Echinochasmus spp

From Dog
Adult Echinochasmus schwartzi[1]

Echinochasmus are a parasitic digenetic fluke of dogs.

These echinostomatid trematodes are small (1 - 2 mm) slender worms with a collar of spines surrounding an oral sucker. [2]. Intermediate hosts include snails, bivalves, and fundulus fish, whereas the definitive hosts are mainly birds and mammals such as dogs[3].

Dogs become infected by eating infected fish containing infective metacercariae. Adults develop in the dog intestine and eggs are passed, which are eaten by copepods[4].

Species which have been reported in dogs include:

  • Echinochasmus schwartzi

Dogs are usually infected asymptomatically.

Treatment would be effective empirically with praziquantel, given at 5 mg/kg every 4 - 6 weeks.


  1. Price, EW (1931) Four new species of trematode worms. National Museum of natural history
  2. Bowman, DD (2009) Georgis' parasitology for veterinarians. 9th edn. Elsevier Saunders, Missouri. pp:322
  3. Huffman JE & Fried B (2012) The biology of Echinoparyphium (Trematoda, Echinostomatidae). Acta Parasitol 57(3):199-210
  4. Santiago Bass C & Weis JS (2009) Conspicuous behaviour of Fundulus heteroclitus associated with high digenean metacercariae gill abundances. J Fish Biol 74(4):763-772