
Monodisc strobilation in Japanese giant box jellyfish Morbakka virulenta (Kishinouye, 1910): a strong implication of phylogenetic similarity between Cubozoa and Scyphozoa
TLDR
The unique medusa production of M. virulenta highly implies a phylogenetic similarity between cubozoans and scyphozoans. Expand
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