12 ILLINOIS BIOLOGICAL MONOGRAPHS [222 



Part I BIOLOGY 



THE HOSTS INFECTED 



Gregarines infect only invertebrates and they have been reported 

 from the following phyla : Coelenterata, Echinodermata, Platyhelmin- 

 thes, Coelhelminthes (Archianellidse, Gephyrea, Hirudinea, Annelida 

 Polycheeta and Oligochaeta), Arthropoda, (Crustacea, Onycophora, My- 

 riapoda, Hexapoda, and Arachnida), MoUusca and Chordata (Enter- 

 opneusta and Tunieata). Thus far the only groups below the verte- 

 brates from which gregarines have not been reported are the phyla Roti- 

 fera, Porifera, and Protozoa, and the sub-phylum Leptocardii. 



Partial List of Animals Examined for Gregarines 

 Number examined Number parasitized 



o 

 o 



2 



6 

 o 



2 

 20 

 25 



o 

 o 

 o 



