Cryptocotyle spp

From Dog
Adult Cryptocotyle intestinal fluke

Cryptocotyle spp are a non-pathogenic intestinal fluke parasite of dogs in USA, Canada, Japan, Siberia, and Europe.

Pathogenic species in dogs include:

  • Cryptocotyle lingua[1]

The life cycle of this parasite includes snails as first intermediate hosts and fish (usually flounder) as second intermediate host, where as an ectoparasite, they cause black spot disease[2]. Dogs become infected from eating fish that contain encysted metacercariae[3].

Diagnosis is based on coprological identification of Cryptocotyle eggs[4].

Treatment of this parasite in dogs is relatively effective with praziquantel.


  1. Cross MA et al (2005) Effects of host habitat quality on the viability of Cryptocotyle lingua (Trematoda: Digenea) cercariae. Parasitology 130(2):195-201
  2. Khan RA (2006) Assessment of stress-related bioindicators in winter flounder (Pleuronectes americanus) exposed to discharges from a pulp and paper mill in Newfoundland: a 5-year field study. Arch Environ Contam Toxicol 51(1):103-110
  3. Landis SH et al (2012) PLoS One 7(1):e30658
  4. Saeed I et al (2006) Helminths of red foxes (Vulpes vulpes) in Denmark. Vet Parasitol 139(1-3):168-179