Summary of findings by authors who observed monorchiid (a) and gymnophallid (b) life stages in coquina Donax variabilis, barring Cercaria pocillator and Cercaria fragosa, which we did not encounter and were only speculated to encyst in D. variabilis by Holliman [29]. (A) previous studies; (B) Current study showing that both Donax fossor and D. variabilis may act as second intermediate host, but D. fossor is the sole first intermediate host on the Atlantic coast. The fish image was provided by the Freshwater and Marine Image Bank https://digitalcollections.lib.washington.edu/digital/collection/fishimages/search.