2931 



STUDIES ON MYXOSPORJDIA—KUDO 



55 



Suborder n Cystosporea Davis 

 Family 1 Myxosomidae* Davis 

 • Genus 1 Myxosoma 



Genus 2 Lentospora 

 Family 2 Myxobolidae 



Genus 1 Myxobolus • 



Genus 2 Henneguya 

 Genus 3 Hoferellus 



Thus, Davis selected the form of the spore for the establishment of two 

 suborders and further rearranged the genera into closer positions to show 

 relationship to each other better than any one of the previous authors. 

 He, however, named the suborders according to a secondary character, 

 i.e., the seat of the parasites in the host. According to his definition the 

 trophozoites of the species belonging to Myxosporea are "with few excep- 

 tions free living in the body-cavity," while those of Cystosporea "with 

 few exceptions" are tissue parasites. 



From TABLE III on page 45, are taken the following data regarding 

 this point: 



Total nimiber 



of species 



known 



Number of 



species found in 



body cavity 



Number of 



species found in 



tissue 



Number of 



species found in 



both places 



Seat 

 unknown 



M)ntosporea. 

 Cystosporea. 



132 

 105 



114 



7 



14 



95 



Thus it appears that the terms Myxosporea and Cystosporea do not 

 seem to be properly used. These may be replaced by terms that denote 

 the first and common character of the suborders. 



The suggestions as to the adoption of other characters than the spore 

 for the divisions of Myxosporidia, proposed by Awerinzew (1907:831; 

 1908:64), Auerbach (1910:161) and Davis (1917:217) can only be applied 

 in the future. At the present time, the characters concerning the vegetative 

 form do not appear to afford a better and more natural basis for the 

 classification of Myxosporidia than those of the spore. Thus from the 

 taxonomic point of view the present situation does not seem to be much 

 improved as compared with that at the end of the last century. 



The writer proposes in the following pages a new classification based on 

 the characters of the spore. 



* Davis did not notice the establishment of the family Myxosomatidae by F. Poche (1913), 

 including exactly the same genera. See page 54. 



