Retigyra millipunctata is a species of sea snail, a marine gastropod mollusk, unassigned in the family Seguenzioidea.

Lissotesta major is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea.

Lissotesta ambigua is a species of very small sea snail, a marine gastropod mollusc, unassigned in the superfamily Seguenzioidea.

When it is uncertain how to classify a species into a genus but its classification in a family is clear, it will be classified as an unassigned species of that family.

There are also a number of unassigned species and genera.

Lissotesta micra, common name the tiny false top shell, is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea.

Beyond these groupings, the tree appeared conservative in the sense that the unassigned bacterial species formed separate branches near the root of the bacterial subtree.