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Chromosome numbers of gammarids

Published online by Cambridge University Press:  11 May 2009

A. J. E. Orian  and
H. G. Callan
A. J. E. Orian
Affiliation:
Department of Natural History, The University, St Andrews
H. G. Callan
Affiliation:
Department of Natural History, The University, St Andrews
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Extract

The chromosomes of nine species of gammarids have been studied in oocytes and embryos. There is no evidence that polyploidy has played a part in gammarid evolution. Three of the species which we have studied, Gammarus pulex (L.), Marinogammarus marinus (Leach) and M. pirloti (Sexton & Spooner) show chromosomal polymorphism. There is no evidence that this polymorphism depends on the existence of a Robertsonian ‘fragmentationfusion’ system; rather it appears to be due to the presence of supernumerary chromosomes.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 36 , Issue 1 , February 1957 , pp. 129 - 142
Copyright
Copyright © Marine Biological Association of the United Kingdom 1957

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