In a vestigial manner.

simple past tense and past participle of vestigialize

Converted to vestigial form

To convert to a vestigial form

Conversion to vestigial form

Of or pertaining to a vestige or remnant; like a trace from the past. / Not fully developed in mature animals.

(biology) A small, degenerate, or imperfectly developed part or organ which has been more fully developed in some past generation.

(evolutionary theory) The quality of being vestigial.

plural of vestigial

(obsolete) vestige