1. Department of Coastal Sciences, Gulf Coast Research Laboratory University of Southern Mississippi 703 East Beach Drive Ocean Springs MS 39564 U.S.A.
2. South African Institute for Aquatic Biodiversity (SAIAB) Private Bag 1015 Grahamstown 6140 South Africa
3. Department of Zoology Nelson Mandela Metropolitan University P. O. Box 77000 Port Elizabeth 6031 South Africa