1. Department of Biological Sciences; Clemson University; 132 Long Hall Clemson South Carolina 29634 USA
2. Smithsonian Marine Station at Fort Pierce; 701 Seaway Drive Fort Pierce Florida 34949 USA
3. Departamento de Biología Marina; Facultad de Ciencias del Mar; Universidad Católica del Norte; Larrondo 1281 Coquimbo Chile
4. Department of Biology; University of Louisiana at Lafayette; P.O. Box 42451 Lafayette Louisiana USA
5. Coastal Branch of Natural History Museum and Institute; Chiba, 123 Yoshio, Katsuura Chiba 299-5242 Japan
6. Centro de Estudios Avanzados en Zonas Aridas CEAZA; Coquimbo Chile