New records, hosts, and SEM observations of Cercaria owreae (Hutton, 1954)from the Mexican Caribbean Sea

Digenetic trematode larvae identified as Cercaria owreae (Hutton) were reco rded in the coela of the following chaetognath species: Flaccisagitta enfla ta (Grassi), Serratosagitta serratodentata (Krohn), Ferosagitta hispida (Co nant), and Sagitta helenae Ritter-Zahony. The hosts and parasites were coll ected during 4 oceanographic cruises in February, March, May, and August 19 91. The low prevalence of infection (average 0.11%) was comparable with pre vious records. The intensity was restricted to 1 parasite. Ferosagitta hisp ida and Sagitta helenae are recorded for the first time as hosts of Cercari a owreae, and the Mexican Caribbean Sea is reported as a new locality for t he geographical distribution of this parasite.