CNIDOSPORIDIA, MYXOSPORIDIA, ACTINOMYXIDIA 311 



Family 3 Myxosomatidae Poche 



Genus Myxosoma Thelohan. The spore ovoidal, flattened 

 and more or less elongated. Two polar capsules. Histozoic 

 parasites in freshwater and marine fishes. Several species. 



Myxosoma catostomi Kudo (Figs. 28; 128; 129, c). In the 

 muscle and connective tissue of the body of the sucker, Cato- 

 stonius commersonii. The spore measures 13 to 15 microns by 

 10 to 11.5 microns. 



Genus Lentospora Plehn. The spore circular to oval in front 

 view. Two polar capsules. Histozoic parasites. Several species. 



Lentospora cerehralis (Hofer) (Fig. 133, a, b). In the cartilage 

 and perichondrium of the salmonoid fishes. Young fishes are 

 especially affected by the infection. The disease is known as the 



Fig. 133 a,b. Lentospora cerehralis. X400 (After Plehn). a, trophozoite; 

 b, five spores in different views. 



c. A spore of Agarella gracilis. X830 (After Dunkerley). 



d. Two views of a spore of Myxobolus notatus. X765. (After Kudo), 

 e-g. Myxobolus pfeifferi. e, part of section of a cyst; f, a spore 



treated with Lugol's solution (X890 after Keysselitz); g, a fresh 

 spore (X500 after Thelohan). 

 h, i. M. orhiculatiis. (After Kudo), h, a fresh spore and one treated 

 with Lugol's solution (X500) ; i, infected host muscle (X300). 

 j. Spores of M. conspicuus. X765 (After Kudo), 

 k. A spore of Henneguya psorospermica. X665 (After Thelohan). 

 1-n. H. mictospora. (After Kudo). 1, m, two spores in life (X665); 

 a stained monosporous trophozoite (X565). 



"twist-disease" (Drehkrankheit). The spore is 6 to 10 microns 

 in diameter. 



Genus Agarella Dunkerly. The spore is elongated oval. Four 

 polar capsules at the anterior end. Shell is prolonged posteriorly 

 into long processes. One species. 



