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Growth and reproductive cycle of Hypermastus tokunagai (Caenogastropoda: Eulimidae), an ectoparasite of the sand dollar Scaphechinus mirabilis (Clypeasteroida: Scutellidae) in the Seto Inland Sea, Japan

Published online by Cambridge University Press:  19 October 2012

Haruna Matsuda ,
Tatsuo Hamano  and
Kazuya Nagasawa
Haruna Matsuda*
Affiliation:
Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan
Tatsuo Hamano
Affiliation:
Department of Applied Aquabiology, National Fisheries University, 2-7-1 Nagata-Honmachi, Shimonoseki, Yamaguchi 759-6595, Japan
Kazuya Nagasawa
Affiliation:
Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8528, Japan
*
Correspondence should be addressed to: H. Matsuda, Institute of Socio-Arts and Sciences, The University of Tokushima, 1-1 Minamijyosanjima-cho, Tokushima, Tokushima 770-8502, Japan email: hypermastus@gmail.com
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Abstract

Hypermastus tokunagai is a eulimid gastropod infecting the sand dollar Scaphechinus mirabilis. The eulimid is easily detached from the host and thus regarded as a temporary parasite. In this study, the growth and reproductive cycle of H. tokunagai were investigated using specimens collected from S. mirabilis in the western Seto Inland Sea, Japan. Newly recruited individuals of H. tokunagai appeared in early autumn and grew rapidly, while growth was retarded from mid-autumn to winter months. A second rapid growth occurred the following summer. Based on the growth pattern, the life span of H. tokunagai was estimated to be more than 20 months. This longer life span compared to other eulimids could be due to the accessibility and population stability of its host S. mirabilis. Maturation of H. tokunagai occurred within a short period in the summer, and was synchronized with the second growth phase. Hypermastus tokunagai showed size dimorphism between sexes and an investigation on change in shell shape with growth revealed that this characteristic can be attributed to the female's acquisition of a larger shell within a short time during its maturation period.

Keywords

Eulimidaegrowth patternparasitic snailreproductive cyclesand dollar

Information

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Issue 4 , June 2013 , pp. 1041 - 1051
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012 

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