SELECTED PAPERS 



APPENDIX 



LIST OF GENERA INCLUDED IN THE TABLES 

 AND THEIR DIAGNOSIS* 



1. Tribe Spirilleae 



i. Thiospirillum Winogradsky, 1888. 



Spiral bacteria, motile by means of cephalotrichous flagella. No endospores 

 formed. Photo-autotrophic, containing a red to purple pigment complex. Nor- 

 mally reducing carbon dioxide with the simultaneous oxidation of H 2 S or other 

 inorganic sulfur compounds. 

 The type species is Thiospirillum sanguineum (Ehrenberg) Winogradsky. 



2. Phaeospirillum nov. gen. 



Spiral bacteria, motile by means of cephalotrichous flagella. No endospores 

 formed. Photo-heterotrophic, containing a brown pigment complex. 

 The type species to be assigned in the near future. 



3. Rhodospirillum Molisch, 1907. 



Spiral bacteria, motile by means of cephalotrichous flagella. No endospores 

 formed. Photo-heterotrophic, containing a red to purple pigment complex. 

 The type species is Rhodospirillum rubrum (Esmarch) Molisch. 



4. Sulfospirillum nov. gen. Syn. : Thiospira Wislouch, 191 4. 



Spiral bacteria, motile by means of cephalotrichous flagella. No endospores 

 formed. Chemo-autotrophic, oxidizing H.,S or other inorganic sulfur com- 

 pounds. 

 The type species is Sulfospirillum winogradskyi (Omelianski). 



5. Spirillum Ehrenberg, 1830. 



Spiral bacteria, motile by means of cephalotrichous flagella. No endospores 



formed. Chemo-heterotrophic, oxidizing various organic compounds. Gram 



negative. 



The type species is Spirillum undula (Midler) Ehrenberg. 



* Although the diagnoses of those genera which have been retained from earlier 

 systems of classification have nearly all been subject to more or less considerable 

 amendments, we have indicated this only explicitly by the suffix 'Emend.' in those 

 cases in which the amendment introduced involved the elimination of well established 

 species from the genus. 



Secondly it has to be emphasized that the following generic diagnoses have pur- 

 posely been kept broad, although they might, in most cases, well have been elaborat- 

 ed on the basis of the available information concerning the representatives described 

 until now. We have refrained from this in order to permit the future incorporation 

 of species which deviate in minor respects from the collectivity now included in the 

 genus, but which, nevertheless, show the morphological features of the tribe, and the 

 katabolic activity deemed characteristic of the genus. 



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