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Quarterly Journal of Microscopical Science, Vol s3-101, 395-400, Copyright © 1960 by Company of Biologists

The Chromosome Numbers and Nuclear Cytology of Some Common British Serpulids

S. DASGUPTA 1 and A. P. AUSTIN 1

1 Marine Biology Station, Menai Bridge, Anglesey)

The chromosome numbers of Hydroides norvegica, Mercierella enigmatica, and Pomatoceros triqueter were determined from squashes of somatic cells in young embryos obtained by artificial fertilization, and stained with iron-alum/aceto-carmine. All had a diploid count of zn = 26 chromosomes. Mitotic and meiotic divisions in the 5 species of Spirorbis examined, and in Filograna implexa, all revealed a diploid chromosome number of 2n = 20. A diploid chromosome number of 14 is suggested for the ancestral serpulid.






© The Company of Biologists Ltd 1960