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Volume 48 (1989)
- Issue 4 Pages 207-
- Issue 3 Pages 141-
- Issue 2 Pages 61-
- Issue 1 Pages 1-
Volume 48, Issue 1
Displaying 1-7 of 7 articles from this issue
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Frank R. BERNARDArticle type: Article
1989 Volume 48 Issue 1 Pages 1-11
Published: March 31, 1989
Released on J-STAGE: January 31, 2018
JOURNAL FREE ACCESSThe genera and subgenera of the living Periplomatidae of the Pacific and Indo-Pacific regions are reviewed. The genus Periploma contains Periploma (s.s.), Cricoploma subgen. nov. and Septentrioploma subgen. nov. Four more genera, namely, Albimanus, Halistrepta, Offadesma and Takashia gen. nov. are recognized in these regions.View full abstractDownload PDF (1128K) -
Kikutaro BABAArticle type: Article
1989 Volume 48 Issue 1 Pages 12-20
Published: March 31, 1989
Released on J-STAGE: January 31, 2018
JOURNAL FREE ACCESS(1) Glossodoris multituberculata Baba, 1953 is moved to the genus Mexichromis Bertsch, 1977, and is re-described. (2) Mexichromis festiva (Angas, 1864), previously noted to occur in Japan, is more extensively described.View full abstractDownload PDF (578K) -
Kikutaro BABAArticle type: Article
1989 Volume 48 Issue 1 Pages 21-26
Published: March 31, 1989
Released on J-STAGE: January 31, 2018
JOURNAL FREE ACCESSTwo species of the genus Chromodoris, C. aureopurpurea Colling-wood, 1881 and C. collingwoodi Rudman, 1987 are described. The latter species is newly recorded from Japan.View full abstractDownload PDF (459K) -
Yasuo KONDOArticle type: Article
1989 Volume 48 Issue 1 Pages 27-39
Published: March 31, 1989
Released on J-STAGE: January 31, 2018
JOURNAL FREE ACCESSFour box core samples containing many living individuals of an arcoid bivalve Limopsis tajimae Sowerby were collected at depths of about 280 m in the northeastern part of Suruga Bay, Central Japan. The bivalve was observed to lie on one valve, either right or left, just beneath the sediment surface. The posture is common in limpsoids and glycymerididis, and is considered to be adapted to efficient suspension-feeding for non-siphonate bivalves having equivalve, compressed sheel. The population density is high, ranging from 40 to 480 individuals/m^2 among these box cores. Cross-sectional observation on one of the core samples suggests that the large population of L. tajimae in Suruga Bay was formed very recently and most of the early inhabitants are still living. The similar fossil aggregations of L. tajimae are found in the deposit of ancient Suruga Bay, the Late Pleistocene Negoya Formation, Shizuoka Prefecture. Comparative observation indicates that the modern and ancient examples of dense aggregation of L. tajimae resemble each other in water depth, geomorphic feature, and other environmental settings.View full abstractDownload PDF (936K) -
Takaki KONDOArticle type: Article
1989 Volume 48 Issue 1 Pages 40-45
Published: March 31, 1989
Released on J-STAGE: January 31, 2018
JOURNAL FREE ACCESSClutch size (number of eggs in the marsupia) and hosts of glochidia were examined for 5 summer breeders and 3 winter breeders of Japanese unionid mussels. Clutch size was smaller in the summer breeder than in the winter breeder, when the size of glochidia was similar. Most glochidia of summer breeder left the nonhost fish within 1 day after attachment, which suggests that they can select the proper host. The reduction of reproductive cost by acquirement of the ability of host recognition may allow the summer breeder to grow and breed at the same time. On the other hand, winter breeder may produce more eggs to compensate the little probability of coming into contact with fish due to the low fish activity in winter.View full abstractDownload PDF (393K) -
Kenji TORIGOEArticle type: Article
1989 Volume 48 Issue 1 Pages 46-49
Published: March 31, 1989
Released on J-STAGE: January 31, 2018
JOURNAL FREE ACCESS -
[in Japanese]Article type: Article
1989 Volume 48 Issue 1 Pages 50-
Published: March 31, 1989
Released on J-STAGE: January 31, 2018
JOURNAL FREE ACCESSDownload PDF (153K)
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