1. Marine Biological Association The Laboratory Citadel Hill Plymouth PL1 2PB UK
2. Department of Biology and Marine Biology University of North Carolina Wilmington Wilmington NC 28403‐591 USA
3. Department of Plant and Environmental Sciences Weizmann Institute of Science Rehovot 7610001 Israel
4. Plymouth Electron Microscopy Centre University of Plymouth Plymouth PL4 8AA UK
5. FR2424 Sorbonne University / CNRS, Station Biologique de Roscoff Roscoff 29680 France
6. School of Ocean and Earth Science University of Southampton Southampton SO14 3ZH UK