Hemiurid Metacercariae (Trematoda) in Chaetognaths from the Mexican Caribbean Sea

摘要

Examination of coelomic cavities of 22,508 chaetognaths revealed the presence of 19 hemiurid metacercariae representing 3 genera as follows: Brachyphallus sp. from Serratosagitta serratodentata, Ectenurus sp. from Parasagitta friderici, and Lecithochirium sp. from Flacci-sagitta enflata, S. serratodentata, Sagitta bipunctata, and Sagitta helenae. Samples were collected along the Mexican coast of the Caribbean Sea from 50 m depth to surface during February, March, May, and August 1991. Overall prevalence and mean infection intensity were 0 084% and 1.0, respectively, Serratosagitta serratodentata and 5. helenae represent new host records for hemiurids.