<p>Derivative work of <a href="//commons.wikimedia.org/wiki/File:Haeckel_Prosobranchia.jpg" title="File:Haeckel Prosobranchia.jpg">Haeckel Prosobranchia.jpg</a> (PD)
This version (by <a href="//commons.wikimedia.org/wiki/User:Pengo" title="User:Pengo">Pengo</a>) released as PD too.
</p>
Used only as a key for the original image.
No machine-readable author provided. <a href="//commons.wikimedia.org/wiki/User:Pengo" title="User:Pengo">Pengo</a> assumed (based on copyright claims).
13 March 2006 (original upload date)
No machine-readable source provided. Own work assumed (based on copyright claims).