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Nemertean worms belonging to the genus  Carcinonemertes  have been tied to the collapse of crab fisheries in the northeastern Pacific Ocean. A new species is described from egg masses of two commercial crabs,  Cancer porteri  and  Romaleon setosum , inhabiting the central-north Chilean coast. This is the first species of  Carcinonemertes  described from the southeastern Pacific Ocean. Total body length of  Carcinonemertes camanchaco  sp. nov. ranged from 2.38 to 4.93 and from 4.29 to 8.92 mm, in males and females, respectively. Among others, traits that distinguish this new species from other previously described congeneric species include: presence of two gonad rows on each side of the intestine, a simple (not decorated) mucus sheath, and a relatively wide stylet basis. Maximum likelihood and Bayesian inference phylogenetic analyses distinguished this new species from all other species of  Carcinonemertes  with available  cox1  sequences in GenBank. Prevalence and mean (± SD) intensity of  C. camanchaco  sp. nov. was 24% and 2.6 (± 2.07) worms per egg mass in  C. porteri  and 38.1% and 3.8 (± 2.4) worms per egg mass in  R. setosum . The formal description of this new species represents the first step towards the understanding of this worm's impact on the health of crab fisheries in the southeastern Pacific Ocean.

First report of an egg-predator nemertean worm in crabs from the south-eastern Pacific coast: Carcinonemertes camanchaco sp. nov