1. Department of Marine Sciences, University of Puerto Rico, PO Box 9013, Mayagüez, PR 00681, USA.
2. Department of Public Health Science, Parasitology Section, University of Rome La Sapienza, P. le Aldo Moro, 5, 00185, Roma, Italy.
3. Department of Ecology and Sustainable Economic Development, Tuscia University, Via S. Giovanni Decollato, 1, 01100, Viterbo, Italy.
4. Moss Landing Marine Laboratories, 8272 Moss Landing Road, Moss Landing, CA 95039-9647, USA.
5. Puerto Rico Manatee Conservation Center, Inter American University of Puerto Rico, PO Box 361615, San Juan, PR 00936, USA.