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Articles

Extremely short embryonic period of the intertidal pulmonate limpet Siphonaria sirius (Pilsbry, 1895)

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Pages 235-242 | Received 09 Sep 2020, Published online: 27 Jun 2021
 

ABSTRACT

Siphonariidae is a panpulmonate family that occurs in intertidal rocky shores worldwide within temperate to tropical areas. Although the egg masses of Siphonaria sirius are commonly found in lower intertidal rocky shores in summer, there is a lack of information on their embryonic development. We examined the embryonic development and duration of S. sirius both in the laboratory and in the field. The study was conducted in Shirahama, Wakayama, Japan, during the summer of 2014 and 2015. The embryonic developmental process of S. sirius was similar to that of other planktotrophic siphonariids. However, S. sirius hatched within four days after oviposition at 27.35°C in the laboratory, which is the shortest in the Siphonariidae. In the field, hatching occurred notably faster at 1.6 days after oviposition, although the average temperature (27.42°C) was similar to that in the laboratory. The presence of egg predators, as well as other environmental factors, may be responsible for the short embryonic period of this species, especially in the field.

Acknowledgements

The authors thank Drs Keiji Iwasaki, Takashi Ida, Keiji Wada, Takuya Sato, So Ishida and two anonymous reviewers for their valuable comments, and lab members at Nara Women’s University, Kobe University, and Seto Marine Biological Laboratory of Kyoto University for their discussions and assistance.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by JSPS KAKENHI Grant Numbers 14J10996, 18J00175, 20K15874, 21J40093.

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