some examples of facultatively anaerobic bacteria are "staphylococcus" spp., "streptococcus" spp., "escherichia coli", "salmonella", "listeria" spp., "shewanella oneidensis" and "yersinia pestis". certain eukaryotes are also facultative anaerobes, including fungi such as "saccharomyces cerevisiae" and many aquatic invertebrates such as nereid (worm) polychaetes.