Studies on Hermaphroditism of the Ovoviviparous Pulmonate, Euphaedusa tau (Bottger) : I Shell Whorls as a Growth Parameter
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- OHTSUKI Midori
- Department of Biology, Faculty of Science, Nara Women's College
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- TAKAHASHI Sohji
- Department of Biology, Faculty of Science, Nara Women's College
Bibliographic Information
- Other Title
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- 卵胎生有肺類ナミコギセルガイの雌雄同体現象の研究 : I 成長指標としての螺層階数
- 卵胎性有肺類ナルコギセルガイの雌雄同体現象の研究-1-成長指標としての螺層階数
- ランタイセイ ユウ ハイ ルイ ナルコギセルガイ ノ シユウ ドウタイ ゲンシ
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Abstract
Euphaedusa tau (Bottger)(Stylommatophora, Clausiliidae) is a hermaphroditic and ovoviviparous snail. As the first step for studies on the hermaphroditism, we attempted to establish a practical method for determining the growth stages of this species. On the assumption that the number of shell whorls is a useful growth parameter, we made the following observations. Snails were obtained from the campus of Nara Women's College at Nara City five times at various seasons of 1978 and 1979. Growth of the snail was divided into eight stages according to the number of shell whorls. The stages were named in order of increasing in number of the whorls as Stage 3, 4, -, 9 and 10, respectively. The shell height and breadth were measured in all specimens collected. Snails at the same stage were almost same in height and breadth. The seasonal fluctuations of the values were very small. Therefore, the expression of the growth stage by means of the number of shell whorls will facilitate a precise approach to the future study on the hermaphroditism of this species and make it easy to collect some batches of animals all at the same stage from samples without laborious sorting. Spermatogenesis occurred in some snails at Stage 7, and he percentage of snails with spermatozoa in the ovotestis increased at more advanced stages. Most of the snails with embryos and/or young snails in the oviduct were found in those at Stage 10. It means that in a population of Euphedusa tau, the Stage 10, which produces youngs, directly involves in reproductive activity to sustain the popula ion.
Journal
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- Venus (Japanese Journal of Malacology)
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Venus (Japanese Journal of Malacology) 41 (2), 141-145, 1982
The Malacological Society of Japan
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Details 詳細情報について
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- CRID
- 1390001204352771968
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- NII Article ID
- 110004764377
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- NII Book ID
- AN00410236
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- ISSN
- 24329967
- 00423580
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- NDL BIB ID
- 2455882
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed