RECENT TAXONOMIC CHANGES FOR ANAEROBIC GRAM-POSITIVE AND SELECTED GRAM-NEGATIVE ORGANISMS

The strains formerly classified as Streptococcus anginosus or ''Strept ococcus milleri'' have now been recognized as three distinct species, Streptococcus anginosus, Streptococcus constellatus, and Streptococcus intermedius. Streptococcus morbillorum has been transferred into the genus Gemella. Four new species within the genus Peptostreptococcus we re recently named. A recent addition to the genus Clostridium is Clost ridium argentinense, which includes Clostridium botulinum type G. Two new species of Actinomyces have been introduced: Actinomyces georgiae and Actinomyces gerencseriae. Arachnia propionica was shown to be rela ted to propionibacteria and has been renamed Propionibacterium propion icum. Eubacterium yurii was named to contain ''test-tube brush'' bacte ria found in subgingival plaque. Lactobacillus uli and Lactobacillus r imae are obligately anaerobic lactobacilli found in periodontal pocket s. Bilophila is a new genus of gram-negative bacilli. Wolinella recta and Wolinella curva are now included in the genus Campylobacter. The t axonomic position of Mobiluncus, currently assigned to the family Bact eroidaceae, remains uncertain.