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The possible presence of egg predators in brood masses of portunid crabs from Pacific Central America has not been studied yet. This survey reports the finding of a nemertean crab egg predator on the portunid crab,    Callinectes   arcuatus   , from the Golfo de Nicoya, Pacific Costa Rica. Nemerteans were found in the egg masses of 26 out of the 74 crabs for a prevalence of 35%. The intensity (mean number of worms/ infected crab) was estimated to be 18 with a variance of 1–123 worms/infected crab. No nemerteans were observed either in the 19    C.   arcuatus    from Golfo Dulce (southern Pacific coast) and the 10    Portunus   asper    from Herradura-Jaco (central Pacific coast). This nemertean is a member of the genus    Carcinonemertes   , which has been reported from the Caribbean coast of Panama. However, the encountered    Carcinonemertes    sp. is the first published finding and report from Costa Rica and Pacific Central America.

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Preliminary survey of a nemertean crab egg predator,    Carcinonemertes   , on its host crab,    Callinectes   arcuatus    (  Decapoda  ,   Portunidae  ) from Golfo de Nicoya, Pacific Costa Rica