T. Akiyama

Publications46
h-index10
Citations370
Highly Influential Citations18
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Nemertean and phoronid genomes reveal lophotrochozoan evolution and the origin of bilaterian heads
Nemerteans (ribbon worms) and phoronids (horseshoe worms) are closely related lophotrochozoans—a group of animals including leeches, snails and other invertebrates. Lophotrochozoans represent a… Expand
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Quantitative changes in yolk protein and other components in the ovary and testis of the sea urchin Pseudocentrotus depressus
SUMMARY Both male and female sea urchins accumulate the major yolk protein (MYP; the most abundant yolk granule protein in sea urchin eggs) in the nutritive phagocytes of immature gonads before… Expand
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A Protein Identical to the Yolk Protein Is Stored in the Testis in Male Red Sea Urchin, Pseudocentrotus depressus.
Female sea urchins store the major yolk protein (MYP) in ovarian nutritive phagocytes before vitellogenesis. Using immunological procedures, we detected MYP in the testicular nutritive phagocytes of… Expand
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Two new species of Atlantocuma (Crustacea: Cumacea), and a new genus and species from Japan, Northwest Pacific, with observations on the degeneration of mouthparts in ovigerous females
Two species of the cumacean genus Atlantocuma from the southern coast of Honshu, Japan, 781–861 m depth, A. gamoi sp. nov. and A. ojii sp. nov., and Pseudopicrocuma japonicum gen et sp. nov. from… Expand
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Tidal Adaptation of a Circadian Clock Controlling a Crustacean Swimming Behavior
Abstract Cumacean Dimorphostylis asiatica exhibits an endogenous swimming rhythm, free-running period of which spontaneously changes from circa 12-hr to circa 24-hr in the laboratory. Administration… Expand
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The Tidal Rhythm of Emergence, and the Seasonal Variation of This Synchrony, in an Intertidal Midge.
The emergence of an intertial midge was investigated at a site on the coast of the Inland Sea of Japan. The population emerging at this site was drawn from a single species of the genus Clunio,… Expand
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Circatidal swimming activity rhythm in a subtidal cumacean Dimorphostylis asiatica (Crustacea)
Dimorphostylis asiatica, a cumacean crustacea inhabiting the sublittoral line of the Seto Inland Sea, shows a rhythmic pattern of swimming activity coinciding with daily and tidal components in the… Expand
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Description of a New Species of Cephalocarida, Sandersiella kikuchii, and Redescription of S. acuminata Shiino Based Upon the Type Material
Abstract A new species of cephalocarid, Sandersiella kikuchii, is described from central Japan, 300 m depth. It differs from congeners primarily based on the following points: 5-9 hooks on each… Expand
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Circatidal and Circadian Rhythms in Crustacean Swimming Behavior
Marine animals occasionally exhibit complicated temporal activity patterns, which are affected by both tidal and solar day cycles. The cumacean Dimorphostylis asiatica (Crustacea, Peracarida) swims… Expand
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Effect of Steroids on Gonadal Growth and Gametogenesis in the Juvenile Red Sea Urchin Pseudocentrotus depressus.
Red sea urchins, 10 months old, were fed for 30 days on a casein-based diet containing progesterone, androstenedione, testosterone, estrone, or estradiol-17{beta}. The mean gonad indices of male… Expand
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