vahlkampfia avara vahlkampfia avara vahlkampfia avara is a species of excavates. it has a pas-positive surface layer and forms cysts in culture. vahlkampfia avara scientific classification domain: eukaryota phylum: percolozoa class: heterolobosea order: schizopyrenida family: vahlkampfiidae genus: vahlkampfia species: v. avara binomial name vahlkampfia avarapage, 1967