The Caribbean Aquatic Animal Health Project and the Caribbean Stranding Network attempted to rehabilitate a moribund green turtle, an endangered marine species, from Puerto Rico. The animal died and a necropsy was performed in an attempt to determine the cause of death. Several species of digeneans were found: a single spirorchid, Learedius learedi; 2 pronocephalids, Pyelosomum cochelear and Glyphicephalus lobatus, recorded for the first time in green turtles of Puerto Rico; a single angiodictyid, Deuterobaris proteus, which represents a new locality record for the Caribbean; and 3 microscaphidiids, Angiodictyum parallelum and Octangium sagitta, which represent new locality records for the Caribbean and Atlantic Ocean, respectively, and Polyangium linguatula, a new locality record for Puerto Rico.