 Santagata thinks "Phoronis architecta" is a different species from both "Phoronis psammophila" and "Phoronis muelleri", and that "[the phoronids'] species diversity is currently underestimated".In 2009 Temereva described what may be larvae of "Phoronopsis albomaculata" and "Phoronopsis californica".She wrote that, while there are 12 undisputed adult phoronid species, 25 morphological types of larvae have been identified.