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Karyotypic analysis of the hermaphroditic viviparous polychaete, Hediste limnicola (Polychaeta: Nereididae): possibility of sex chromosome degeneration

Published online by Cambridge University Press:  10 August 2009

Hiroaki Tosuji ,
Kotaro Togami  and
Junko Miyamoto
Hiroaki Tosuji*
Affiliation:
Department of Chemistry and Bioscience, Graduate School of Science and Engineering, Kagoshima University, Korimoto, Kagoshima, 890-0065Japan
Kotaro Togami
Affiliation:
Department of Earth and Environmental Sciences, Faculty of Science, Kagoshima University, Korimoto, Kagoshima, 890-0065Japan
Junko Miyamoto
Affiliation:
Department of Earth and Environmental Sciences, Graduate School of Science and Engineering, Kagoshima University, Korimoto, Kagoshima, 890-0065Japan
*
Correspondence should be addressed to: H. Tosuji, Department of Chemistry and Bioscience, Graduate School of Science and Engineering, Kagoshima University, Korimoto, Kagoshima, 890-0065Japan email: [email protected]
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Abstract

Karyotypes of the hermaphroditic polychaete Hediste limnicola were examined using an air-drying method and genetic material prepared from regenerating tail and newborn juveniles. Materials were obtained from a lineage of cultured worms originating from Watsonville Slough (California, USA) and maintained for six years in the laboratory. Giemsa-stained preparations were analysed by a computer-assisted image-analysing system for the identification of each chromosome pair. A diploid chromosome number of 26 was obtained from well-spread metaphase chromosomes of mitotic cells, consisting of metacentric (N = 11), submetacentric (N = 1) and telocentric (N = 1) chromosomes. It is possible that hermaphroditism in this species evolved through loss of a pair of sex chromosomes, which are present in closely related congeneric species.

Keywords

AnnelidaNereididaeHedisteimage-analysing methodchromosomekaryotypesex chromosomeshermaphroditism
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 90 , Issue 3 , May 2010 , pp. 613 - 616
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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