Abstract
1 Marine Biological Association of the UK, Citadel Hill, Plymouth PL1 2DP, UK
2 School of Ocean Sciences, University of Wales Bangor, Menai Bridge, Anglesey LL59 5AB, UK
3 University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
4 Electron Microscope Unit, University of Cape Town, Private Bag, Rondebosch 7701, Cape Town, South Africa
5 School of Biological Science, University of Canterbury, Private Bag 4800, Christchurch, New Zealand